Python实用日期时间处理方法汇总

这篇文章主要介绍了Python实用日期时间处理方法汇总,本文讲解了获取当前datetime、获取当天date、获取明天/前N天、获取当天开始和结束时间(00:00:00 23:59:59)、获取两个datetime的时间差、获取本周/本月/上月最后一天等实用方法 ,需要的朋友可以参考下

原则, 以datetime为中心, 起点或中转, 转化为目标对象, 涵盖了大多数业务场景中需要的日期转换处理

步骤:

1. 掌握几种对象及其关系
2. 了解每类对象的基本操作方法
3. 通过转化关系转化
涉及对象

1. datetime

>>> import datetime
>>> now = datetime.datetime.now()
>>> now
datetime.datetime(, , , , , , )
>>> type(now)
<type 'datetime.datetime'>

2. timestamp

>>> import time
>>> time.time()
1421075455.568243

3. time tuple

>>> import time
>>> time.localtime()
time.struct_time(tm_year=2015, tm_mon=1, tm_mday=12, tm_hour=23, tm_min=10, tm_sec=30, tm_wday=0, tm_yday=12, tm_isdst=0)

4. string

>>> import datetime
>>> datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
'2015-01-12 23:13:08'

5. date

>>> import datetime
>>> datetime.datetime.now().date()
datetime.date(, , )

datetime基本操作

1. 获取当前datetime

>>> import datetime
>>> datetime.datetime.now()
datetime.datetime(, , , , , , )

2. 获取当天date

>>> datetime.date.today()
datetime.date(, , )

3. 获取明天/前N天

明天

>>> datetime.date.today() + datetime.timedelta(days=)
datetime.date(, , )

三天前

>>> datetime.datetime.now()
datetime.datetime(, , , , , , )
>>> datetime.datetime.now() - datetime.timedelta(days=)
datetime.datetime(, , , , , , )

4. 获取当天开始和结束时间(00:00:00 23:59:59)

>>> datetime.datetime.combine(datetime.date.today(), datetime.time.min)
datetime.datetime(, , , , )
>>> datetime.datetime.combine(datetime.date.today(), datetime.time.max)
datetime.datetime(, , , , , , )

5. 获取两个datetime的时间差

>>> (datetime.datetime(,,,,,) - datetime.datetime.now()).total_seconds()
44747.768075

6. 获取本周/本月/上月最后一天

本周

>>> today = datetime.date.today()
>>> today
datetime.date(, , )
>>> sunday = today + datetime.timedelta( - today.weekday())
>>> sunday
datetime.date(, , )

本月

>>> import calendar
>>> today = datetime.date.today()
>>> _, last_day_num = calendar.monthrange(today.year, today.month)
>>> last_day = datetime.date(today.year, today.month, last_day_num)
>>> last_day
datetime.date(, , )

获取上个月的最后一天(可能跨年)

>>> import datetime
>>> today = datetime.date.today()
>>> first = datetime.date(day=, month=today.month, year=today.year)
>>> lastMonth = first - datetime.timedelta(days=)

关系转换

几个关系之间的转化

Datetime Object / String / timestamp / time tuple

关系转换例子

datetime <=> string

datetime -> string

>>> import datetime
>>> datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
'2015-01-12 23:13:08'

string -> datetime

>>> import datetime
>>> datetime.datetime.strptime("2014-12-31 18:20:10", "%Y-%m-%d %H:%M:%S")
datetime.datetime(, , , , , )

datetime <=> timetuple

datetime -> timetuple

>>> import datetime
>>> datetime.datetime.now().timetuple()
time.struct_time(tm_year=, tm_mon=, tm_mday=, tm_hour=, tm_min=, tm_sec=, tm_wday=, tm_yday=, tm_isdst=-)

timetuple -> datetime

timetuple => timestamp => datetime [看后面datetime<=>timestamp]

datetime <=> date

datetime -> date

>>> import datetime
>>> datetime.datetime.now().date()
datetime.date(, , )

date -> datetime

>>> datetime.date.today()
datetime.date(, , )
>>> today = datetime.date.today()
>>> datetime.datetime.combine(today, datetime.time())
datetime.datetime(, , , , )
>>> datetime.datetime.combine(today, datetime.time.min)
datetime.datetime(, , , , )

datetime <=> timestamp

datetime -> timestamp

>>> now = datetime.datetime.now()
>>> timestamp = time.mktime(now.timetuple())
>>> timestamp
1421077403.0

timestamp -> datetime

>>> datetime.datetime.fromtimestamp(1421077403.0)
datetime.datetime(, , , , , )