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DateAdd (with minutes) to skip weekends in classic ASP

Posted on 2012-03-30
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Last Modified: 2012-04-02
I'm doing some development in classic ASP.  I have a starting datetime value and I want to add to it a period of time in minutes, but it needs to skip weekends.

For example, if I have a starting datetime of Thursday @ 7:00am and I add to it 3045 minutes (50 hours: 45 minutes)...it should finish on Monday @ 9:45am.

Any ideas?

Thanks.
bruno71
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Question by:bruno71
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Accepted Solution

by:
Scott Fell,  EE MVE earned 2000 total points
ID: 37788556
I'm sure there is more then one way to do this.  I would start with finding the end date, then looping through each day to find which is a weekend day, then add the minutes for those days.  If you need to account for the start date being a weekend, then find the time it starts and subtract those minutes.  I have not tested this.  

'Assumes your start date is not on a weekend.
StartDate=request("StartDate") 'format should be in something like, "1/1/2012 08:50:00"
MinutesAdded=request("MinutesAdded")
EndDate = dateadd("n", MinutesAdded,StartDate) ' find the end date
totDays=datediff("d",StartDate,EndDate) ' find out how many days you are adding.

WeekEndCounter =0
for x = 1 to totDays
   if Weekday(DateAdd("d",x,StartDate) )=1 or Weekday(DateAdd("d",x,StartDate) )=7 then ' check for sunday or saturday
   WeekEndCounter=WeekEndCounter+1
next
AddMoreMinutes=WeekEndCounter*1440 ' 1440 minutes in a day ' could have just done days too for this
FinalDateTime = dateadd("n",AddMoreMinutes,DateEnd)

' If you need to account for the start date being a weekend, then we need to subtract some minutes.
If weekday(StartDate) = 1 or weekday(StartDate) = 7 then
     SubtractMinutes = ((hour(DateStart)*60 ) + minute(DateStart)) * -1
     FinalDateTime=dateadd("n",SubtractMinutes,FinalDateTime)

end if

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Author Closing Comment

by:bruno71
ID: 37797422
Thanks.  That worked...except I had to add one little piece.

This is to account for the recalculated ending date being on a weekend...

Do While Weekday(EndDate) = 1 or Weekday(EndDate) = 7
            EndDate = DateAdd("n", 1440, EndDate)
Loop

For example, if the ending date landed on a Tuesday and we skipped two weekends...the calculation would add 4 days - landing on a Saturday.  This just loops through to the next weekday.
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