Created attachment 188708 [details] tbillyield() does not match Excel formula and generates inconsistent numbers tbillyield() returns inconsistent sometimes incorrect yield values depending on the dates used, even though the number of days are the same. For example: settle mature days price tbillyield() computed 01/17/23 02/28/23 42 99.384 5.3127% 5.3127% 01/24/23 03/07/23 42 99.384 5.0712% 5.3127% 01/31/23 03/14/23 42 99.384 4.9585% 5.3127% The computed column uses the microsoft formula for tbillyield() is describe in https://support.microsoft.com/en-us/office/tbillyield-function-6d381232-f4b0-4cd5-8e97-45b9c03468ba tbillyield should produce the same value if the number of days and price are the same. Loading the same exact *.ods file into Excel produces correct values for tbillyeild() that matches the same computed values. So, LibreOffice is computing tbillyield() incorrectly. I hope other's aren't relying on this financial formula for their decisions.
Reproducible, same result with Google sheets and Excel, different in calc. Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: 2a9e83a673300dfe15a3acc66acd560b2a7cae43 CPU threads: 16; OS: Windows 10.0 Build 22621; UI render: default; VCL: win Locale: es-ES (es_ES); UI: en-US Calc: CL threaded
Already in OO 3.3.0.
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