Counting Work Days

Ever wanted to know how many days you need to work this month? Here's a clever function that lists all the weekdays you want that are in a month. By default, Get-WeekDay returns all Mondays through Fridays in the current month. You can specify different months (and years), too, if you want to.

function Get-Weekday {
    param(
        $Month = $(Get-Date -format 'MM'),
        $Year = $(Get-Date -format 'yyyy'),
        $Days = 1..5
    )

    $MaxDays = [System.DateTime]::DaysInMonth($Year, $Month)

    1..$MaxDays | ForEach-Object {
        Get-Date -day $_ -Month $Month -Year $Year |
          Where-Object { $Days -contains $_.DayOfWeek }  
    }
}

Pipe the result to Measure-Object to count the days.

PS> Get-Weekday | Measure-Object | Select-Object -ExpandProperty Count
22

You can even pick the weekdays you want to get included. The weekday ID starts with 0 (Sunday) and ends with 6 (Saturday). So this gets you all the weekends in the current month:

PS> Get-Weekday -Days 'Saturday', 'Sunday' | Measure-Object | Select-Object -ExpandProperty Count
9

And if you know each Monday is a soccer meeting, this will tell you how many Mondays there are this month:

PS> Get-Weekday -Days 'Monday'
Monday, March 5, 2012 6:15:57 PM
Monday, March 12, 2012 6:15:57 PM
Monday, March 19, 2012 6:15:57 PM
Monday, March 26, 2012 6:15:57 PM

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