I need a calendar that stores everything locally as I work from places that don't have internet sometimes (I'm a virtual office). I really can't figure it out from reading what I can find about the subject. I am using Mint 12.
Linux – Which application to use for a calendar
calendarlinux-mintsoftware-rec
Related Solutions
Thunderbird+Lightning is a great choice of calendar application, but these will allow you to view and use the calendar, not sync it.
I would suggest these two sync options which are independent of Google :
You can use apt-offline.
apt-offline can fully update and upgrade an APT based distribution without connecting to the network, all of it transparent to APT.
apt-offline can be used to generate a signature on a machine (with no network). This signature contains all download information required for the APT database system. This signature file can be used on another machine connected to the internet (which need not be a Debian box and can even be running windows) to download the updates. The downloaded data will contain all updates in a format understood by APT and this data can be used by apt-offline to update the non-networked machine.
There is also a GUI version: apt-offline-gui
More information in the howto Offline Package Management for APT and an answer on askubuntu.com
Best Answer
Mozilla Thunderbird plus lightning addon (official replacement for Sunbird which is no longer actively maintained)