python 时间差的计算

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本文介绍了如何使用Python的datetime模块进行日期和时间的操作，包括获取当前时间、计算时间间隔、向前或向后推算日期等实用技巧。

import time
import datetime

start = datetime.datetime.now()
time.sleep(30)
end = datetime.datetime.now()

print (end-start).days # 0 天数
print (end-start).total_seconds() # 30.029522 精确秒数
print (end-start).seconds # 30 秒数
print (end-start).microseconds # 29522 毫秒数

import datetime

now = datetime.datetime.now()
three_days_ago = now + datetime.timedelta(days=-3)
three_weeks_ago = now + datetime.timedelta(weeks=-3)

print now # datetime.datetime(2016, 12, 22, 11, 24, 49, 987171)
print three_days_ago # datetime.datetime(2016, 12, 19, 11, 24, 49, 987171)
print three_weeks_ago # datetime.datetime(2016, 12, 1, 11, 24, 49, 987171)

import datetime

now = datetime.datetime.now()
three_days_later = now + datetime.timedelta(days=3)
three_weeks_later = now + datetime.timedelta(weeks=3)

print now # datetime.datetime(2016, 12, 22, 11, 24, 49, 987171)
print three_days_later # datetime.datetime(2016, 12, 25, 11, 24, 49, 987171)
print three_weeks_later # datetime.datetime(2017, 1, 12, 11, 24, 49, 987171)