Quick Script: Date Ranges
Ever need to get an array of all the days between two dates? This script will calculate the date range and load up an array with date/time objects for every date in between the entered times:
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| Function Get-DateRange | |
| { [CmdletBinding()] | |
| Param ( | |
| [datetime]$Start = (Get-Date), | |
| [datetime]$End = (Get-Date) | |
| ) | |
| ForEach ($Num in (0..((New-TimeSpan –Start $Start –End $End).Days))) | |
| { $Start.AddDays($Num) | |
| } | |
| } |
To use it, simply call the function
- Get-DateRange
- Get-DateRange -Start 7/24/14 -End 8/1/14
- Get-DateRange -End 7/20/14
And just to pretty it up as a Function and with comment-based help:
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| Function Get-DateRange | |
| { <# | |
| .SYNOPSIS | |
| Find out all the dates inbetween the range of dates you specify | |
| .DESCRIPTION | |
| Simple function to return an array of date/time objects for all days inbetween the two dates | |
| you specify. | |
| .PARAMETER Start | |
| Start date – this specifies the beginning of your range | |
| .PARAMETER End | |
| End date – this specifies the ending of your range. This date can be before OR after the Start | |
| date. | |
| .INPUTS | |
| None | |
| .OUTPUTS | |
| [DateTime[]] | |
| .EXAMPLE | |
| Get-DateRange -Start 7/24/14 -End 7/1/14 | |
| Get all of the dates between the 24th to the 1st in reverse order. 24 DateTime objects will | |
| be returned. | |
| .EXAMPLE | |
| Get-DateRange -End 8/1/14 | |
| Get all of the dates between today and 8/1/14. As of 7/14/14 that would be 8 dates. | |
| .NOTES | |
| Author: Martin Pugh | |
| Twitter: @thesurlyadm1n | |
| Spiceworks: Martin9700 | |
| Blog: http://www.thesurlyadmin.com | |
| Changelog: | |
| 1.0 Initial Release | |
| .LINK | |
| #> | |
| [CmdletBinding()] | |
| Param ( | |
| [datetime]$Start = (Get-Date), | |
| [datetime]$End = (Get-Date) | |
| ) | |
| ForEach ($Num in (0..((New-TimeSpan –Start $Start –End $End).Days))) | |
| { $Start.AddDays($Num).Date | |
| } | |
| } |
1 Comment »
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The Surly Admin 
Like your script. I have a script that creates a a license usage. Script runs every hour and sends the output to a csv file. Customer no longer wants to see the entire usage but just the high water mark for each day. Created a script that will do that but it is a manual process. file is created with the date I.E. 2022-04-26.csv. I tried using your script to automate this process so on Monday it would walk through the previous 7 days and grab the high water mark from each file. When I try to use this. [datetime]$start = Get-Date -date $(Get-Date).AddDays(-8) -UFormat “%y/%m/%d” I get a this error.
Cannot convert value “22/04/20” to type “System.DateTime”. Error: “String was not recognized as a valid DateTime.” Any help would be appreciated.