convert_decimal_to_date.py

from unittest import TestCase

import datetime

def d2t(t):
    h = int(t)
    m = (t * 60) % 60
    s = (t * 3600) % 60
    a = map(lambda x: int(x), [h, m, s])
    return datetime.time(*a)

class D2TTestCase(TestCase):

    def test_d2t(self):
        self.assertEqual(datetime.time(1,0), d2t(1.0))
        self.assertEqual(datetime.time(23, 27), d2t(23.450))

if __name__ == "__main__":
    unittest.main()