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year.prg
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1991-08-15
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/*
* File......: YEAR.PRG
* Author....: Jo W. French dba Practical Computing
* CIS_ID....: 74731,1751
* Date......: $Date: 15 Aug 1991 23:04:56 $
* Revision..: $Revision: 1.2 $
* Log file..: $Logfile: E:/nanfor/src/year.prv $
*
* The functions contained herein are the original work of Jo W. French
* and are placed in the public domain.
*
* Modification history:
* ---------------------
*
* $Log: E:/nanfor/src/year.prv $
*
* Rev 1.2 15 Aug 1991 23:04:56 GLENN
* Forest Belt proofread/edited/cleaned up doc
*
* Rev 1.1 14 Jun 1991 19:53:20 GLENN
* Minor edit to file header
*
* Rev 1.0 01 Apr 1991 01:02:36 GLENN
* Nanforum Toolkit
*
*/
/* $DOC$
* $FUNCNAME$
* FT_YEAR()
* $CATEGORY$
* Date/Time
* $ONELINER$
* Return calendar or fiscal year data
* $SYNTAX$
* FT_YEAR( [ <dGivenDate> ] ) -> aDateInfo
* $ARGUMENTS$
* <dGivenDate> is any valid date in any date format. Defaults
* to current system date if not supplied.
* $RETURNS$
* A three element array containing the following data:
*
* aDateInfo[1] - The year as a character string "YYYY"
* aDateInfo[2] - The beginning date of the year
* aDateInfo[3] - The ending date of the year
* $DESCRIPTION$
* FT_YEAR() returns an array containing data about the year
* containing the given date.
*
* Normally the return data will be based on a year beginning
* on January 1st.
*
* The beginning of year date can be changed by using FT_DATECNFG(),
* which will affect all subsequent calls to FT_YEAR() until another
* call to FT_DATECNFG().
*
* The beginning of year date may be reset to January 1 by calling
* FT_DATECNFG() with no parameters.
* $EXAMPLES$
* // Get info about year containing 9/15/90, assuming default
* // beginning of year is January 1st.
* aDateInfo := FT_YEAR( Ctod("09/15/90") )
* ? aDateInfo[1] // 1990
* ? aDateInfo[2] // 01/01/90 beginning of year
* ? aDateInfo[3] // 12/31/90 end of year
*
* // get info about current year (1991).
* aDateInfo := FT_YEAR()
* ? aDateInfo[1] // 1991
* ? aDateInfo[2] // 01/01/91 beginning of year
* ? aDateInfo[3] // 12/31/91 end of year
* $SEEALSO$
* FT_DATECNFG() FT_WEEK() FT_MONTH() FT_QTR()
* $END$
*/
FUNCTION FT_YEAR(dGivenDate)
LOCAL aRetVal[3], aTemp, cFY_Start
LOCAL cDateFormat := SET(_SET_DATEFORMAT)
aTemp := FT_DATECNFG()
cFY_Start := aTemp[1]
SET(_SET_DATEFORMAT, "yyyy.mm.dd")
dGivenDate := IF(dGivenDate == NIL .OR. VALTYPE(dGivenDate) != 'D',;
DATE(), dGivenDate)
aRetVal[2] := CTOD(STR( YEAR(dGivenDate) - IF(MONTH(dGivenDate) < ;
MONTH(CTOD(cFY_Start)), 1, 0), 4) + ;
SUBSTR(cFY_Start, 5, 6) )
aRetval[3] := FT_MADD(aRetVal[2], 12) - 1
aRetVal[1] := STR(YEAR(aRetVal[3]),4) // End of Year
SET(_SET_DATEFORMAT, cDateFormat)
RETURN aRetVal