Question

How to calculate the date and day of today that was exactly on previous year on the same date and on same day?​

Answer 1

Here is a standard method suitable for mental computation:

• Take the last two digits of the year.
• Divide by 4, discarding any fraction.
• Add the day of the month.
• Add the month's key value: JFM AMJ JAS OND 144 025 036 146.
• Subtract 1 for January or February of a leap year.