{ "category": "Date and time functions", "display_name": "NETWORKDAYS.INTL", "entry_kind": "built_in_function", "eval_api": { "method": "POST", "url": "https://handbook.dnacalc.com/api/eval" }, "function_id": "FUNC.NETWORKDAYS.INTL", "implementation_state": { "answer_bank": { "excel_builds": [ "20430" ], "larger_numeric": 0, "last_bit": 0, "matched": 3600, "other_mismatch": 0, "refused": 0, "rows": 3600, "unread": 0, "worst_ulp": 0 }, "detail": "Recorded: 3,600 in the answer bank and 21 workbook cells.", "dnacalc_commit": "9e1884369a678158dd82d3d74188daf986995e87", "in_catalogue": true, "state": "matches", "state_label": "Matches every recorded Excel answer", "summary": "Matches all 3,621 recorded answers", "workbook_corpus": { "cells": 21, "matched": 21 } }, "implementations": [ { "commit": "9e1884369a678158dd82d3d74188daf986995e87", "flavour": "excel-compatibility-candidate", "language": "Rust", "name": "CalcFunc", "own_code": [ "https://github.com/DnaCalc/DnaCalc/blob/9e1884369a678158dd82d3d74188daf986995e87/crates/calc-func/src/catalogue/dates.rs#L328-L330" ], "repository": "https://github.com/DnaCalc/DnaCalc", "shared_code": [ "catalogue/dates::environment", "catalogue/dates::system", "catalogue/dates::to_1900", "catalogue/dates::from_1900", "catalogue/dates::present_num", "catalogue/dates::serial_out", "catalogue/dates::weekend", "catalogue/dates::holidays", "catalogue/dates::workday", "catalogue/dates::networkdays", "ported/date_kernels::days", "ported/date_kernels::weekday_sunday_one_based", "ported/date_kernels::WeekendMask::saturday_sunday", "ported/date_kernels::WeekendMask::from_number", "ported/date_kernels::WeekendMask::from_mask_text", "ported/date_kernels::WeekendMask::is_all_days", "ported/date_kernels::WeekendMask::contains_serial", "ported/date_kernels::serial_from_number", "ported/date_kernels::is_business_day", "ported/date_kernels::workday", "ported/date_kernels::networkdays" ], "source": "https://github.com/DnaCalc/DnaCalc/blob/9e1884369a678158dd82d3d74188daf986995e87/crates/calc-func/src/catalogue/dates.rs#L328-L330", "state": "matches", "suite": null, "summary": "Matches all 3,621 recorded answers" } ], "json_url": "https://handbook.dnacalc.com/api/functions/FUNC.NETWORKDAYS.INTL.json", "name": "NETWORKDAYS.INTL", "notes": [ { "basis": "19 NETWORKDAYS.INTL and 20 WORKDAY.INTL readings with errors held in cells, and the logical weekend readings of the argument sheets.", "documentation": null, "evidence": [ { "commit": "287c5b9a3bec81ea96f12ad485f18a0d4b729063", "locator": "delivered_scalar_readings_follow_the_application_route", "note": "recorded answers pinned", "path": "apps/dna-onecalc/tests/acceptance.rs", "repository": "DnaCalc" }, { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": null, "note": "19 recorded readings", "path": "crates/calc-func/tests/captures/fn4_questions/NETWORKDAYS.INTL.reading.json", "repository": "DnaCalc" }, { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": null, "note": "20 recorded readings", "path": "crates/calc-func/tests/captures/fn4_questions/WORKDAY.INTL.reading.json", "repository": "DnaCalc" } ], "functions": [ "FUNC.NETWORKDAYS.INTL", "FUNC.WORKDAY.INTL" ], "inferred": null, "kind": "quirk", "note_id": "FN-NETWORKDAYS.INTL-001", "open": [], "recorded_on": "2026-11-04", "repros": [ { "call": "NETWORKDAYS.INTL(A1, 5, 0)", "correct": null, "excel": { "bits": null, "display": "#NUM!", "kind": "error" }, "input_route": "cell-value2", "inputs": [ { "name": "start_date", "value": { "bits": null, "display": "#REF!", "kind": "error" } }, { "name": "end_date", "value": { "bits": "0x4014000000000000", "display": "5", "kind": "number" } }, { "name": "weekend", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } } ], "recorded_in": "Excel 16.0.20527.20088, Windows, bitness and