Get Windows 32-bit formatted Time/Date in PowerShell - windows

Question

Is there a PowerShell command for retrieving the current datetime as a value encoded in the Windows C Runtime 32-Bit Time/Date Format?

Answer 1

I am not aware of an already existing function for that. You can do it manually like this:
$date = Get-Date
[uint16]$encodedTime = (((($date.Hour) -shl 6) + $date.Minute) -shl 5) + $date.Second / 2
[uint16]$encodedDate = (((($date.Year - 1980) -shl 4) + $date.Month) -shl 5) + $date.Day
You can combine these values further, if needed:
[uint32]$encodedTimeDate = $encodedTime -shl 16 + $encodedDate
[uint32]$encodedDateTime = $encodedDate -shl 16 + $encodedTime

Answer 2

To complement stackprotector's excellent answer, I used his code to create two helper functions to convert to and -from a dos datetime value:
function ConvertTo-DosDateTime {
[CmdletBinding()]
param (
[Parameter(Mandatory = $false, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true)]
[DateTime]$Date = (Get-Date)
)
# seconds are stored divided by 2
[uint16]$encodedTime = (((($Date.Hour) -shl 6) + $Date.Minute) -shl 5) + ($Date.Second -shr 1)
[uint16]$encodedDate = (((($Date.Year - 1980) -shl 4) + $Date.Month) -shl 5) + $Date.Day
([uint32]$encodedDate -shl 16) + $encodedTime
}
function ConvertFrom-DosDateTime {
[CmdletBinding()]
param (
[Parameter(Mandatory = $true, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true)]
[uint32]$DosDate
)
# split the 4 bytes into a date and a time part
[uint32]$encodedDate = $DosDate -shr 16
[uint32]$encodedTime = $DosDate -band 0xffff
# shift and mask-off the relevant bits
$day = $encodedDate -band 0x1f # 5 bits (0-4)
$month = ($encodedDate -shr 5) -band 0xf # 4 bits (5-8)
$year = (($encodedDate -shr 9) -band 0x7f) + 1980 # 7 bits (9-15)
# same for the time part
$secs = ($encodedTime -band 0x1f) * 2 # 5 bits (0-4)
$mins = ($encodedTime -shr 5) -band 0x3f # 6 bits (5-10)
$hrs = ($encodedTime -shr 11) -band 0x1f # 5 bits (11-15)
# return as DateTime object
Get-Date -Year $year -Month $month -Day $day -Hour $hrs -Minute $mins -Second $secs -Millisecond 0
}
All credits to stackprotector of course.