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call:date2jdate JD YYYY MM DD |
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:date2jdate JD YYYY MM DD -- converts a gregorian calender date to julian day format
:: -- JD [out] - julian days
:: -- YYYY [in] - gregorian year, i.e. 2006
:: -- MM [in] - gregorian month, i.e. 12 for december
:: -- DD [in] - gregorian day, i.e. 31
:$reference https://aa.usno.navy.mil/faq/docs/JD_Formula.html
:$created 20060101 :$changed 20080219 :$categories DateAndTime
:$source https://www.dostips.com
SETLOCAL
set "yy=%~2"&set "mm=%~3"&set "dd=%~4"
set /a "yy=10000%yy% %%10000,mm=100%mm% %% 100,dd=100%dd% %% 100"
if %yy% LSS 100 set /a yy+=2000 &rem Adds 2000 to two digit years
set /a JD=dd-32075+1461*(yy+4800+(mm-14)/12)/4+367*(mm-2-(mm-14)/12*12)/12-3*((yy+4900+(mm-14)/12)/100)/4
ENDLOCAL & IF "%~1" NEQ "" (SET %~1=%JD%) ELSE (echo.%JD%)
EXIT /b
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