CPU not recorded in this reading file", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "fn7-NETWORKDAYS.INTL-weekend-first-order-2", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/NETWORKDAYS.INTL.reading.json", "repository": "DnaCalc" } }, { "call": "WORKDAY.INTL(A1, 5, 0)", "correct": null, "excel": { "bits": null, "display": "#REF!", "kind": "error" }, "input_route": "cell-value2", "inputs": [ { "name": "start_date", "value": { "bits": null, "display": "#REF!", "kind": "error" } }, { "name": "days", "value": { "bits": "0x4014000000000000", "display": "5", "kind": "number" } }, { "name": "weekend", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } } ], "recorded_in": "Excel 16.0.20527.20088, Windows, bitness and CPU not recorded in this reading file", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "fn7-WORKDAY.INTL-weekend-first-order-2", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/WORKDAY.INTL.reading.json", "repository": "DnaCalc" } }, { "call": "NETWORKDAYS.INTL(2, 5, A3)", "correct": null, "excel": { "bits": null, "display": "#VALUE!", "kind": "error" }, "input_route": "cell-value2", "inputs": [ { "name": "start_date", "value": { "bits": "0x4000000000000000", "display": "2", "kind": "number" } }, { "name": "end_date", "value": { "bits": "0x4014000000000000", "display": "5", "kind": "number" } }, { "name": "weekend", "value": { "bits": null, "display": "#REF!", "kind": "error" } } ], "recorded_in": "Excel 16.0.20527.20088, Windows, bitness and CPU not recorded in this reading file", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "fn7-NETWORKDAYS.INTL-admission-order-6", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/NETWORKDAYS.INTL.reading.json", "repository": "DnaCalc" } }, { "call": "WORKDAY.INTL(2, 5, A3)", "correct": null, "excel": { "bits": null, "display": "#NUM!", "kind": "error" }, "input_route": "cell-value2", "inputs": [ { "name": "start_date", "value": { "bits": "0x4000000000000000", "display": "2", "kind": "number" } }, { "name": "days", "value": { "bits": "0x4014000000000000", "display": "5", "kind": "number" } }, { "name": "weekend", "value": { "bits": null, "display": "#REF!", "kind": "error" } } ], "recorded_in": "Excel 16.0.20527.20088, Windows, bitness and CPU not recorded in this reading file", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "fn7-WORKDAY.INTL-admission-order-6", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/WORKDAY.INTL.reading.json", "repository": "DnaCalc" } }, { "call": "=NETWORKDAYS.INTL(2,5,TRUE)", "correct": null, "excel": { "bits": "0x4010000000000000", "display": "4", "kind": "number" }, "input_route": "formula-literal", "inputs": [], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qa043, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-arguments.capture.json", "repository": "DnaCalc" } }, { "call": "=NETWORKDAYS.INTL(2,5,FALSE)", "correct": null, "excel": { "bits": null, "display": "#NUM!", "kind": "error" }, "input_route": "formula-literal", "inputs": [], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qa044, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-arguments.capture.json", "repository": "DnaCalc" } }, { "call": "=WORKDAY.INTL(2,2,TRUE)", "correct": null, "excel": { "bits": "0x4010000000000000", "display": "4", "kind": "number" }, "input_route": "formula-literal", "inputs": [], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qa065, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-arguments.capture.json", "repository": "DnaCalc" } }, { "call": "=WORKDAY.INTL(2,2,FALSE)", "correct": null, "excel": { "bits": null, "display": "#NUM!", "kind": "error" }, "input_route": "formula-literal", "inputs": [], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qa066, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-arguments.capture.json", "repository": "DnaCalc" } } ], "schema": "efh.function-note/v1", "statement": "The