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Converting VBScript's DateDiff Function

Windows PowerShell

Definition: Returns the number of intervals between two dates.


The VBScript DateDiff function is used to determine the amount of time (months, weeks, days, hours, etc.) between two date-time values. In Windows PowerShell you can perform this same kind of date arithmetic using the New-TimeSpan Cmdlet.

For example, the following command calculates the amount of time between the current date and time and 11:30 PM on December 31, 2006. Note that the Get-Date Cmdlet is used to create the two date-time values. Also note that a dollar sign ($) is used to preface each of the Get-Date commands, and each command is enclosed in parentheses. That ensures that Windows PowerShell first calculates the two date-time values, and only then uses New-TimeSpan to determine the time interval.

The command itself looks like this:

$a = New-TimeSpan $(Get-Date) $(Get-Date -month 12 -day 31 -year 2006 -hour 23 -minute 30)

When you run this command and then echo back the value of $a you should get the following (depending, of course, on the current date and time):

Days              : 109
Hours             : 3
Minutes           : 55
Seconds           : 0
Milliseconds      : 0
Ticks             : 94317000000000
TotalDays         : 109.163194444444
TotalHours        : 2619.91666666667
TotalMinutes      : 157195
TotalSeconds      : 9431700
TotalMilliseconds : 9431700000

Suppose all you really care about is the number of days between the two dates. In that case, just echo back the value of the Days property:


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