Today is March 14. That's exactly one month after Valentine's Day and if you are in Japan, South Korea, Taiwan or China, you know exactly what that means.
It's White Day.
Since in the countries above, Valentine's Day is a holiday where women give chocolates, or other gifts to men, White Day is the when men reciprocate the kindness.
Traditionally, popular White Day gifts are cookies, jewelry, white chocolate, white lingerie and marshmallows.
Sometimes the term sanbai gaeshi (literally, "triple the return") is used to describe the generally recited rule that the return gift should be two to three times the cost of the Valentine's gift.
If you are not really into that, you can celebrate another holiday.
Today is also Pi Day, a holiday commemorating the mathematical constant π (pi).