two functions read their arguments in different orders. NETWORKDAYS.INTL decodes weekend first: with #REF! in the cell for start_date and weekend 0, the answer is #NUM!, from the invalid weekend. WORKDAY.INTL reads start_date first and gives #REF! for the same arguments. An error held in the weekend cell is also treated differently: with start 2 and second argument 5, NETWORKDAYS.INTL gives #VALUE! and WORKDAY.INTL gives #NUM!. Neither returns the error itself. A logical weekend is read as a number: NETWORKDAYS.INTL(2,5,TRUE) is 4, as with weekend 1, and FALSE is #NUM!, as with weekend 0. WORKDAY.INTL does the same.", "status": "measured", "title": "NETWORKDAYS.INTL checks weekend before the dates, WORKDAY.INTL after them" }, { "basis": "8 recorded readings with an empty B1, one per function, each paired with a reading with TRUE in B1.", "documentation": null, "evidence": [ { "commit": "c4c5dde7e2dcf735d2849835fc49769e2ab67ba7", "locator": "delivered_fn4_blank_date_references_read_serial_zero", "note": "recorded answers pinned", "path": "apps/dna-onecalc/tests/acceptance.rs", "repository": "DnaCalc" }, { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheets qa031 and qa032, and the like pairs of each function", "note": "recorded readings", "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-arguments.capture.json", "repository": "DnaCalc" } ], "functions": [ "FUNC.NETWORKDAYS", "FUNC.NETWORKDAYS.INTL", "FUNC.TBILLEQ", "FUNC.TBILLPRICE", "FUNC.TBILLYIELD", "FUNC.WORKDAY", "FUNC.WORKDAY.INTL", "FUNC.YEARFRAC" ], "inferred": null, "kind": "quirk", "note_id": "FN-WORKDAY-001", "open": [ "An argument left empty in the call was not read here for YEARFRAC and the T-bill functions." ], "recorded_on": "2026-11-04", "repros": [ { "call": "=NETWORKDAYS(B1,5)", "correct": null, "excel": { "bits": "0x4010000000000000", "display": "4", "kind": "number" }, "input_route": "cell-value2", "inputs": [ { "name": "B1", "value": { "bits": null, "display": "(empty cell)", "kind": "blank" } } ], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qa032, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-arguments.capture.json", "repository": "DnaCalc" } }, { "call": "=NETWORKDAYS(B1,5)", "correct": null, "excel": { "bits": null, "display": "#VALUE!", "kind": "error" }, "input_route": "cell-value2", "inputs": [ { "name": "B1", "value": { "bits": null, "display": "TRUE", "kind": "logical" } } ], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qa031, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-arguments.capture.json", "repository": "DnaCalc" } }, { "call": "=WORKDAY(B1,2)", "correct": null, "excel": { "bits": "0x4008000000000000", "display": "3", "kind": "number" }, "input_route": "cell-value2", "inputs": [ { "name": "B1", "value": { "bits": null, "display": "(empty cell)", "kind": "blank" } } ], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qa054, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-arguments.capture.json", "repository": "DnaCalc" } }, { "call": "=WORKDAY(B1,2)", "correct": null, "excel": { "bits": null, "display": "#VALUE!", "kind": "error" }, "input_route": "cell-value2", "inputs": [ { "name": "B1", "value": { "bits": null, "display": "TRUE", "kind": "logical" } } ], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qa053, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-arguments.capture.json", "repository": "DnaCalc" } }, { "call": "=NETWORKDAYS.INTL(B1,5,1)", "correct": null, "excel": { "bits": "0x4010000000000000", "display": "4", "kind": "number" }, "input_route": "cell-value2", "inputs": [ { "name": "B1", "value": { "bits": null, "display": "(empty