Introduction - If you have any usage issues, please Google them yourself
This procedure used the formula for calculating the calendar: d = a-1+ (A-1)/4- (a-1)/100+ (A-1)/400+ C for the year in which a date for the c in this years the number of days, d take integer, when the d/7 more than a few Sundays 0:00, 1:00 is more than a few on Monday, and so on.