VsoUpdateVersion.ps1

# Script to set the buildNumber to a Nuget/NuSPec compatible Semantic version
# Nuget doesn't fully support full semantic version numbers. In particular, it
# doesn't support use of the '.' in parts after a '-' is used. So, this creates
# a semantic version number that uses additional '-' characters instead of '.'
#
# For details on the general algorithm used for computing the numbers here see:
# https://msdn.microsoft.com/en-us/library/system.reflection.assemblyversionattribute.assemblyversionattribute(v=vs.110).aspx 
# The only difference from the AssemblyVersionAttribute algorithm is that this
# uses UTC for the reference times, thus ensuring that all builds are consistent
# no matter what locale the build agent or developer machine is set up for.
#
$now = [DateTime]::Now
$midnightToday = New-Object DateTime( $now.Year,$now.Month,$now.Day,0,0,0,[DateTimeKind]::Utc)
$basedate = New-Object DateTime(2000,1,1,0,0,0,[DateTimeKind]::Utc)
$buildNum = [int]($now  - $basedate).Days
$buildRevision = [int]((($now - $midnightToday).TotalSeconds) / 2)
Write-Verbose -Verbose ([String]::Format( "##vso[build.updatebuildnumber]3.9.{0}.{1}-pre",$buildNum,$buildRevision))