First Day Of Month
Get-Date $date.Date -day 1
PS C:\> $Date = Get-Date >> Get-Date $date.Date -day 1 Friday, March 1, 2019 12:00:00 AM
Get-Date $date.Date -day 1
PS C:\> $Date = Get-Date >> Get-Date $date.Date -day 1 Friday, March 1, 2019 12:00:00 AM