epoch2datevec(tle_e​poch)

This code gives you the date vector for a given epoch of Two Line Element (TLE)data.

Two Line Elements(TLE) gives you the list of orbital elements of satellites for a given point in time called epoch.
As a example TLE epoch time is like 17139.35505097, first two digits for the year 17 mean 2017
139 mean the day of the year .35505097 is the fractional day from midnight