How can I add my girlfriends iOS calendar to my Google calendar?

I'd like to sync my girlfriend's calendar with my Google Calendar. How do I do this?
+ Bonus kudos if it can be done without using a third party app.

Thanks in advance!

Show Accepted Answer

Guest Quick Reply (No URL, BBcode or HTML)

Last post by vferry
14 minutes ago
Last post by wblanda
3 hours ago
Last post by fkessler
3 hours ago
Last post by faye.becker
47 minutes ago
Last post by bfeil
3 hours ago
need help
Started by bschiller
Last post by cormier.minnie
1 hour ago
Last post by maida.thiel
1 hour ago
Last post by olaf.lowe
20 minutes ago
Last post by torp.sven
11 minutes ago
Last post by upton.ashtyn
25 minutes ago
Last post by stanley20
24 minutes ago
Last post by jgulgowski
1 hour ago
Last post by desiree.stroman
3 hours ago
Last post by bins.thalia
2 hours ago