Number of months with only 30 days
There are 12 months and the numbers of days follow the Julian and... [DOC] [TLE] DAYS IN EACH MONTH - EUdesign [PAR] The number of days in each month has remained unchanged for 2000 years (
since ... Each "knuckle" month has 31 days, while each "valley" month has only 
30... [DOC] [TLE] Trick to remember which months have 31 days - Happy Hooligans [PAR] Use your knuckles to figure out which months have 31 days!