<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def fromPOSIXTimestamp(klass, secs):
 """Return a new Time instance from seconds since the POSIX epoch. The POSIX epoch is midnight Jan 1, 1970 UTC. According to POSIX, leap seconds don't exist, so one UTC day is exactly 86400 seconds, even if it wasn't. @param secs: a number of seconds, represented as an integer, long or float. """

        self = klass.fromDatetime(_EPOCH + datetime.timedelta(seconds=secs))
        self.resolution = datetime.timedelta()
        return self