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February 12, the twelfth day of the first lunar month.

Today is April 3rd, March has 3 1 day, February has 28 days, 50 minus 34 equals 16 days, and 28 minus 16 equals 12, so 50 days ago was February 12.

To calculate this kind of problem, you need to know how many days there are in a month. The number of days in a month has a jingle: 135780 wax (65438+February), 3 1 day is never bad; April 30th (165438+1October); February 28th in normal year, plus February 1 day in leap year.

The number of days in a month is: January, February, March, April, May, June, July, August, September, October, November and December.