Introduction - If you have any usage issues, please Google them yourself
Inauspicious date: Function: In other countries, on the 13th of each month and day of the week 5 are unlucky. Especially when on the 13th day of the week 5:00 exactly, but unlucky. Known
January 1 of a given year is the week W, and this is certainly not a leap year, calculated on the 13th day of the year is the month for all five weeks, according to childhood
The order of the output to large number of the month. (W = 1..7),