First Weekday of Month

# Get first day of Month
$FirstWeekDay = Get-Date $date.Date -day 1
# if day is Sat or Sun add days until it is not
while(0,6 -contains $FirstWeekDay.DayOfWeek.value__){
    $FirstWeekDay = $FirstWeekDay.AddDays(1)
}
$FirstWeekDay

Details

Returns the first weekday of the month for any given date.

Example

PS C:\> $date = Get-Date '6/1/2019'
>> $FirstWeekDay = Get-Date $date.Date -day 1
>> while(0,6 -contains $FirstWeekDay.DayOfWeek.value__){
>>     $FirstWeekDay = $FirstWeekDay.AddDays(1)
>> }
>> $FirstWeekDay


Monday, June 3, 2019 12:00:00 AM