DateDiff
Count = DateDiff ( Date1 AS Date , Date2 AS Date , Period AS Integer ) AS Integer
Returns the number of periods between two dates.
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Date1 is the start date.
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Date2 is the end date.
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Period is the kind of period: year, month, day, week...
The number of periods is returned.
Period can be one of the following constants:
|
Constant
|
Effect
|
|---|
gb.Millisecond
|
Returns the number of milliseconds.
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gb.Second
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Returns the number of seconds.
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gb.Minute
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Returns the number of minutes.
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gb.Hour
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Returns the number of hours.
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gb.Day
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Returns the number of days.
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gb.Week
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Returns the number of weeks.
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gb.WeekDay
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Returns the number of week days (ignores Saturday and Sunday).
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gb.Month
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Returns the number of months.
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gb.Quarter
|
Returns the number of quarters.
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gb.Year
|
Returns the number of years.
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Only entire periods are returned. The result is rounded down.
Examples
PRINT DateDiff("01/02/2005 12:55:00", "01/01/2005", gb.Day)
This example shows how DateDiff works internally.
DIM date1 AS Date
DIM date2 AS Date
DIM fDiff AS Float
DIM iDiff AS Integer
date1 = Date(1964, 02, 28, 0, 29, 0
date2 = Date(1964, 03, 01, 0, 30, 0) ' one minute more than two days
fDiff = CFloat(date2) - CFloat(date1)
iDiff = Int(fDiff * 24)
PRINT "first : "; fdiff; " int:"; idiff; " DateDiff:"; DateDiff(date1, date2, gb.Hour)
date1 = Date(1964, 02, 28, 0, 30, 0
date2 = Date(1964, 03, 01, 0, 29, 0) ' one minute less than two days
fDiff = CFloat(date2) - CFloat(date1)
iDiff = Int(fDiff * 24)
PRINT "second : "; fdiff; " int:"; idiff; " DateDiff:"; DateDiff(date1, date2, gb.Hour)
first : 2.000694444403 int:48 DateDiff:48
second : 1.999305555597 int:47 DateDiff:47
See also