found a bug maybe or improper calculation

I checked the suncalc for the date 21 jun 2013 in 48deg north latitude. The results are saying that from 00:00 to 01:24 day begins with astronomical night. From 22:36 day finishes with astronomical twilight untill 00:22 next day and then from 00:22 till 00:00 is astronomical night. The same situation is for day before and day after. So basically there should not be any interval with astronomical night at the end of day or the end of this interval should be indicated as it should be properly so going to time of 01:24 next day and not backwards from 00:22 to 00:00. Also the beginning of the day should probably then start with astronomical twilight from 00:00 till 00:22.
Please check it, otherwise I found sunclac as very well and useful application. Good luck!