Private/ConvertFrom-LocalDate.ps1

<#
Helper function to convert a local format string to datetime
#>

function ConvertFrom-LocalDate()
{

    [CmdletBinding()]
    Param(
        [Parameter(Mandatory = $true,HelpMessage = 'Date in your computer local date format',ValueFromPipeline = $true)]
        [ValidateNotNullorEmpty()]
        [String]$Date
    )

    try
    {
        $null = $Date -as [datetime]
    }
    catch
    {
        throw 'You did not enter a valid date and time'
    }

    $DateTimeParts = $Date -split ' '
    
    $DateParts = $DateTimeParts[0] -split '/|-|\.'

    $DateFormatParts = (Get-Culture).DateTimeFormat.ShortDatePattern -split '/|-|\.'
    $Month_Index = ($DateFormatParts | Select-String -Pattern 'M').LineNumber - 1
    $Day_Index = ($DateFormatParts | Select-String -Pattern 'd').LineNumber - 1
    $Year_Index = ($DateFormatParts | Select-String -Pattern 'y').LineNumber - 1    
    
    $TimeParts = $DateTimeParts[1..$($DateTimeParts.Count - 1)]
    
    if (@($TimeParts).Count -eq 2)
    {
        $TimeFormatParts = (Get-Culture).DateTimeFormat.ShortTimePattern -split ' '
    
        $TT_Index = ($TimeFormatParts | Select-String -Pattern 't').LineNumber - 1
        $Time_Index = 1 - $TT_Index
        
        $Time = $TimeParts[$Time_Index,$TT_Index] -join ' '
    }
    else
    {
        $Time = $TimeParts
    }
    
    [datetime]$DateTime = [DateTime] $($($DateParts[$Month_Index,$Day_Index,$Year_Index] -join '/') + ' ' + $Time)

    return $DateTime.AddSeconds(59)

}