cell)", "kind": "blank" } } ], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qa040, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-arguments.capture.json", "repository": "DnaCalc" } }, { "call": "=WORKDAY.INTL(B1,2,1)", "correct": null, "excel": { "bits": "0x4008000000000000", "display": "3", "kind": "number" }, "input_route": "cell-value2", "inputs": [ { "name": "B1", "value": { "bits": null, "display": "(empty cell)", "kind": "blank" } } ], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qa062, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-arguments.capture.json", "repository": "DnaCalc" } }, { "call": "=YEARFRAC(B1,5,0)", "correct": null, "excel": { "bits": "0x3f8c71c71c71c71c", "display": "0.013888888888888888", "kind": "number" }, "input_route": "cell-value2", "inputs": [ { "name": "B1", "value": { "bits": null, "display": "(empty cell)", "kind": "blank" } } ], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qa072, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-arguments.capture.json", "repository": "DnaCalc" } }, { "call": "=TBILLEQ(B1,5,0.1)", "correct": null, "excel": { "bits": "0x3fb9fddd1b6a757f", "display": "0.10152990264255911", "kind": "number" }, "input_route": "cell-value2", "inputs": [ { "name": "B1", "value": { "bits": null, "display": "(empty cell)", "kind": "blank" } } ], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qa082, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-arguments.capture.json", "repository": "DnaCalc" } } ], "schema": "efh.function-note/v1", "statement": "A reference to an empty cell as the first date of these functions reads as serial 0 and gives a normal answer: NETWORKDAYS(B1,5) is 4 and WORKDAY(B1,2) is 3. YEARFRAC(B1,5,0) is 5/360. TRUE in the same cell gives #VALUE!, as a direct TRUE does, so a blank is not treated as the logical FALSE either.", "status": "measured", "title": "An empty cell as a first date is serial 0, but a logical in that cell is #VALUE!" } ], "schema": "efh.function-reference/v1", "section_order": [ "what-it-does", "try-it", "quirks", "how-to-implement", "version-differences", "alternatives" ], "sections": { "alternatives": "\n### Relationships\n\n\n- **[NETWORKDAYS](FUNC.NETWORKDAYS.md)** — the un-generalized original. `NETWORKDAYS(a,b,h)` should\n equal `NETWORKDAYS.INTL(a,b,1,h)`; that equivalence is unverified here and is the family's\n cleanest cross-check.\n- **[WORKDAY.INTL](FUNC.WORKDAY.INTL.md)** — the inverse operation with the identical `weekend`\n argument. The two should agree about which days are weekends by construction, but their errors\n do not match: the documented tables are worded differently, and FN-NETWORKDAYS.INTL-001 measures\n different answers for errors in the date and weekend cells.\n- **[WORKDAY](FUNC.WORKDAY.md)** — the un-generalized inverse.\n- **[WEEKDAY](FUNC.WEEKDAY.md)** — the underlying day-of-week notion, with yet another numbering\n convention. This family contains four mutually non-aligned weekday numberings: `WEEKDAY`'s\n legacy codes, `WEEKDAY`'s 11–17 block, `.INTL`'s 1–7 pairs, and `.INTL`'s Monday-first string.\n That is a genuine design fact about the surface and the source of most `.INTL` bugs.\n\n\n", "how-to-implement": "\n### Notes for implementers\n\n\n1. **Normalize `weekend` to a seven-bit mask first**, from either the numeric code or the string,\n and reject invalid inputs at that point. Every downstream step then sees one representation.\n2. **Get the Monday-first string convention right**, and write a test that fails if the mask is\n reversed — a reversed mask is symmetric for the common `\"0000011\"`/`\"1100000\"` confusion only in\n the sense that both look plausible.\n3. **Use whole-week arithmetic, not enumeration.** With a mask, the count over `n` whole weeks is\n `n × popcount(¬mask)`, and only the partial week at each end needs a loop of at most six\n iterations. Enumeration over a century-scale interval is reachable and slow.