python datetime计算及timestamp、string转换

1.datetime计算

import datetime
# 当前时间
datetime.datetime.now()
# 当前时间+3天
datetime.datetime.now() + datetime.timedelta(+3)
# 当前时间-3天
datetime.datetime.now() + datetime.timedelta(-3)
# 当前时间+3小时
datetime.datetime.now() + datetime.timedelta(hours=3)

2.datetime、timestamp以及string转换

# 当前时间
now = datetime.datetime.now()
# datetime转timestamp
now.timestamp()
# datetime转string
now.strftime('%Y-%m-%d %H:%M:%S')
# timestamp转换成datetime
datetime.date.fromtimestamp(1178766678)
# string转datetime
# 日期时间字符串
st = "2020-05-06 10:00:00"
datetime.datetime.strptime(st, "%Y-%m-%d %H:%M:%S")