Given below are useful tips on PowerShell DateTime operations (from my 2010 scratchpad):
# Get Formatted DateTime PS C:\> Get-Date -Format "dd/MM/yyyy" 28/12/2010 PS C:\> $(Get-Date -Format "yyyyMMddHHmmss") + ".log" 20101228064357.log # Time till New Year PS C:\> $now = [datetime]::Now PS C:\> [datetime] ([string] ($now.Year+1) + "-01-01") - $now Days : 3 Hours : 17 Minutes : 14 Seconds : 28 Milliseconds : 970 Ticks : 3212689708670 TotalDays : 3.7183908665162 TotalHours : 89.2413807963889 TotalMinutes : 5354.48284778333 TotalSeconds : 321268.970867 TotalMilliseconds : 321268970.867 # Days between dates PS C:\> [string] $([datetime] "01/26/2010" - [datetime] "01/01/2010").Days + " Days" 25 Days # DateTime Comparison PS C:\> [datetime]::Compare([datetime] "01/01/10", [datetime] "01/01/11") -1 PS C:\> [datetime]::Compare([datetime] "01/01/10", [datetime] "01/01/09") 1 PS C:\> [datetime]::Compare([datetime] "01/01/10", [datetime] "01/01/10") 0 PS C:\> [datetime]::Compare([datetime] "01/01/10 20:00", [datetime] "01/01/10 19:00") 1 # Add and Subtract Time PS C:\> [datetime]::now December-28-10 11:01:17 AM PS C:\> ([datetime]::now).AddHours(1) December-28-10 12:01:37 PM PS C:\> ([datetime]::now).AddHours(-1) December-28-10 10:01:42 AM
