Why does GtkCalendar counts months from 0?

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http://askubuntu.com – So I spent several hours in rage, figuring out why isn't my code writing to the /sys/class/rtc/rtc0/wakealarm correctly. The problem is that it doesn't return anything if the value is wrong. And finally I noticed this small 5 between the year and the day. Why isn't it counting days and years from zero for consistency, for **'s sake! So GtkCalendar... F**k You! (HowTos)