When it comes to developers’ work habits and the languages they use, C# programmers tend to start and stop work earlier than C programmers, who stay up later. But for programming outside of the common 9-to-5 workday, Haskell gets the nod.

In analysis of programming traffic on the Stack Overflow online community over for four weeks last August, Stack Overflow Insights data scientist David Robinson, found that traffic spikes during the workday—unsurprising since the site is used by programmers to help them do their jobs. “You can even see a dip at 12 p.m. when developers eat lunch,” he noted.

For his report released today, Robinson focused on four languages: C, Python, JavaScript, and C#. While C# programmers start work earlier, they tend to use the language less in the evening. “This might be because C# is often used at finance and enterprise software companies, which often start earlier and have rigid schedules,” he postulated.

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