remove misleading "in UTC" (#1882)

"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:

```python
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.

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