diff --git a/crates/functions/src/date.rs b/crates/functions/src/date.rs index 93328154b..21d2a49c1 100644 --- a/crates/functions/src/date.rs +++ b/crates/functions/src/date.rs @@ -449,13 +449,15 @@ pub(crate) fn yearfrac_core(sys: DateSystem, s: i64, e: i64, basis: i64) -> R { let (mut a, mut b) = (d1.day as i64, d2.day as i64); + // Excel tests the end-31 rule against the original start day, before a February end moves to 30. + let start_30 = a >= 30; if last_of_feb(&d1) && last_of_feb(&d2) { b = 30; } if last_of_feb(&d1) || a == 31 { a = 30; } - if a == 30 && b == 31 { + if start_30 && b == 31 { b = 30; } ((d2.year as i64 - d1.year as i64) * 360 + (d2.month as i64 - d1.month as i64) * 30 + b - a) as f64 / 360.0 @@ -817,8 +819,13 @@ mod tests { #[test] fn yearfrac_basis0_feb_end_to_31() { - close(ev("YEARFRAC", vec![n(d(2021.0, 2.0, 28.0)), n(d(2021.0, 3.0, 31.0)), n(0.0)]), 30.0 / 360.0); - close(ev("YEARFRAC", vec![n(d(2020.0, 2.0, 29.0)), n(d(2020.0, 3.0, 31.0)), n(0.0)]), 30.0 / 360.0); + // Excel 16: a February-end start keeps its original day for the end-31 test, so 31 days. + close(ev("YEARFRAC", vec![n(d(2021.0, 2.0, 28.0)), n(d(2021.0, 3.0, 31.0)), n(0.0)]), 0.086_111_111_111_111_11); + close(ev("YEARFRAC", vec![n(d(2020.0, 2.0, 29.0)), n(d(2020.0, 3.0, 31.0)), n(0.0)]), 0.086_111_111_111_111_11); + close(ev("YEARFRAC", vec![n(d(2021.0, 3.0, 31.0)), n(d(2021.0, 2.0, 28.0)), n(0.0)]), 0.086_111_111_111_111_11); + close(ev("YEARFRAC", vec![n(d(2021.0, 1.0, 31.0)), n(d(2021.0, 2.0, 28.0)), n(0.0)]), 0.077_777_777_777_777_78); + close(ev("YEARFRAC", vec![n(d(2021.0, 1.0, 30.0)), n(d(2021.0, 3.0, 31.0)), n(0.0)]), 1.0 / 6.0); + close(ev("YEARFRAC", vec![n(d(2020.0, 2.0, 29.0)), n(d(2021.0, 2.0, 28.0)), n(0.0)]), 1.0); close(ev("YEARFRAC", vec![n(d(2021.0, 2.0, 28.0)), n(d(2021.0, 2.0, 28.0)), n(0.0)]), 0.0); } diff --git a/docs/function-parity.md b/docs/function-parity.md index 818090feb..63e3288bc 100644 --- a/docs/function-parity.md +++ b/docs/function-parity.md @@ -1,6 +1,6 @@ # Function parity: worksheet functions and formulas -> **Last reviewed:** 2026-10-31 · **Last updated:** 2026-10-31 · **Change:** minor (edge cases matched to Excel: base conversions, BITLSHIFT/BITRSHIFT, UNICHAR noncharacters, UPPER/LOWER/PROPER casing, FIXED/DOLLAR output, F/T/GAMMA/WEIBULL/BETA distributions, BINOM trial cap, HARMEAN; earlier: ECMA.CEILING listed with USDOLLAR as not on Microsoft's list; earlier: IMSQRT reproduces the stray real part Excel gives for negative reals) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4 +> **Last reviewed:** 2026-10-31 · **Last updated:** 2026-10-31 · **Change:** minor (edge cases matched to Excel: base conversions, BITLSHIFT/BITRSHIFT, UNICHAR noncharacters, UPPER/LOWER/PROPER casing, FIXED/DOLLAR output, F/T/GAMMA/WEIBULL/BETA distributions, BINOM trial cap, HARMEAN; earlier: function edge-case parity row; earlier: ECMA.CEILING listed with USDOLLAR as not on Microsoft's list; earlier: IMSQRT reproduces the stray real part Excel gives for negative reals) · **Target:** Microsoft Excel (Microsoft 365), Excel for Mac 16.113.4 Excel's worksheet functions, category by category, against GridCraft's function library. Part of [target-app-parity.md](target-app-parity.md); gaps feed [gaps.md](gaps.md). @@ -86,6 +86,7 @@ This improves series preparation; it does not change the model-fitting or season | Implicit intersection `@`, legacy CSE array formulas | done; legacy array range fill (PR #156) | | Implicit intersection `@`, legacy CSE array formulas | done, the entered range filled (PR #156) | | Array lifting: an array in a scalar argument evaluates the function per element | done. The Analysis ToolPak functions (EOMONTH, EDATE, WORKDAY(.INTL), NETWORKDAYS(.INTL), YEARFRAC, WEEKNUM, the COUP*, PRICE*, YIELD*, ODD*, TBILL*, ACCRINT*, AMOR*, DISC, DURATION, CUMIPMT/CUMPRINC, EFFECT, NOMINAL, DOLLARDE/FR, XNPV/XIRR rate and guess, FVSCHEDULE principal, ISEVEN/ISODD, QUOTIENT, MROUND, FACTDOUBLE, SQRTPI, RANDBETWEEN, SERIESSUM, the base conversions, CONVERT, DELTA, GESTEP, ERF/ERFC, BESSEL*, COMPLEX and IM* except IMSUM/IMPRODUCT) give `#VALUE!