>>> test = time.time()
>>> print(test)
1561378571.5154927
>>> time.ctime(test)
'Mon Jun 24 14:16:11 2019'
>>> test_after_N = test + 10**9 * 24 * 3600
>>> print(test_after_N)
86401561378571.52
>>> time.ctime(test_after_N)
'Sun Jun 27 13:16:11 2739926'