From Gustavo Cassab:
Other day i wanted to know what day of the week I was born. It would be a Monday? may be Sunday ?
I tried, in my iPhone, to have this information, but i did not found a way, unless, through the calendar, change month to month, until the desired date, which was impracticable; because that would be tens of months.
The iPhone doesn't do that?? Now is ...
Know what day of the week at any time, practically and quickly.
Off-line, it's not necessaary connection to the Internet.