Have you tried T2 Mood Tracker? It's an app for your smartphone developed by the US government. You can rate your moods every day and it keeps a chart of them with history. I started tracking in March 2013 so I have a year's history chart now. It has a diary function so you can relate your moods to what happened that day. It's also customizable. And you can back it up too. I found it very useful.

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