DateDiff Function |
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Syntax
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. |
firstdayof week | 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 |
The firstdayofweek argument
can have the following values:
Constant | Value | Description |
vbUseSystem | 0 | Use National Language Support (NLS) API setting. |
vbFirstJan1 | 1 | Start with the week in which January 1 occurs (default). |
vbFirstFourDays | 2 | Start with the week that has at least four days in the new year. |
vbFirstFullWeek | 3 | Start with the first full weekof the new year. |
Remarks
You can use the DateDiff function to determine how many specified time intervals
exist between two dates. For example, you might use DateDiff to calculate the
number of days between two dates, or the number of weeks between today and the
end of the year.
To calculate the number of days between date1 and date2, you can use either
Day of year ("y") or Day ("d"). When interval is Weekday
("w"), DateDiff returns the number of weeks between the two dates.
If date1 falls on a Monday, DateDiff counts the number of Mondays until date2.
It counts date2 but not date1. If interval is Week ("ww"), however,
the DateDiff function returns the number of calendar weeks between the two dates.
It counts the number of Sundays between date1 and date2. DateDiff counts date2
if it falls on a Sunday; but it doesn't count date1, even if it does fall on
a Sunday.
If date1 refers to a later point in time than date2, the DateDiff function returns a negative number.
The firstdayofweek argument affects calculations that use the "w" and "ww" interval symbols.
If date1 or date2 is a date literal, the specified year becomes a permanent part of that date. However, if date1 or date2 is enclosed in quotation marks (" "), and you omit the year, the current year is inserted in your code each time the date1 or date2 expression is evaluated. This makes it possible to write code that can be used in different years.
When comparing December
31 to January 1 of the immediately succeeding year, DateDiff for Year ("yyyy")
returns 1 even though only a day has elapsed.
related to
DateAdd DatePart
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