def remove_elevation(self):
        for segment in self.segments:
            segment.remove_elevation()
Converts a time in usec since the epoch to seconds since the epoch.
dataset/ETHPy150Open tkrajina/gpxpy/gpxpy/gpx.py/GPXTrack.remove_elevation--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/taskqueue/taskqueue_stub.py/_UsecToSec