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# ASP - Date Diff

Posted on 1999-01-18
Medium Priority
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I need to calculate the number of months/days/hours/minutes left till a given date in history. Is there anything that will make this easier or will I have to do this manually...
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Question by:jkb2
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Expert Comment

ID: 1832326
You can use DateDiff in ASP:

Days from today: <%=DateDiff("d", Now, theDate)%>

DateDiff(interval, date1, date2 [,firstdayofweek[,firstweekofyear]])

The DateDiff function syntax has these parts:

Part Description
interval Required. String expression that is the interval you want to use to calculate the differences between date1 and date2. See Settings section for values.
date1, date2 Required. Date expressions. Two dates you want to use in the calculation.
firstdayofweek Optional. Constant that specifies the day of the week. If not specified, Sunday is assumed. See Settings section for values.
firstweekofyear Optional. Constant that specifies the first week of the year. If not specified, the first week is assumed to be the week in which January 1 occurs. See Settings section for values.

Settings
The interval argument can have the following values:
Setting Description
yyyy Year
q Quarter
m Month
y Day of year
d Day
w Weekday
ww Week of year
h Hour
n Minute
s Second

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Author Comment

ID: 1832327
While I can see how the DateDiff will give me number of days, I am in need of not only days but hours/minutes/seconds from Now().

Can DateDiff do this?
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Accepted Solution

MasseyM earned 300 total points
ID: 1832328
Yes.  YOU just have to use datadiff correctly.

Seconds = Datediff("s", olddate, now())
Minutes = Datediff("m", olddate, now())
HOurs = datediff("h", olddate, now())

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Author Comment

ID: 1832329
For the Most Part you were correct. I was able to use the DateDiff with the "s" flag to get total number of seconds and get back to the number I was looking for...

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