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date2jDate.cmd
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date2jDate.cmd
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@ECHO OFF
SETLOCAL ENABLEDELAYEDEXPANSION&::(Don't pollute the global environment with the following)
::**********************************************************************
SET $NAME=%~n0
SET $DESCRIPTION=Converts ISO date to Julian date
SET $AUTHOR=Erik Bachmann, ClicketyClick.dk [ErikBachmann@ClicketyClick.dk]
SET $SOURCE=%~f0
::@(#)NAME
::@(-) The name of the command or function, followed by a one-line description of what it does.
::@(#) %$NAME% -- %$DESCRIPTION%
::@(#)
::@(#)SYNOPSIS
::@(-) In the case of a command, a formal description of how to run it and what command line options it takes.
::@(-) For program functions, a list of the parameters the function takes and which header file contains its definition.
::@(-)
::@(#) %$NAME% [VAR] [IsoDate]
::@(#)
::@(#)OPTIONS
::@(-) Flags, parameters, arguments (NOT the Monty Python way)
::@(#) -h Help page
::@(#)
::@ (#)
::@(#)DESCRIPTION
::@(-) A textual description of the functioning of the command or function.
::@(#) Converts a ISO date [YYYY-MM-DD] to a Julian date number
::@(#)
::@(#)EXAMPLES
::@(-) Some examples of common usage.
::@(#) CALL %$NAME% _var 2015-03-27
::@(#) Should give _var=2457108
::@(#)
::@(#) CALL shortDate2Iso _sdate "27/03/2015"
::@(#) CALL %$NAME% _var %_sdate%
::@(#)
::@ (#)EXIT STATUS
::@(-) Exit status / errorlevel is 0 if OK, otherwise 1+.
::@ (#)
::@ (#)ENVIRONMENT
::@(-) Variables affected
::@ (#)
::@ (#)
::@ (#)FILES,
::@(-) Files used, required, affected
::@ (#)
::@ (#)
::@ (#)BUGS / KNOWN PROBLEMS
::@(-) If any known
::@ (#)
::@ (#)
::@(#)REQUIRES
::@(-) Dependecies
::@(#) _Debug.cmd Setting up debug environment for batch scripts
::@(#) _GetOpt.cmd Parse command line options and create environment vars
::@(#)
::@(#)SEE ALSO
::@(-) A list of related commands or functions.
::@ (#) date2jdate.cmd Converts ISO date to Julian date
::@(#) jdate2date.cmd converts julian days to gregorian date format
::@(#) shortDate2Iso.cmd Converts shortDate to ISO [YYYY-MM-ddThh:mm]
::@(#) date.reference.csv Reference file for date convertions
::@(#)
::@(#)REFERENCE
::@(-) References to inspiration, clips and other documentation
::@ (#) Author:
::@(#) URL: http://en.wikipedia.org/wiki/Julian_day
::@(#) URL: http://en.wikipedia.org/wiki/ISO_8601
::@(#)
::@(#)SOURCE
::@(-) Where to find this source
::@(#) %$Source%
::@(#)
::@ (#)AUTHOR
::@(-) Who did what
::@ (#) %$AUTHOR%
::*** HISTORY **********************************************************
::SET $VERSION=YYYY-MM-DD&SET $REVISION=hh:mm:ss&SET $COMMENT=Description/init
::SET $VERSION=2015-02-19&SET $REVISION=00:00:00&SET $COMMENT=Initial/ErikBachmann
SET $VERSION=2015-10-08&SET $REVISION=11:20:00&SET $COMMENT=GetOpt: Calling usage on -h and exit on error / ErikBachmann
::**********************************************************************
::@(#)(c)%$Version:~0,4% %$Author%
::**********************************************************************
CALL "%~dp0\_DEBUG"
CALL "%~dp0\_Getopt" %*&IF ERRORLEVEL 1 EXIT /B 1
::ENDLOCAL
:gregorianDate2JulianDate VAR "ISOdate"
::SETLOCAL
::http://scienceworld.wolfram.com/astronomy/JulianDate.html
::For Gregorian calendar dates 1901-2099, the formula can be simplified!!
:: Expecting date in ISO format: YYYY-MM-DD
SET _DEBUG_=IF DEFINED DEBUG IF NOT "0"=="%DEBUG%" ECHO:[%0]:
SET _YYYY=%~2
%_DEBUG_% YYYY=[%_YYYY%]
:: Use modulus to avoid confusion with octal values
SET /A _MM=1%_YYYY:~5,2% %% 100
SET /A _DD=1%_YYYY:~8,2% %% 100
SET _YYYY=%_YYYY:~0,4%
SET _REF=%3
%_DEBUG_% YYYY[%_YYYY%] MM[%_mm%] dd[%_dd%] ref[%_ref%]
SET /A _JD=(367 * %_YYYY%) - (7 * (%_YYYY% + ((%_MM% + 9) / 12 )) /4 ) + (275 * %_mm% / 9) + %_dd% + 1721013,5 + (0 / 24)
:: Add an extra day if .5+
:: IF DEFINED _REF (
IF "!."=="!%_REF:~-2,1%" SET /A _REF+=1
IF "%_JD%"=="%_ref%" (SET _result=0) else SET _result=1
:: )
ENDLOCAL&SET %~1=%_jd%&EXIT /B %_result%
GOTO :EOF
::*** End of File *****************************************************