Analyzing the syntax parameters of the DateDiff function_ASP tutorial

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describe

Returns the time interval between two dates.

grammar

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

The syntax of the DateDiff function has the following parameters:

Parameter description

interval required. String expression represents the time interval used to calculate date1 and date2. For values, see the Settings section.

date1, date2 Required options. Date expression. Two dates used for calculation.

firstdayofweek Optional. Specifies the constant for the first day of the week. If not specified, the default is Sunday. For values, see the Settings section.

firstweekofyear Optional. Specify the constant for the first week of the year. If not specified, the default is the week of January 1. For values, see the Settings section.

set up

The interval parameter can have the following values:

Setting Description

yyyy year

q Quarterly

n months

y Number of days in one year

d Day

w Number of days of a week

ww

h hours

m minutes

s seconds

The firstdayofweek parameter can have the following values:

Constant value description

vbUseSystem 0 uses the Regional Language Support (NLS) API settings.

vbSunday 1 Sunday (default)

vbMonday 2 Monday

vbTuesday 3 Tuesday

vbWednesday 4 Wednesday

vbThursday 5 Thursday

vbFriday 6 Friday

vbSaturday 7 Saturday

The firstweekofyear parameter can have the following values:

Constant value description

vbUseSystem 0 uses the Regional Language Support (NLS) API settings.

vbFirstJan1 1 starts from the week of January 1 (default).

vbFirstFourDays 2 begins with the first week of at least four days in the new year.

vbFirstFullWeek 3 starts with the first full week of the new year.

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