` for a reference to more than one cell in a value argument, as Excel 365 does in both dynamic-array and legacy formulas; array constants and computed arrays (`A1:A3+0`) still lift, and range arguments (holidays, schedule, cash flows) and the .INTL weekend accept ranges. Difference: BYROW/BYCOL pass their row or column to the LAMBDA as values, so `BYROW(A1:B3,LAMBDA(r,EOMONTH(r,0)))` lifts where Excel gives `#VALUE!` | +| YEARFRAC basis 0, February-end start to day 31 | done: Excel 16.0 returns 31/360 for `YEARFRAC(2021-02-28,2021-03-31,0)` (0.08611111111111111); regression also covers leap day and reversed dates | | Trim references `A1:.E10` (trailing), `A1.:E10` (leading), `A1.:.E10` (both), also on whole rows/columns (`A:.A`) | done; evaluated as `TRIMRANGE(range, code, code)`, adjusted on insert/delete; files store `_xlfn.TRIMRANGE(range,code,code)` (Excel's own file spelling unconfirmed in public docs), `_xlfn._TRO_ALL/_TRO_LEADING/_TRO_TRAILING(...)` read too | | LET, LAMBDA, named LAMBDAs, ISOMITTED, MAP/REDUCE/SCAN/BYROW/BYCOL/MAKEARRAY | done. A LAMBDA that calls itself more than 140 times, or a formula nested past the depth limit, gives `#NUM!` (the target app allows deeper recursion, #1581). Calling a defined name that holds an error value gives that error, not `#NAME?` | | Iterative calculation for circular references | done: with Enable Iterative Calculation on (`formulas.calculationOptions` `{iterative, maxIterations, maxChange}`, saved as ``), loops are evaluated again from their previous values (blank = 0) until no cell on a loop changes by Maximum Change or Maximum Iterations is reached; off, cycles give `#CIRC!`. Set in File › Options › Formulas (Enable iterative calculation, Maximum Iterations 1 to 32767, Maximum Change 0 or more; the two fields are disabled while iteration is off). Differences: GridCraft recalculates on open, so a loop that never settles (`=A1+1`) advances again each time the file is opened @@ -147,6 +148,7 @@ workbooks; results checked in as data, not Excel files) and fixing what it finds | 2026-10-31 | minor | BINOM.DIST and BINOM.DIST.RANGE reject trial counts above 2,147,483,646 after truncation | | 2026-10-31 | minor | BETA.DIST density returns `#NUM!` at the lower endpoint with alpha less than or equal to 1 and upper endpoint with beta less than or equal to 1; cumulative behavior is unchanged | | 2026-10-31 | minor | HARMEAN returns `#N/A` when array or reference inputs contain no numbers; nonpositive numeric observations remain `#NUM!` | +| 2026-10-30 | minor | Added a function edge-case parity row. | | 2026-10-27 | minor | ECMA.CEILING added to the functions that are in our library but not on Microsoft's list (with USDOLLAR), so the counts don't change | | 2026-10-26 | minor | IMSQRT uses Excel's polar route with its cosine reduction, so `IMSQRT("-4")` is `1.22514845490862E-16+2i` as in Excel (exact `2i` before); the rows list the IM* differences still open | | 2026-10-25 | minor | LAMBDA row: a LAMBDA that calls itself more than 140 times, and a formula nested past the depth limit, give `#NUM!` (#1809; nesting gave `#CALC!` before). `=Foo(1)` where the defined name Foo holds `#N/A` gives `#N/A`, not `#NAME?` |