Powershell: Change date to int? - powershell

Question

I have a cmdlet that is expecting an int32 for the date instead of a normalized input.
Set-CTXGroupPolicyConfiguration, RebootScheduleStartDate wants int32-input. For instance, if i enter this into policy manually, it has tomorrow, 1/18/2015 as 132055314. Coming up blank with what that number is even referring to.

Answer 1

This was fun. I found this Citrix Support site where they describe how the dates are stored as a dword (uint32) value in registry. The dword-value is created like:
Date is split into year, month and date
Each value is converted to hex-value
The hex-values are combined (16bit year, 8bit month, 8bit day) in the pattern yyyyMMdd
The combined hex-value is converted to decimal
I've created a couple of functions to convert the dates for you:
function ConvertFrom-DwordDate([int32]$DwordValue) {
#Ex. $DwordValue = 132055314
#Convert to hex with 8 chars (16bit year + 8bit month + 8bit day)
$hex = $DwordValue.ToString('X8')
#Ex. $hex = 0x07df0112 = 0x07df(year) 0x01 (month) 0x12 (day)
#Convert to date string
$datestring = '{0:D4}\{1:D2}\{2:D2}' -f [convert]::ToUInt32($hex.Substring(0,4),16), [convert]::ToUInt32($hex.Substring(4,2),16), [convert]::ToUInt32($hex.Substring(6,2),16)
#Convert to datetime and output
$datetime = [datetime]::ParseExact($datestring,'yyyy\\MM\\dd',$null)
#Output
$datetime
}
function ConvertTo-DwordDate([datetime]$Date) {
#Convert to combined hex
$combinedhex = '{0:X}{1:X2}{2:X2}' -f $Date.Year, $Date.Month, $Date.Day
#Convert to decimal
$decimal = [convert]::ToUInt32($combinedhex,16)
#Ouput
$decimal
}
ConvertTo-DwordDate -Date (Get-Date).AddDays(1)
132055314
ConvertFrom-DwordDate -DwordValue 132055314
søndag 18. januar 2015 00.00.00

Answer 2

I know this is a ridiculously old post but it's the top response on Google for "powershell get-date as int".
$DateInt = [Int]((Get-Date).addDays(-100).ToString('yyyyMMdd'))