Use datetime.utcfromtimestamp instead of first using gmtime in CTime.datetime

[JHolba]

This makes datetime run about 10% faster.

measured using this python code

import timeit

runtime = timeit.timeit(
    "time_map = [t.datetime() for t in c_time]",
    "from ecl.summary import EclSum;"
    'summary = EclSum("/home/jholba/Downloads/BIGPOLY",include_restart=False,lazy_load=False);'
    "c_time = summary.alloc_time_vector(True)",
    number=100,
)

print(runtime)

[berland]

Maybe not measurably faster, but by inlining self.ctime() to self.value() you should save a function call.

[pinkwah]

Stale?