Calligra Sheets DAYOFYEAR Function: Day Number, Leap Years & Examples

DAYOFYEAR returns the ordinal day number within a Gregorian calendar year: January 1 is 1; December 31 is 365 in a common year or 366 in a leap year. This Calligra-specific guide follows the official KDE function handbook, matching XML function definitions, and the pinned Calligra 26.08.2 implementation. [K1–K3]

Target and evidence status: Calligra 26.08.2, released October 8, 2026, with particular relevance to the Qt 6 / KDE Frameworks 6 application commonly distributed on Linux. Official material was checked on 2026-10-12. Testing disclosure: numerical example outputs below are expected values independently checked with Gregorian-calendar calculations and/or traced to source code; they were not observed in Calligra Sheets. The installed release, workbook settings, conversions and export behavior still need live testing. [K1–K4]

=DAYOFYEAR(year;month;date)

All three arguments are required. The pinned registry explicitly calls setParamCount(3); there are no optional arguments, omitted-argument defaults or alternative function-name aliases in that registration. The English handbook uses date as the third parameter’s name, but it means the day-of-month integer; it is not a whole date cell passed as a single argument. Both the documented result and the source branch have integer return type. [K1, K2]

Implementation detail: The source delegates its three arguments to Calligra’s DATE constructor, propagates an error from that call when the result is one, and invokes Qt’s QDate::dayOfYear(). Qt counts leap years correctly. Documentation discrepancy: the handbook description says 1...365, but its own 2000 leap-year example and Qt’s implementation establish that 366 is possible on December 31 of a leap year. This is an evidence-backed correction, not an observed Calligra display. [K1–K3, Q1]

Formula separators and locale: KDE’s English function handbook spells arguments with semicolons (;). Keep this syntax when following these Calligra examples; another installation or imported workbook may use a different delimiter. The date-counting functions discussed here return whole-number counts, which do not require locale-dependent date rendering, but cell types, date displays and parsing of text from external workbooks may still vary. Use numeric inputs rather than ambiguous quoted dates to reproduce the examples. [K1–K3]

Create a new sheet and type Year, Month, Day, Ordinal day in A1:D1. Put each row’s numeric values into A2:C8 (not quoted date strings). In D2, enter =DAYOFYEAR(A2;B2;C2) and copy D2 through D8. Here is the complete expected output table, independently calculated with Gregorian dates; it is not a recorded Calligra run. [C1, K1, K3]

Why the results differ: January 1 begins at 1. February 29 of 2024 is day 60, so March 1 becomes day 61; in 2025, March 1 is only day 60. The published KDE example DAYOFYEAR(2000;12;1) equals 336. December 31 in 2024 reaches 366. [K1, C1]

1. Days remaining after a calendar date. For a planning table with year/month/day in A2:C2 use:

=DAYSINYEAR(A2)-DAYOFYEAR(A2;B2;C2)

With A2=2024, B2=2, C2=29, expected 306 days remain after February 29 (366 - 60). If you want to count February 29 itself, add 1. The calculation relies on the separate DAYSINYEAR function from the same pinned Calligra date/time module. This pairing is source-supported and independently arithmetically calculated, not cross-function native tested. [K2, K3, C1]

2. Use a real date cell without mistaking the third argument for a serial date. If E2 contains a true Calligra date such as one entered with =DATE(2024;2;29), split its components explicitly:

=DAYOFYEAR(YEAR(E2);MONTH(E2);DAY(E2))

Expected result: 60. The YEAR, MONTH, and DAY calls supply the three integer parts. Entering =DAYOFYEAR(E2) supplies only one argument and does not follow the three-argument registration. [K1–K3, C1]

Zero day/month: The pinned func_date rejects month = 0 or day = 0, returning Calligra’s internal value error. Therefore =DAYOFYEAR(2024;2;0) and =DAYOFYEAR(2024;0;1) are source-inferred error cases; the precise text shown on-screen has not been checked. [K2, K3]

Oversized days/months: Unlike a strict date parser, the pinned constructor initializes January 1 and uses addMonths(month-1) and addDays(day-1). Thus an overflow such as a day 31 in February may normalize into March rather than rejecting the input. For predictable results, validate year/month/day fields yourself (e.g., compare the day with DAYSINMONTH(year;month) in a separate checked field). Avoid treating source inference as proof of every invalid-input edge case. [K3, Q1]

Quoted dates and imported serials: This function is not DAYOFYEAR(date-text) or Excel’s single-date syntax. If a column contains imported text dates, parse into a recognized date before calling YEAR, MONTH, DAY; otherwise conversion, locale and error behavior require native validation. [K1–K3]

Calligra 26.08.2 registers the dedicated three-argument DAYOFYEAR. Microsoft’s checked Excel date/time reference documents DATE, YEAR, and related date functions but does not list a direct DAYOFYEAR function there; that is not a claim about third-party add-ins or every competing product. For a comparable Excel worksheet using numeric year, month and day in A2:C2, use Excel’s usual comma separator: [M1]

=DATE(A2,B2,C2)-DATE(A2,1,1)+1

For the 2024-02-29 row, the expected result is 60, independently calculated. In Calligra’s documentation separator style, the equivalent arithmetic is =DATE(A2;B2;C2)-DATE(A2;1;1)+1. Do not assume a literal Calligra DAYOFYEAR(...) formula imports unchanged into Excel, Google Sheets or other programs. Inspect each program’s function support and separators before porting. [K1, M1, C1]

Wrong day number? Ensure the inputs represent a valid month/day and that the intended year is in column A. Compare a leap-year March 1 (61) with a common-year March 1 (60). If the output is 0 or an error, check for empty cells, a zero in month/day, a text value in a numeric column, or a date outside the supported Qt date domain. [K3, Q1, C1]

Why not 365 only? The handbook text’s 1...365 is an editorial simplification that conflicts with leap years; QDate::dayOfYear() can return 366. Use DAYSINYEAR(year) as the accurate year length. [K1, K3, Q1]

Unexpected output with invalid dates? Source normalization (through DATE) can make an out-of-range positive day represent a later calendar date. The example workbook deliberately uses valid dates; add explicit input validation for authoritative reporting. [K3]

What we verified, and what remains untested: The name/argument layout is official-documentation checked. The function’s C++ registration and calculation branch are source-code checked against one pinned Calligra revision. The examples are independently calculated expected results, not screenshots, automated tests or results copied from an executing Calligra instance. Evaluation of nonsensical text inputs, spreadsheet import coercions, large or negative years, overflows, plugin availability in a particular package, and exact error-display labels are not native-validated. Do not use this guide as a guarantee of behavior across every installed version. [K2, K3, Q1]

Use DATE to construct an actual date, DAY to extract a calendar day, MONTH to extract the month, YEAR for its year, and EOMONTH for a month-end date. These related functions perform distinct date operations. [K1]

• KDE Calligra Sheets official function reference — includes the DAYOFYEAR entry as well as its related date/time functions.
• KDE’s Calligra release listing — lists release 26.08.2 on 2026-10-08.
• Qt 6 QDate reference — documents the underlying Gregorian date methods cited below.
• Microsoft’s Excel date/time function reference — a separate product, relevant only to the explicitly labelled compatibility formulas.

The four external destinations above were checked for a current response when this manuscript was drafted on 2026-10-12. [K1, K4, Q1, M1]