\n4. **Decide the all-weekend (`\"1111111\"`) policy deliberately** and keep it consistent with\n `WORKDAY.INTL`, where the documentation is explicit that the string is invalid.\n5. **Do not accept a numeric `weekend` that happens to look like a mask.** `11` is a table code, not\n a two-day pattern.\n\n\n", "quirks": "\n### Result and edge cases\n\n\nReturns a `Number`: a count of working days.\n\n- **Inclusivity of the endpoints** is not stated on the Microsoft page, exactly as with\n `NETWORKDAYS`. The expected behaviour is that both endpoints count, and\n `NETWORKDAYS.INTL(2,5,TRUE)` = 4 fits it (FN-NETWORKDAYS.INTL-001).\n- **Reversed intervals** — likewise undocumented and unverified.\n- **A weekend covering six days** leaves one working day per week and is legal.\n- **Holidays landing on weekend days** should contribute nothing, since the operation is exclusion;\n undocumented.\n- **Blank cells in a `holidays` range** raise the Empty-versus-Missing question from\n [the value universe](../model/01-value-universe.md), and serial 0 is inside the representable\n range — so a blank interpreted as a number is a date. Undocumented and a real hazard.\n\n\n\n### Errors\n\n\nAs documented on the Microsoft page:\n\n- `#NUM!` when `start_date` or `end_date` is out of the valid date range.\n- `#VALUE!` when \"a weekend string is of invalid length or contains invalid characters\".\n\nCompare [NETWORKDAYS](FUNC.NETWORKDAYS.md), whose page documents `#VALUE!` \"if any argument is not a\nvalid date\" — a different error value for what looks like the same failure. The Handbook records\nthe discrepancy rather than resolving it by assumption; see\n[claim language](../model/06-claim-language.md), rule 5.\n\nThe documented `#VALUE!` condition names only *string* invalidity. What an out-of-table **numeric**\nweekend code does is not stated on that page. Code 0 gives `#NUM!` (FN-NETWORKDAYS.INTL-001); 8, 10\nand 18 are not asserted here.\n\n\n", "sources": "\n- Microsoft 365 support, **NETWORKDAYS.INTL function** —\n .\n Source of the weekend number table, the weekend string rules quoted above, and both documented\n error conditions.\n- Microsoft 365 support, **WORKDAY.INTL function** —\n .\n Source of the \"at least one workday required\" statement about `\"1111111\"`.\n- Microsoft 365 support, **NETWORKDAYS function** —\n .\n Cited for the contrasting error condition.\n- Handbook call-model chapters [01 value universe](../model/01-value-universe.md) and\n [06 claim language](../model/06-claim-language.md).\n- `data/functions/FUNC.NETWORKDAYS.INTL.json`, `data/presence/FUNC.NETWORKDAYS.INTL.json`,\n `data/battery/FUNC.NETWORKDAYS.INTL.json`.\n\n", "version-differences": "The recorded environments below distinguish a reading from a same-input comparison. Counts describe captured inputs in each environment; overlapping captures and comparisons are not totals of unique worksheet calls.\n\n| Excel 16.0 build | Platform and CPU | Captured inputs |\n|---|---|---:|\n| 20430 | Windows, 64-bit, AMD Ryzen 7 4800H with Radeon Graphics | 2,400 |\n\nThe record contains no same-input comparison between these environments. Reading different inputs on different builds does not establish either a version change or cross-build agreement.\n\n[Recorded environments and comparison details](https://github.com/DnaCalc/ExcelFunctionsHandbook/blob/5dc75391aa5125ccc5abdb095da85950980d6fd8/content/evidence/environments/FUNC.NETWORKDAYS.INTL.json).", "what-it-does": "\n`NETWORKDAYS.INTL` counts the whole working days in the interval from `start_date` to `end_date`,\nexcluding days designated as weekend and any dates listed in `holidays`. It differs from\n[NETWORKDAYS](FUNC.NETWORKDAYS.md) in exactly one respect: **the weekend is an argument**, not a\nconstant, and it can name any subset of the week.