Get-2amOfThirdMondayInMonth.ps1
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Script
function Get-2amOfThirdMondayInMonth ($Date) {
#get the number of the current month
$thisMonth = $date.Month
# set the date to first of the current month,
#the hours, minutes and the rest are taken from the current time,
#so use the .Date to get midnight instead
$midnightOfFirst = (Get-Date -Day 1 -Month $thisMonth).Date
#What day of week is the first?
$dayOfWeek = $midnightOfFirst.DayOfWeek
#sunday is 0 in the WeekOfDay enum , but we need monday to be 0,
#so we move the sunday at the end (6)
#use [enum]::GetValues([dayofweek]) | foreach { "$_ : " + [int]$_ } to
#see the values for yourself
if ($dayOfWeek -eq "Sunday") {
$dayOfWeek = 6
}
else {
$dayOfWeek = [int]$dayOfWeek - 1
}
#add two weeks and number of days that remain from week to reach monday
#(on monday we need 0 days to reach monday, on sunday we need one)
$thirdMonday = New-TimeSpan -Days (2 * 7 + 7 - $dayofweek)
#add the weeks + offset to the first of the month
$thirdMonday = $midnightOfFirst.Add($thirdMonday)
#add two hours to read 2 am
$thirdMonday.AddHours(2)
}
<# test
$startDate = (Get-Date).AddYears(1)
1..20 | foreach {
Get-2amOfThirdMondayInMonth $startDate.AddMonths($_)
}
#>
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