Python基础学习之时间转换函数用法详解

时间:2022-09-13 23:19:15

本文实例讲述了python基础学习之时间转换函数用法。分享给大家供大家参考,具体如下:

前言

python的时间格式分为多种,几种格式之间的转换方法时常是我们遇到的而且是经常忘记的点,python不像php,时间字符串和datetime是一起的,只需要strtotime和date函数就可以相互转化。虽然网上已经有很多python时间转换的文章,但是由于作者本人经常做海外业务,需要各种时区之间的转换,所以这篇文章会对按时区转换各种时间格式做一个总结。

转换方法图示(图片转自网络):

Python基础学习之时间转换函数用法详解

一、字符串转时间戳

1、默认:

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import time
def time_str_to_timestamp(string_time, _format="%y-%m-%d %h:%m:%s"):
  return int(time.mktime(time.strptime(string_time, _format)))

2、按时区转:

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import time
import datetime
from pytz import timezone as tz
def time_str_to_timestamp_by_timezone(string_time, _format="%y-%m-%d %h:%m:%s”, from_tz=“utc”, to_tz="america/los_angeles"):
  from_tz = tz(from_tz)
  to_tz = tz(to_tz)
  return int(time.mktime(
    datetime.datetime.strptime(string_time, _format).replace(
      tzinfo=from_tz).astimezone(to_tz).timetuple()))

二、时间戳转字符串

1、默认:

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import time
def timestamp_to_str(timestamp, _format="%y-%m-%d %h:%m:%s"):
  return time.strftime(_format, time.localtime(timestamp))

2、按时区转:

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import datetime
from pytz import timezone as tz
def timestamp_to_str_by_timezone(timestamp, _format="%y-%m-%d %h:%m:%s”, to_tz="america/los_angeles"):
  to_tz = tz(to_tz)
  return str(datetime.datetime.fromtimestamp(timestamp, to_tz).strftime(_format))

三、字符串转datetime

1、默认:

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import datetime
def datetime_str_to_datetime(string_time, _format="%y-%m-%d %h:%m:%s"):
  return datetime.datetime.strptime(string_time, _format)

2、按时区转:

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import datetime
from pytz import timezone as tz
def datetime_str_to_datetime_by_timezone(string_time, from_tz=“utc”, to_tz="america/los_angeles”, _format="%y-%m-%d %h:%m:%s",):
  from_tz = tz(from_tz)
  to_tz = tz(to_tz)
  return datetime.datetime.strptime(string_time, _format).replace(
        tzinfo=from_tz).astimezone(to_tz)

四、datetime转字符串

1、默认:

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import datetime
def datetime_to_datetime_str(date, _format="%y-%m-%d %h:%m:%s"):
  return date.strftime(_format)

2、按时区转:

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import datetime
from pytz import timezone as tz
def datetime_to_datetime_str_by_timezone(date, from_tz=“utc”, to_tz="america/los_angeles”, _format="%y-%m-%d %h:%m:%s"):
  from_tz = tz(from_tz)
  to_tz = tz(to_tz)
  date = date.replace(tzinfo=from_tz).astimezone(to_tz)
  return date.strftime(_format)

五、datetime转时间戳

1、默认:

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import time
def datetime_to_timestamp(date):
  return int(time.mktime(date.timetuple()))

2、按时区转:

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import time
from pytz import timezone as tz
def datetime_to_timestamp_by_timezone(date, from_tz=“utc”, to_tz="america/los_angeles"):
  from_tz = tz(from_tz)
  to_tz = tz(to_tz)
  return int(time.mktime(date.replace(
      tzinfo=from_tz).astimezone(to_tz).timetuple()))

六、时间戳转datetime

1、默认:

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import datetime
def timestamp_to_datetime(time_stamp):
  return datetime.datetime.fromtimestamp(time_stamp)

2、按时区转:

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import datetime
from pytz import timezone as tz
def timestamp_to_datetime_by_timezone(time_stamp, to_tz="america/los_angeles"):
  to_tz = tz(to_tz)
  return datetime.datetime.fromtimestamp(time_stamp, to_tz)

ps:这里再为大家推荐几款关于日期与天数计算的在线工具供大家使用:

unix时间戳(timestamp)转换工具:https://tool.zzvips.com/t/timestamp/

希望本文所述对大家python程序设计有所帮助。

原文链接:https://blog.csdn.net/dream_successor/article/details/90295343