If you want to sync your Timetastic calendar into your Google calendar using the ical feed, just follow these steps:
1) Click "My Calendar" from the main menu.
2) Select "Calendar Integrations"
We are looking at the lower section headed "Calendar Subscriptions"
3) Click on the "Copy Url" link to copy it to your clipboard.
4) Go into your Google calendar and click on the + next to "Other calendars"
6) Select "From URL"
7) Paste your link into the pop up box and click "Add Calendar"
That's it! All of your Timetastic holidays should now be showing in your Google Calendar