\n\nThat single change is what makes the function usable outside the Saturday/Sunday world — Friday–\nSaturday weekends, single-day weekends, six-day working weeks, and (via the string form)\narbitrary patterns such as \"Wednesday and Sunday off\".\n\nThe count itself is the same filtered enumeration: take the days of the interval, drop the ones\nwhose weekday is designated weekend, drop the ones in `holidays`, return the remainder.\n\n\n\n### Arguments\n\n\n`NETWORKDAYS.INTL(start_date, end_date, [weekend], [holidays])` — two required and two optional.\n\n**start_date**, **end_date** — the interval endpoints, as date serials.\n\n**weekend** — optional. Two entirely different value shapes are accepted, and they are the reason\nthis function needs a page.\n\n*As a number*, the documented table is:\n\n| Number | Weekend days |\n|---|---|\n| 1 or omitted | Saturday, Sunday |\n| 2 | Sunday, Monday |\n| 3 | Monday, Tuesday |\n| 4 | Tuesday, Wednesday |\n| 5 | Wednesday, Thursday |\n| 6 | Thursday, Friday |\n| 7 | Friday, Saturday |\n| 11 | Sunday only |\n| 12 | Monday only |\n| 13 | Tuesday only |\n| 14 | Wednesday only |\n| 15 | Thursday only |\n| 16 | Friday only |\n| 17 | Saturday only |\n\nThe two blocks have different generators, which is the trap. Codes **1–7** name *consecutive\npairs*, and the pair for code `n` begins on the day `n` positions after Friday — code 1 is\nSaturday+Sunday, code 2 is Sunday+Monday, and so on around the week. Codes **11–17** name *single\ndays*, running Sunday (11) through Saturday (17). There is no code for a non-consecutive pair; for\nthat you need the string form. Note also that the single-day block starts at Sunday while the\npair block starts at Saturday, so neither block's numbering aligns with the other's, nor with\n[WEEKDAY](FUNC.WEEKDAY.md)'s `return_type` numbering. Nothing about these tables is memorable, and\nguessing is unwise.\n\n*As a string*, Microsoft documents: \"Weekend string values are seven characters long and each\ncharacter in the string represents a day of the week, starting with Monday.\" Each character is\n`\"1\"` for a non-workday or `\"0\"` for a workday, and \"only the characters 1 and 0 are permitted in\nthe string\". So `\"0000011\"` is the ordinary Saturday/Sunday weekend, and `\"0100010\"` is Tuesday and\nSaturday off.\n\nThree details about the string form:\n\n- **It starts with Monday**, which is not the convention any of this function's numeric tables use\n and not the convention `WEEKDAY`'s default `return_type` uses.\n- **`\"1111111\"` is invalid** — the [WORKDAY.INTL](FUNC.WORKDAY.INTL.md) page states the rule\n explicitly (\"at least one workday required\"), and the same argument is shared by both functions.\n Whether `NETWORKDAYS.INTL` rejects it identically is a natural check that has not been run here;\n a zero-workday week would make the count trivially 0 rather than undefined, so the two functions\n could defensibly differ.\n- **It is text, not a number.** A `weekend` of `0000011` written without quotes is the number 11,\n which is a valid *numeric* code meaning \"Sunday only\" — a silent, plausible-looking wrong answer\n rather than an error. This is the sharpest foot-gun in the function.\n\n**holidays** — optional range or array of dates to exclude, as on\n[NETWORKDAYS](FUNC.NETWORKDAYS.md).