Gregorian month.
interface gregorian month
Declaration: gregorian month
Announcements: gregorian month
Direct subtypes: base gregorian month
Use: gregorian day
Index base 1 (January is 1, February is 2, and so on.)
nonnegative index base 1
Declaration: index base 1
Minimum number of days in the month (31 in January, 28 in February, etc.)
nonnegative min days
Declaration: min days
Maximum number of days in the month (31 in January, 29 in February, etc.)
The only difference between min_days and max_days os for February.
nonnegative max days
Declaration: max days