For reporting and similar use cases, scripts may require the first and last day in a given month. The first day is easy, yet the last day depends on month and year. Here is a simple calculator. Just specify the month and year you need:

[ValidateRange(1,12)][int]$month = 3
$year = 2019
$last = [DateTime]::DaysInMonth($year, $month)
$first = Get-Date -Day 1 -Month $month -Year $year -Hour 0 -Minute 0 -Second 0
$last = Get-Date -Day $last -Month $month -Year $year -Hour 23 -Minute 59 -Second 59
 
PS> $first
3/1/2019 12:00:00 AM

PS> $last
3/31/2019 11:59:59 PM

PS>
 

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