\n\n\n" }, "signature": { "display": "NETWORKDAYS.INTL(start_date, end_date, [weekend], [holidays])", "parameters": [ { "description": null, "name": "start_date", "optional": false, "repeats": false }, { "description": null, "name": "end_date", "optional": false, "repeats": false }, { "description": null, "name": "weekend", "optional": true, "repeats": false }, { "description": null, "name": "holidays", "optional": true, "repeats": false } ], "trailing_repeats": false }, "sources": { "metadata": { "admission": { "label": "implemented", "reason": null }, "arity": { "max": 4, "min": 2 }, "category": "Date and time functions", "classification": { "arg_preparation_profile": "ValuesOnlyPreAdapter", "coercion_lift_profile": "Custom", "determinism_class": "Deterministic", "error_collapse_profile": "None", "fec_dependency_profile": "None", "host_interaction_class": "None", "kernel_signature_class": "Custom", "rich_value_usage": "RichBlind", "surface_fec_dependency_profile": "RefOnly", "thread_safety_class": "SafePure", "volatility_class": "NonVolatile" }, "descriptions": { "long": null, "short": "Working days between two dates with a chosen weekend and listed holidays", "short_source": "dna-calc-own" }, "docs": { "english_description": "Returns the number of whole workdays between two dates using parameters to indicate which and how many days are weekend days", "microsoft_url": "https://support.microsoft.com/en-us/office/networkdays-intl-function-a9b26239-4f20-46a1-9ab8-4e925bfd5e28" }, "entry_kind": "built_in_function", "localized_family_names": null, "localized_names": [ { "locale": "ar-SA", "name": "NETWORKDAYS.INTL" }, { "locale": "bg-BG", "name": "NETWORKDAYS.INTL" }, { "locale": "cs-CZ", "name": "NETWORKDAYS.INTL" }, { "locale": "da-DK", "name": "ANTAL.ARBEJDSDAGE.INTL" }, { "locale": "de-DE", "name": "NETWORKDAYS.INTL" }, { "locale": "el-GR", "name": "NETWORKDAYS.INTL" }, { "locale": "en-AU", "name": "NETWORKDAYS.INTL" }, { "locale": "en-GB", "name": "NETWORKDAYS.INTL" }, { "locale": "en-US", "name": "NETWORKDAYS.INTL" }, { "locale": "es-ES", "name": "DIAS.LAB.INTL" }, { "locale": "et-EE", "name": "NETWORKDAYS.INTL" }, { "locale": "fi-FI", "name": "TYÖPÄIVÄT.KANSVÄL" }, { "locale": "fr-FR", "name": "NB.JOURS.OUVRES.INTL*" }, { "locale": "he-IL", "name": "NETWORKDAYS.INTL" }, { "locale": "hr-HR", "name": "NETWORKDAYS.INTL" }, { "locale": "hu-HU", "name": "ÖSSZ.MUNKANAP.INTL" }, { "locale": "id-ID", "name": "NETWORKDAYS.INTL" }, { "locale": "it-IT", "name": "NETWORKDAYS.INTL" }, { "locale": "ja-JP", "name": "NETWORKDAYS.INTL" }, { "locale": "ko-KR", "name": "NETWORKDAYS.INTL" }, { "locale": "lt-LT", "name": "NETWORKDAYS.INTL" }, { "locale": "lv-LV", "name": "NETWORKDAYS.INTL" }, { "locale": "nb-NO", "name": "NETWORKDAYS.INTL" }, { "locale": "nl-NL", "name": "NETWERKDAGEN.INTL" }, { "locale": "pl-PL", "name": "DNI.ROBOCZE.NIESTAND" }, { "locale": "pt-BR", "name": "NETWORKDAYS.INTL" }, { "locale": "pt-PT", "name": "DIATRABALHOTOTAL.INTL" }, { "locale": "ro-RO", "name": "NETWORKDAYS.INTL" }, { "locale": "ru-RU", "name": "ЧИСТРАБДНИ.МЕЖД" }, { "locale": "sk-SK", "name": "NETWORKDAYS.INTL" }, { "locale": "sl-SI", "name": "NETWORKDAYS.INTL" }, { "locale": "sr-Latn-RS", "name": "NETWORKDAYS.INTL" }, { "locale": "sv-SE", "name": "NETTOARBETSDAGAR.INT" }, { "locale": "th-TH", "name": "NETWORKDAYS.INTL" }, { "locale": "tr-TR", "name": "TAMİŞGÜNÜ.ULUSL" }, { "locale": "uk-UA", "name": "NETWORKDAYS.INTL" }, { "locale": "vi-VN", "name": "NETWORKDAYS.INTL" }, { "locale": "zh-CN", "name": "NETWORKDAYS.INTL" }, { "locale": "zh-HK", "name": "NETWORKDAYS.INTL" }, { "locale": "zh-TW", "name": "NETWORKDAYS.INTL" } ], "signature": { "display": "NETWORKDAYS.INTL(start_date, end_date, [weekend], [holidays])", "parameters": [ { "description": null, "name": "start_date", "optional": false, "repeats": false }, { "description": null, "name": "end_date", "optional": false, "repeats": false }, { "description": null, "name": "weekend", "optional": true, "repeats": false }, { "description": null, "name": "holidays", "optional": true, "repeats": false } ], "trailing_repeats": false }, "surface_name": "NETWORKDAYS.INTL", "version_marker": null, "xlcall": { "code": "520", "symbol": "xlfNetworkdays_intl" } }, "microsoft": "https://support.microsoft.com/en-us/office/networkdays-intl-function-a9b26239-4f20-46a1-9ab8-4e925bfd5e28" }, "try_it": { "formula": "=NETWORKDAYS.INTL(DATE(2026,11,2),DATE(2026,11,6),1)" }, "url": "https://handbook.dnacalc.com/functions/NETWORKDAYS.INTL.html", "variants": [], "versions": [ { "behaviour": "NETWORKDAYS.INTL(A1, 5, 0) returned #NUM!. NETWORKDAYS.INTL(2, 5, A3) returned #VALUE!. Inputs were supplied through cells using Value2. These are controls from this environment, not a same-input comparison with another build.", "excel_build": "16.0.20527.20088", "observations": [ { "call": "NETWORKDAYS.INTL(A1, 5, 0)", "excel": { "bits": null, "display": "#NUM!", "kind": "error" }, "input_route": "cell-value2", "inputs": [ { "name": "start_date", "value": { "bits": null, "display": "#REF!", "kind": "error" } }, { "name": "end_date", "value": { "bits": "0x4014000000000000", "display": "5", "kind": "number" } }, { "name": "weekend", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } } ], "recorded_in": "Excel 16.0.20527.20088, Windows, bitness and CPU not recorded in this reading file" }, { "call": "NETWORKDAYS.INTL(2, 5, A3)", "excel": { "bits": null, "display": "#VALUE!", "kind": "error" }, "input_route": "cell-value2", "inputs": [ { "name": "start_date", "value": { "bits": "0x4000000000000000", "display": "2", "kind": "number" } }, { "name": "end_date", "value": { "bits": "0x4014000000000000", "display": "5", "kind": "number" } }, { "name": "weekend", "value": { "bits": null, "display": "#REF!", "kind": "error" } } ], "recorded_in": "Excel 16.0.20527.20088, Windows, bitness and CPU not recorded in this reading file" } ], "platform": "Windows, bitness and CPU not recorded in this reading file", "sources": [ "https://github.com/DnaCalc/ExcelFunctionsHandbook/blob/3345a87/content/notes/FN-NETWORKDAYS.INTL-001.json" ] }, { "behaviour": "=NETWORKDAYS.INTL(2,5,TRUE) returned 4 (0x4010000000000000). =NETWORKDAYS.INTL(2,5,FALSE) returned #NUM!. 1 further recorded control is attached. Inputs were supplied through cells using Value2, formula literals. These are controls from this environment, not a same-input comparison with another build.", "excel_build": "16.0.20527.20088", "observations": [ { "call": "=NETWORKDAYS.INTL(2,5,TRUE)", "excel": { "bits": "0x4010000000000000", "display": "4", "kind": "number" }, "input_route": "formula-literal", "inputs": [], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA" }, { "call": "=NETWORKDAYS.INTL(2,5,FALSE)", "excel": { "bits": null, "display": "#NUM!", "kind": "error" }, "input_route": "formula-literal", "inputs": [], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA" }, { "call": "=NETWORKDAYS.INTL(B1,5,1)", "excel": { "bits": "0x4010000000000000", "display": "4", "kind": "number" }, "input_route": "cell-value2", "inputs": [ { "name": "B1", "value": { "bits": null, "display": "(empty cell)", "kind": "blank" } } ], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA" } ], "platform": "Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "sources": [ "https://github.com/DnaCalc/ExcelFunctionsHandbook/blob/3345a87/content/notes/FN-NETWORKDAYS.INTL-001.json", "https://github.com/DnaCalc/ExcelFunctionsHandbook/blob/3345a87/content/notes/FN-WORKDAY-001.json" ] }, { "behaviour": "2,400 captured inputs are indexed for this environment. Capture dates: 2026-09-24 to 2026-09-25. This is a reading count, not a comparison with another build.", "excel_build": "16.0 build 20430", "platform": "Windows, 64-bit, AMD Ryzen 7 4800H with Radeon Graphics", "sources": [ "https://github.com/DnaCalc/ExcelFunctionsHandbook/blob/5dc75391aa5125ccc5abdb095da85950980d6fd8/content/evidence/environments/FUNC.NETWORKDAYS.INTL.json" ] } ] }