I’m Thais people. In Thailand we have the name of the month. If the last word read ” yon” that mean 30, and if it read ” kom” that mean 31.just like this example
: January in Thais name = Makarakom = 31 days.
: November in Thais name=
Prusajikayon = 30 days.
Ps.February is the only one that our last word read ” pan”…this month in Thais name is “Kumpapan” = 28-29 days.
My generation he was so clever by can do the hart remember to be so so easy !! Hahaha…