Introduction - If you have any usage issues, please Google them yourself
1 Given a date, can be calculated from the specified base date (by the teacher specify) the number of days and days of the week 2 given at the specified base date (by the teacher specify) the number of days, can calculate the exact date and day of week few 3. should distinguish non-leap year and leap year, month, and Satsuki big distinction, the distinction between February is 28 days or 29 days.