Function to find the closest date to a given date

Find-ClosestDate.ps1

function Find-ClosestDate {
    param(
        [Parameter(Mandatory)]
        [DateTime]$GivenDate,

        [Parameter(Mandatory)]
        [DateTime[]]$CompareDates
    )

    $Result = $CompareDates | Select-Object -Property Date, @{ Name = "Index"; Expression = { [math]::abs($($_.Subtract($GivenDate)).TotalSeconds) } } |
        Sort-Object -Property Index | Select-Object -First 1

    if ($null -ne $Result) {
        return $Result.Date
    }
}