Twitter actually knows what day of the week is the happiest.

Twitter Data Editor Simon Rogers shared some findings recently about what tweeting has revealed about our personal happiness.

Twitter went through billions of tweets to analyze when people feel the happiest based on when they tweeted the word 'happy'.

They also searched for the words 'sad', 'late for work' and 'hungover', or depressed in similar analyses.

According to their findings, the happiest time of the year is usually in the second half of the year near the holidays.

In fact many negative tweets arise during this time of the year as well.

Late for work? That usually happens in the middle of the week in the Summer and Early Winter.

Hungover seems to be prevalent on Fridays and Saturdays, no big surprise here, but mostly in the colder months.