remove misleading "in UTC"

[zed]

"seconds since the epoch" (value returned by time.time()) doesn't
depend on the local time zone. It is the same time instance around the
world. It is not in any particular time zone:

import datetime as DT
import zoneinfo

local_time = DT.datetime.fromtimestamp(seconds_since_epoch)    # naive datetime object representing local time
utc_time = DT.datetime.utcfromtimestamp(seconds_since_epoch)  # naive datetime object representing utc time
la_time = DT.datetime.fromtimestamp(seconds_since_epoch, zoneinfo.ZoneInfo("America/Los_Angeles"))   # timezone aware dt

Here local_time, utc_time, la_time may correspond to different
clock times but it is exactly the same time instance.