Par2: Day object methods 1997-11-29 -- Gus Creses For you CW aficionados, here are a few date functions you might find
useful.
!-------------------------------------
OOPDateTime.AlphaMonth FUNCTION(xMo)
!Returns short name of month "xMo" (range 1-12)
!-------------------------------------
CODE
RETURN SUB(FORMAT(DATE(xMo,1,1980),@D3),1,INSTRING(' ',
FORMAT(DATE(xMo,1,1980),@D3),1,1))
!--------------------------------------------------------------------
OOPDateTime.DaysInMonth FUNCTION(xDate)
! Return number of days in month in which xDate is a date.
!--------------------------------------------------------------------
CODE
!Wrap to last day in month.
RETURN DAY(DATE(MONTH(xDate)+1,1,YEAR(xDate)) - 1)
!--------------------------------------------------------------------
OOPDateTime.IsLeapYear FUNCTION(xDate)
! Return True the year in which xDate is a date, is a leap year.
!--------------------------------------------------------------------
CODE
!Wrap to last day in February.
RETURN (DAY(DATE(3,1,YEAR(xDate)) - 1) - 28)
!--------------------------------------------------------------------
OOPDateTime.LongMonthName FUNCTION(xDate)
! Full name of month in xDate
!--------------------------------------------------------------------
CODE
RETURN SUB(FORMAT(xDate,@D4),1,INSTRING(' ', FORMAT(xDate,@D4),1,1))
!--------------------------------------------------------------------
OOPDateTime.ShortMonthName FUNCTION(xDate)
! First three letters of month in xDate
!--------------------------------------------------------------------
CODE
RETURN SUB(FORMAT(xDate,@D3),1,INSTRING(' ', FORMAT(xDate,@D3),1,1))
!--------------------------------------------------------------------
OOPDateTime.DayOfWeek FUNCTION(xDate)
! Return short day of week name in xDate
!--------------------------------------------------------------------
CODE
RETURN CHOOSE(((xDate % 7) + 1),'Sunday','Monday','Tuesday','Wednesday',
|
'Thursday','Friday','Saturday')
!--------------------------------------------------------------------
OOPDateTime.ShortDayOfWeek FUNCTION(xDate)
! Return day of week name in xDate
!--------------------------------------------------------------------
CODE
RETURN(CHOOSE(((xDate % 7) +
1),'Sun','Mon','Tue','Wed','Thu','Fri','Sat'))
!--------------------------------------------------------------------------
OOPDateTIme.WorkDays FUNCTION(xLoDate,xHiDate)
!Calculate the number of non-weekend days between two dates
!Count only Monday thru Friday. No regard for statutory holidays.
!--------------------------------------------------------------------------
Ff LONG,AUTO
Lf LONG,AUTO
CODE
!How many workdays left in first week fragment.
!----------------------------------------------------
!S M T W T F S
Ff = CHOOSE(((xLoDate % 7)+1),5,5,4,3,2,1,0)
!Advance xLoDate to first Sunday after xLoDate.
!----------------------------------------------
xLoDate += Ff
!How many workdays included in last week fragment.
!--------------------------------------------------------
!S M T W T F S
Lf = CHOOSE(((xHiDate % 7)+1),0,1,2,3,4,5,5)
!Move xHiDate backward to Sunday before xHiDate.
!-----------------------------------------------
xHiDate -= Lf
!Calculate number of workdays in the set of whole weeks
!between Sunday (xLoDate) and Sunday (xHiDate) and add
!the fragments from first and last week. This works even if
!the first and last day are today and tomorrow. Or both
!are today.
!----------------------------------------------------------
RETURN ((((xHiDate - xLoDate)/7)*5) + Ff + Lf)
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