python - 如何更改日期时间分辨率

Question

有没有一种简单的方法可以说明

a = '2020-01-01 19:30:33.996628' 
b = '2020-01-01 19:30:34' 

a和 b是平等的。如果时间分辨率为 a改为第二，然后 a可以等于 b .如何用代码实现？

Answer 1

带四舍五入

添加 timedelta 1e6 和 a.microsecond 之间的区别

from datetime import timedelta, datetime

a = datetime.fromisoformat('2020-01-01 19:30:33.996628')

a = a + timedelta(microseconds=(1e6 - a.microsecond))

print(a)

>>> datetime.datetime(2020, 1, 1, 19, 30, 34)

print(a.strftime('%Y-%m-%d %H:%M:%S'))

>>> 2020-01-01 19:30:34

与 .replace(microsecond=0)

from datetime import datetime

a = datetime.fromisoformat('2020-01-01 19:30:33.996628')

print(a)

>>> datetime.datetime(2020, 1, 1, 19, 30, 33, 996628)

a = a.replace(microsecond=0)

print(a)

>>> datetime.datetime(2020, 1, 1, 19, 30, 33)