原則, 以datetime為中心, 起點或中轉(zhuǎn), 轉(zhuǎn)化為目標(biāo)對象, 涵蓋了大多數(shù)業(yè)務(wù)場景中需要的日期轉(zhuǎn)換處理

步驟:

1. 掌握幾種對象及其關(guān)系

2. 了解每類對象的基本操作方法

3. 通過轉(zhuǎn)化關(guān)系轉(zhuǎn)化

涉及對象

1. datetime

>>> import datetime

>>> now = datetime.datetime.now()

>>> now

datetime.datetime(2015, 1, 12, 23, 9, 12, 946118)

>>> type(now)

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(2015, 1, 12)

datetime基本操作

1. 獲取當(dāng)前datetime

>>> import datetime

>>> datetime.datetime.now()

datetime.datetime(2015, 1, 12, 23, 26, 24, 475680)

2. 獲取當(dāng)天date

>>> datetime.date.today()

datetime.date(2015, 1, 12)

3. 獲取明天/前N天

明天

>>> datetime.date.today() + datetime.timedelta(days=1)

datetime.date(2015, 1, 13)

三天前

>>> datetime.datetime.now()

datetime.datetime(2015, 1, 12, 23, 38, 55, 492226)

>>> datetime.datetime.now() - datetime.timedelta(days=3)

datetime.datetime(2015, 1, 9, 23, 38, 57, 59363)

4. 獲取當(dāng)天開始和結(jié)束時間(00:00:00 23:59:59)

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

datetime.datetime(2015, 1, 12, 0, 0)

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

datetime.datetime(2015, 1, 12, 23, 59, 59, 999999)

5. 獲取兩個datetime的時間差

>>> (datetime.datetime(2015,1,13,12,0,0) - datetime.datetime.now()).total_seconds()

44747.768075

6. 獲取本周/本月/上月最后一天

本周

>>> today = datetime.date.today()

>>> today

datetime.date(2015, 1, 12)

>>> sunday = today + datetime.timedelta(6 - today.weekday())

>>> sunday

datetime.date(2015, 1, 18)

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(2015, 1, 31)

獲取上個月的最后一天(可能跨年)

>>> import datetime

>>> today = datetime.date.today()

>>> first = datetime.date(day=1, month=today.month, year=today.year)

>>> lastMonth = first - datetime.timedelta(days=1)

關(guān)系轉(zhuǎn)換

幾個關(guān)系之間的轉(zhuǎn)化

Datetime Object / String / timestamp / time tuple

關(guān)系轉(zhuǎn)換例子

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(2014, 12, 31, 18, 20, 10)

datetime <=> timetuple

datetime -> timetuple

>>> import datetime

>>> datetime.datetime.now().timetuple()

time.struct_time(tm_year=2015, tm_mon=1, tm_mday=12, tm_hour=23, tm_min=17, tm_sec=59, tm_wday=0, tm_yday=12, tm_isdst=-1)

timetuple -> datetime

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

datetime <=> date

datetime -> date

>>> import datetime

>>> datetime.datetime.now().date()

datetime.date(2015, 1, 12)

date -> datetime

>>> datetime.date.today()

datetime.date(2015, 1, 12)

>>> today = datetime.date.today()

>>> datetime.datetime.combine(today, datetime.time())

datetime.datetime(2015, 1, 12, 0, 0)

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

datetime.datetime(2015, 1, 12, 0, 0)

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(2015, 1, 12, 23, 43, 23)

總結(jié)

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