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It is a fun fact that you can now find birth date to anyone by simple math and you can surprised them. So let's learn the strategy.
Now tell the person to complete some task but do not show to you.

1. First, tell him to "multiply your date of birth by 20" (eg, if someone's date of birth is 17 then 17 * 20 = 340)
2. Then say "add 73 with the ammount." (Eg 340 + 73 = 413)
3. Now say "multiply the sum by 5". (For example, 413 * 5 = 2065)
4. Then say, "Add the number of months in which month he was born with the sum, such as January 1, June 6. (Eg 2065 + 7 = 2072) Now you will only to ask the latest results.
   Then the secret that you have to do is to subtract 365 from that result. (E.g., 2072-365 = 1707)
   Now the answer you received will be the first two digits from the right of the month and the next one or two digits will be the date. (For example, in my example the answer was 1707, so the date of birth would be 07 = July is the month and 17 is the date, therefore, on the 17th of July.)

If the answer is 310, the birth date will be 3 October, 504, the date of birth will be April 5th. So the first two digits from the right will be the month and the next one or two digits will be the date.

Thanks to all.
Upvote and resteem and keep following for more tips.