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MONTH.PRG
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1992-09-28
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/*
* File......: MONTH.PRG
* Author....: Jo W. French dba Practical Computing
* CIS ID....: 74731,1751
* Date......: $Date: 28 Sep 1992 00:40:00 $
* Revision..: $Revision: 1.3 $
* Log file..: $Logfile: C:/nanfor/src/month.prv $
*
* The functions contained herein are the original work of Jo W. French
* and are placed in the public domain.
*
* Modification history:
* ---------------------
*
* $Log: C:/nanfor/src/month.prv $
*
* Rev 1.3 28 Sep 1992 00:40:00 GLENN
* Jo French cleaned up.
*
* Rev 1.2 15 Aug 1991 23:05:42 GLENN
* Forest Belt proofread/edited/cleaned up doc
*
* Rev 1.1 14 Jun 1991 19:52:28 GLENN
* Minor edit to file header
*
* Rev 1.0 01 Apr 1991 01:01:46 GLENN
* Nanforum Toolkit
*
*/
/* $DOC$
* $FUNCNAME$
* FT_MONTH()
* $CATEGORY$
* Date/Time
* $ONELINER$
* Return Calendar or Fiscal Month Data
* $SYNTAX$
* FT_MONTH( [ <dGivenDate> ], [nMonthNum] ) -> aDateInfo
* $ARGUMENTS$
* <dGivenDate> is any valid date in any date format. Defaults
* to current system date if not supplied.
*
* <nMonthNum> is a number from 1 to 12 signifying a month.
* Defaults to current month if not supplied.
* $RETURNS$
* A three element array containing the following data:
*
* aDateInfo[1] - The year and month as a character string "YYYYMM"
* aDateInfo[2] - The beginning date of the month
* aDateInfo[3] - The ending date of the month
* $DESCRIPTION$
* FT_MONTH() returns an array containing data about the month
* containing the given date.
*
* Normally the return data will be based on a year beginning
* on January 1st with weeks beginning on Sunday.
*
* The beginning of year date and/or beginning of week day can be
* changed by using FT_DATECNFG(), which will affect all subsequent
* calls to FT_MONTH() until another call to FT_DATECNFG().
*
* The beginning of year date and beginning of week day may be reset
* to January 1 and Sunday by calling FT_DATECNFG() with no
* parameters.
* $EXAMPLES$
* // get info about month containing 9/15/90
* aDateInfo := FT_MONTH( CTOD("09/15/90") )
* ? aDateInfo[1] // 199009 (9th month)
* ? aDateInfo[2] // 09/01/90 beginning of month 9
* ? aDateInfo[3] // 09/30/90 end of week month 9
*
* // get info about month 5 in year containing 9/15/90
* aDateInfo := FT_MONTH( CTOD("09/15/90"), 5 )
* ? aDateInfo[1] // 199005
* ? aDateInfo[2] // 05/01/90 beginning of month 5
* ? aDateInfo[3] // 05/31/90 end of month 5
*
* // get info about month 5 in current year (1991)
* aDateInfo := FT_MONTH( , 5 )
* ? aDateInfo[1] // 199105
* ? aDateInfo[2] // 05/01/91 beginning of month 5
* ? aDateInfo[3] // 05/31/91 end of month 5
* $SEEALSO$
* FT_DATECNFG() FT_WEEK() FT_QTR() FT_YEAR()
* $END$
*/
FUNCTION FT_MONTH( dGivenDate, nMonthNum )
LOCAL lIsMonth, nTemp, aRetVal
IF !( VALTYPE(dGivenDate) $ 'ND')
dGivenDate := DATE()
ELSEIF VALTYPE(dGivenDate) == 'N'
nMonthNum := dGivenDate
dGivenDate := DATE()
ENDIF
aRetVal := FT_YEAR(dGivenDate)
lIsMonth := ( VALTYPE(nMonthNum) == 'N' )
IF lISMonth
IF( nMonthNum < 1 .OR. nMonthNum > 12, nMonthNum := 12, )
dGivenDate := FT_MADD(aRetVal[2], nMonthNum - 1)
ENDIF
nTemp := MONTH( dGivenDate ) - MONTH( aRetVal[2] )
nTemp += IF(nTemp >= 0, 1, 13)
aRetVal[1] += PADL(LTRIM(STR(nTemp, 2)), 2, '0')
aRetVal[2] := FT_MADD( aRetVal[2], nTemp - 1 )
aRetVal[3] := FT_MADD( aRetVal[2], 1 ) - 1
RETURN aRetVal