A powershell function to display the life calendar in weeks.

Get-LifeCalendar.ps1

function Get-LifeCalendar {

    [CmdletBinding()]
    Param(
        $StartDate = (Get-Date -Date '1980-01-01'),
        $LifeinYear = 75
    )
    # A powershell function to display the life calendar in weeks.
    # Original idea from: https://waitbutwhy.com/2014/05/life-weeks.html
    $DaysSinceStartDate = (New-TimeSpan -Start $StartDate -End (Get-Date)).Days
    $YearSinceStartDate = ($DaysSinceStartDate - ($DaysSinceStartDate % 365)) / 365

    $DaySinceCurrentYear = (New-TimeSpan -Start (Get-Date -year (Get-Date).year -Month 1 -Day 1 ) -end (Get-Date)).Days
    $WeekSinceCurrentYear = ($DaySinceCurrentYear - ($DaySinceCurrentYear % 7)) / 7


    for ($i = 1; $i -le $YearSinceStartDate ; $i++) {    
        for ($w = 1; $w -le 52; $w ++) {
            Write-Host '-' -NoNewline
        }
    }
    for ($w = 1 ; $w -le ($WeekSinceCurrentYear - 1); $w ++) {
        Write-Host '-' -NoNewline
    }
    Write-Host '*' -NoNewline -ForegroundColor Red

    for ($w = ($WeekSinceCurrentYear + 1) ; $w -le 52; $w ++) {
        Write-Host 'o' -NoNewline -ForegroundColor Cyan
    }
    for ($i = ($YearSinceStartDate + 1); $i -le $LifeinYear ; $i++) {    
        for ($w = 1; $w -le 52; $w ++) {
            Write-Host 'o' -NoNewline -ForegroundColor Cyan
        }
    }
    Write-Host "`n`n- : past weeks`n* : this week`no : future weeks`n`n"
}