I figured out the format, it goes like this:
All data is in little endian.
To get the time in minutes, the value must be bitsifted to right five times. For example:
6e8b >> 5 = 884
884 minutes = 14 hours, 44 minutes (14:44)
Date is days from 1.1.1900. For example:
a2eb = 41707 (11.03.2014)