The 6*6*10 calendar is regular as possible. It has 6 months per year, 6 weeks per month, 10 days per week.

One month:

00 01 02 03 04 05 06 07 08 09

10 11 12 13 14 15 16 17 18 19

20 21 22 23 24 25 26 27 28 29

30 31 32 33 34 35 36 37 38 39

40 41 42 43 44 45 46 47 48 49

50 51 52 53 54 55 56 57 58 59

60

Every month ends with a blank day (60), with the exception of the last month in non-leap years.