date property

PersianDate date

Computes the offset from the first day of week that the first day of the month falls on.

For example, September 1, 2017 falls on a Friday, which in the calendar localized for United States English appears as:

S M T W T F S
_ _ _ _ _ 1 2

The offset for the first day of the months is the number of leading blanks in the calendar, i.e. 5.

The same date localized for the Russian calendar has a different offset, because the first day of week is Monday rather than Sunday:

M T W T F S S
_ _ _ _ 1 2 3

So the offset is 4, rather than 5.

This code consolidates the following:

• DateTime.weekday provides a 1-based index into days of week, with 1 falling on Monday.
• MaterialLocalizations.firstDayOfWeekIndex provides a 0-based index into the MaterialLocalizations.narrowWeekdays list.
• MaterialLocalizations.narrowWeekdays list provides localized names of days of week, always starting with Sunday and ending with Saturday.

Implementation

final PersianDate date = PersianDate.pDate();