W3Schools.com

VBScript DateDiff Function

VBScript Reference Complete VBScript Reference

The DateDiff function returns the number of intervals between two dates.

Syntax

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

Parameter Description
interval Required. The interval you want to use to calculate the differences between date1 and date2

Can take the following values:

  • yyyy - Year
  • q - Quarter
  • m - Month
  • y - Day of year
  • d - Day
  • w - Weekday
  • ww - Week of year
  • h - Hour
  • n - Minute
  • s - Second
date1,date2 Required. Date expressions. Two dates you want to use in the calculation
firstdayofweek Optional. Specifies the day of the week.

Can take the following values:

  • 0 = vbUseSystemDayOfWeek - Use National Language Support (NLS) API setting
  • 1 = vbSunday - Sunday (default)
  • 2 = vbMonday - Monday
  • 3 = vbTuesday - Tuesday
  • 4 = vbWednesday - Wednesday
  • 5 = vbThursday - Thursday
  • 6 = vbFriday - Friday
  • 7 = vbSaturday - Saturday
firstweekofyear Optional. Specifies the first week of the year.

Can take the following values:

  • 0 = vbUseSystem - Use National Language Support (NLS) API setting
  • 1 = vbFirstJan1 - Start with the week in which January 1 occurs (default)
  • 2 = vbFirstFourDays - Start with the week that has at least four days in the new year
  • 3 = vbFirstFullWeek - Start with the first full week of the new year

Examples

Example 1

The difference between January 31 2009, and January 31 2010:

<script type="text/vbscript">

fromDate="31-Jan-09 00:00:00"
toDate="31-Jan-10 23:59:00"
document.write(DateDiff("yyyy",fromDate,toDate) & "<br />")
document.write(DateDiff("q",fromDate,toDate) & "<br />")
document.write(DateDiff("m",fromDate,toDate) & "<br />")
document.write(DateDiff("y",fromDate,toDate) & "<br />")
document.write(DateDiff("d",fromDate,toDate) & "<br />")
document.write(DateDiff("w",fromDate,toDate) & "<br />")
document.write(DateDiff("ww",fromDate,toDate) & "<br />")
document.write(DateDiff("h",fromDate,toDate) & "<br />")
document.write(DateDiff("n",fromDate,toDate) & "<br />")
document.write(DateDiff("s",fromDate,toDate) & "<br />")

</script>

The output of the code above will be:

1
4
12
365
365
52
53
8783
527039
31622340

Try it yourself »

Example 2

How many weeks (start on Monday),
between December 31 2009 and December 31 2012:

<script type="text/vbscript">

fromDate=CDate("2009/12/31")
toDate=CDate("2012/12/31")
document.write(DateDiff("w",fromDate,toDate,vbMonday))

</script>

The output of the code above will be:

156

Try it yourself »

VBScript Reference Complete VBScript Reference
W3Schools Certification

W3Schools' Online Certification

The perfect solution for professionals who need to balance work, family, and career building.

More than 10 000 certificates already issued!

Get Your Certificate »

The HTML Certificate documents your knowledge of HTML.

The CSS Certificate documents your knowledge of advanced CSS.

The JavaScript Certificate documents your knowledge of JavaScript and HTML DOM.

The jQuery Certificate documents your knowledge of jQuery.

The XML Certificate documents your knowledge of XML, XML DOM and XSLT.

The ASP Certificate documents your knowledge of ASP, SQL, and ADO.

The PHP Certificate documents your knowledge of PHP and SQL (MySQL).

WEB HOSTING
Best Web Hosting
PHP MySQL Hosting
Best Hosting Coupons
UK Reseller Hosting
Cloud Hosting
Top Web Hosting
$7.95/mo SEO Hosting
Premium Website Design
WEB BUILDING
Download XML Editor
FREE Website BUILDER
Free Website Templates Free CSS Templates
Make Your Own Website
W3SCHOOLS EXAMS
Get Certified in:
HTML, CSS, JavaScript, XML, PHP, and ASP
W3SCHOOLS BOOKS
New Books:
HTML, CSS
JavaScript, and Ajax
STATISTICS
Browser Statistics
Browser OS
Browser Display
SHARE THIS PAGE