There is not a symmetry day every year, but once every ten years. Symmetry day refers to the date when the numbers are completely symmetrical in the calendar year, which only exists in the four-digit era, that is, between 1 and 9999. According to the calculation, the first symmetrical day after the calendar year is 10 1 year 10, that is, 0 1010, followed by 20200202 and 20260. And the last symmetry day will appear on September 29th, 9290, which is 92900929.

There is not a symmetry day every year, but once every ten years. Symmetry day refers to the date when the numbers are completely symmetrical in the calendar year, which only exists in the four-digit era, that is, between 1 and 9999. According to the calculation, the first symmetrical day after the calendar year is 10 1 year 10, that is, 0 1010, followed by 20200202 and 20260. And the last symmetry day will appear on September 29th, 9290, which is 92900929.