How to Format a variable with leading zeros in Powershell

If you need to format a number in Powershell to include leading zeros, so that the length is always a fixed width, it is easy to do with Powershell format operator.

I was working with some data that stored dates as single digits for those days and months that only contained a single digit. For example I needed “1/1/2019” to be “01/01/2019”.

Using the powershell “-f” operator it is easy to add the leading zeros. For example:

PS C:\> "{0:d2}/{1:d2}/{2:d4}" -f 1,1,2019
01/01/2019

You can easily wrap this in a loop like this:

foreach ($months in @(1..12)) 
{
    $Month = "{0:d2}" -f $months
    foreach ($days in @(1..31))
    {
        $Day = "{0:d2}" -f $days
        $ArchiveFolder =  "D:\Archive\PDF19$month$day"
        Write-Host $ArchiveFolder
    }
    
}