There's a great script on GitHub, [Get-ScheduledTasks][1] (note the S on the end of the service name).  This works on older versions of Windows going back to Windows Server 2003 / Windows XP.

Thanks to the amazing [Warren F][2] (aka Rambling Cookie Monster) for creating & sharing this.


  [1]: https://github.com/RamblingCookieMonster/PowerShell/blob/master/Get-ScheduledTasks.ps1
  [2]: http://ramblingcookiemonster.github.io/