If you want to sync your Timetastic calendar into your Office 365 calendar, just follow these quick steps:
1) Click on the little arrow in the top, right hand corner
2) Select ‘Calendar feeds’
3) Right click on the Download button next to either 'Your Holidays' or 'Your Organisation’s Holidays'
4) Select ‘Copy Link’
5) Go into your Office 365 calendar. Right-click on "Other Calendars" and click 'Open Calendar'
6) In the "Internet Calendar" field, paste your link:
That's it! All of your Timetastic holidays should now be showing in your Office 365 Calendar