20 17 12/03 is the lunar calendar date.

According to the perpetual calendar, February 3rd of 20 17 is February 3rd of 20 17, 10 and 16 of the lunar calendar. The Gregorian calendar, also known as the Gregorian calendar, is based on the law of the earth's movement around the sun. The lunar calendar is also called the lunar calendar. It is a calendar based on the law of the moon's orbit around the earth (that is, the change of the moon's phase profit and loss), and at the same time, it takes into account the law of the earth's orbit around the sun (that is, a year is adjusted according to leap months), so it is also called the solar calendar.