Data update

Task/Five-weekends/PowerShell/five-weekends.ps1

@@ -0,0 +1,20 @@
+$fiveWeekends = @()
+$yearsWithout = @()
+foreach ($y in 1900..2100) {
+  $hasFiveWeekendMonth = $FALSE
+  foreach ($m in @("01","03","05","07","08",10,12)) {
+    if ((Get-Date "$y-$m-1").DayOfWeek -eq "Friday") {
+      $fiveWeekends += "$y-$m"
+      $hasFiveWeekendMonth = $TRUE
+    }
+  }
+  if ($hasFiveWeekendMonth -eq $FALSE) {
+     $yearsWithout += $y
+  }
+}
+Write-Output "Between the years 1900 and 2100, inclusive, there are $($fiveWeekends.count) months with five full weekends:"
+Write-Output "$($fiveWeekends[0..4] -join ","),...,$($fiveWeekends[-5..-1] -join ",")"
+
+Write-Output ""
+Write-Output "Extra Credit: these $($yearsWithout.count) years have no such month:"
+Write-Output ($yearsWithout -join ",")