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QTR.PRG
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1992-09-28
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117 lines
/*
* File......: QTR.PRG
* Author....: Jo W. French dba Practical Computing
* CIS ID....: 74731,1751
* Date......: $Date: 28 Sep 1992 00:41:40 $
* Revision..: $Revision: 1.3 $
* Log file..: $Logfile: C:/nanfor/src/qtr.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/qtr.prv $
*
* Rev 1.3 28 Sep 1992 00:41:40 GLENN
* Jo French cleaned up.
*
* Rev 1.2 15 Aug 1991 23:04:28 GLENN
* Forest Belt proofread/edited/cleaned up doc
*
* Rev 1.1 14 Jun 1991 19:52:44 GLENN
* Minor edit to file header
*
* Rev 1.0 01 Apr 1991 01:02:04 GLENN
* Nanforum Toolkit
*
*/
/* $DOC$
* $FUNCNAME$
* FT_QTR()
* $CATEGORY$
* Date/Time
* $ONELINER$
* Return Calendar or Fiscal Quarter Data.
* $SYNTAX$
* FT_QTR( [ <dGivenDate> ], [ <nQtrNum> ] ) -> aDateInfo
* $ARGUMENTS$
* <dGivenDate> is any valid date in any date format. Defaults
* to current system date if not supplied.
*
* <nQtrNum> is a number from 1 to 4 signifying a quarter.
* Defaults to current quarter if not supplied.
* $RETURNS$
* A three element array containing the following data:
*
* aDateInfo[1] - The year and quarter as a character string "YYYYQQ"
* aDateInfo[2] - The beginning date of the quarter
* aDateInfo[3] - The ending date of the quarter
* $DESCRIPTION$
* FT_QTR() returns an array containing data about the quarter
* 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_QTR() 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 quarter containing 9/15/90
* aDateInfo := FT_QTR( CTOD("09/15/90") )
* ? aDateInfo[1] // 199003 (3rd quarter)
* ? aDateInfo[2] // 07/01/90 beginning of quarter 3
* ? aDateInfo[3] // 09/30/90 end of week quarter 3
*
* // get info about quarter 2 in year containing 9/15/90
* aDateInfo := FT_QTR( CTOD("09/15/90"), 2 )
* ? aDateInfo[1] // 199002
* ? aDateInfo[2] // 04/01/90 beginning of quarter 2
* ? aDateInfo[3] // 06/30/90 end of quarter 2
*
* // get info about quarter 2 in current year (1991)
* aDateInfo := FT_QTR( , 2 )
* ? aDateInfo[1] // 199102
* ? aDateInfo[2] // 04/01/91 beginning of quarter 2
* ? aDateInfo[3] // 06/30/91 end of quarter 2
* $SEEALSO$
* FT_DATECNFG() FT_WEEK() FT_MONTH() FT_YEAR()
* $END$
*/
FUNCTION FT_QTR(dGivenDate,nQtrNum)
LOCAL lIsQtr, nTemp, aRetVal
IF !(VALTYPE(dGivenDate) $ 'ND')
dGivenDate := DATE()
ELSEIF VALTYPE(dGivenDate) == 'N'
nQtrNum := dGivenDate
dGivenDate := DATE()
ENDIF
aRetval := FT_YEAR(dGivenDate)
lIsQtr := ( VALTYPE(nQtrNum) == 'N' )
IF lIsQtr
IF( nQtrNum < 1 .OR. nQtrNum > 4, nQtrNum := 4, )
dGivenDate := FT_MADD(aRetVal[2], 3*(nQtrNum - 1) )
ENDIF
nTemp := MONTH( dGivenDate ) - MONTH( aRetVal[2] )
nTemp += IF( nTemp >= 0, 1, 13 )
nTemp := INT( (nTemp - 1) / 3 )
aRetVal[1] += PADL(LTRIM(STR( nTemp + 1, 2)), 2, '0')
aRetVal[2] := FT_MADD( aRetVal[2], nTemp * 3 )
aRetVal[3] := FT_MADD( aRetVal[2], 3 ) - 1
RETURN aRetVal