getDay: Get the day in a month (in a year) from days elapsed since 01-01-1970
Description
Function computes from days elapsed since 01-01-1970 the day in a month (in a year).
Usage
getDay(daysSince01011970)
Value
Day in a month (in a year) computed from days elapsed since 01-01-1970
Arguments
- daysSince01011970
Days elapsed since 1970-01-01