摘要：可以使用進(jìn)行加減，得到一個(gè)對(duì)象也支持兩個(gè)時(shí)間比較提供多種方法獲取一個(gè)指定的時(shí)間，如明年或者下周三提供了一些方便的方法進(jìn)行如上操作。提供了很方便的方法按照微妙秒分鐘小時(shí)進(jìn)行過濾同樣，也支持按照年月份字符串處理另一個(gè)麻煩事是處理格式的字符串。

navie datetime:沒有指定時(shí)區(qū)的datetime對(duì)象

localized datetime:指定時(shí)區(qū)的datetime對(duì)象

localizing:指定市區(qū)的的navie datetime

normalizing:datetime時(shí)區(qū)切換

首先，導(dǎo)入Delorean

*>>> from delorean import Delorean

使用UTC格式的當(dāng)前時(shí)間創(chuàng)建一個(gè)datetime

*>>> d = Delorean()
*>>> d
Delorean(datetime=datetime.datetime(2013, 1, 12, 6, 10, 33, 110674),  timezone="UTC")

簡(jiǎn)單的時(shí)區(qū)切換

*>>> d = d.shift("US/Eastern")
*>>> d
Delorean(datetime=datetime.datetime(2013, 1, 12, 1, 10, 38, 102223), timezone="US/Eastern")

轉(zhuǎn)換成datetime看看

*>>> d.datetime
datetime.datetime(2013, 1, 12, 01, 10, 38, 102223, tzinfo=)
*>>> d.date
datetime.date(2013, 1, 12)

單純的輸入時(shí)間看看

*>>> d.naive()
datetime.datetime(2013, 1, 12, 1, 10, 38, 102223)
*>>> d.epoch()
1357971038.102223

也是用unix時(shí)間戳初始化Delorean

*>>> from delorean import epoch
*>>> epoch(1357971038.102223).shift("US/Eastern")
Delorean(datetime=datetime.datetime(2013, 1, 12, 1, 10, 38, 102223), timezone="US/Eastern")

初始化后，就可以方便的切換到自己所需的時(shí)區(qū)
Delorean也可以使用指定的datetime對(duì)象進(jìn)行初始化，Delorean會(huì)自動(dòng)處理時(shí)區(qū)和時(shí)間

*>>> tz = timezone("US/Pacific")
*>>> dt = tz.localize(datetime.utcnow())
datetime.datetime(2013, 3, 16, 5, 28, 11, 536818, tzinfo=)
*>>> d = Delorean(datetime=dt)
*>>> d
Delorean(datetime=datetime.datetime(2013, 3, 16, 5, 28, 11, 536818), timezone="US/Pacific")
*>>> d = Delorean(datetime=dt, timezone="US/Eastern")
*>>> d
Delorean(datetime=datetime.datetime(2013, 3, 16, 5, 28, 11, 536818), timezone="US/Pacific")

Delorean支持timedelta的時(shí)間加減法。Delorean可以使用timedelta進(jìn)行加減，得到一個(gè)Delorean對(duì)象

*>>> d = Delorean()
*>>> d
Delorean(datetime=datetime.datetime(2014, 6, 3, 19, 22, 59, 289779), timezone="UTC")
*>>> d += timedelta(hours=2)
*>>> d
Delorean(datetime=datetime.datetime(2014, 6, 3, 21, 22, 59, 289779), timezone="UTC")
*>>> d - timedelta(hours=2)
Delorean(datetime=datetime.datetime(2014, 6, 3, 19, 22, 59, 289779), timezone="UTC")
*>>> d2 = d + timedelta(hours=2)
*>>> d2 - d
datetime.timedelta(0, 7200)

Delorean也支持兩個(gè)時(shí)間比較

*>>> d1 = Delorean(datetime(2015, 1, 1), timezone="US/Pacific")
*>>> d2 = Delorean(datetime(2015, 1, 1, 8), timezone="UTC")
*>>> d1 == d2
True

Delorean提供多種方法獲取一個(gè)指定的時(shí)間，如明年或者下周三
Delorean提供了一些方便的方法進(jìn)行如上操作。

*>>> d = Delorean()
*>>> d
Delorean(datetime=datetime.datetime(2013, 1, 20, 19, 41, 6, 207481), timezone="UTC")
*>>> d.next_tuesday()
Delorean(datetime=datetime.datetime(2013, 1, 22, 19, 41, 6, 207481), timezone="UTC")

上周二、過去第二個(gè)周二午夜

*>>> d.last_tuesday()
Delorean(datetime=datetime.datetime(2013, 1, 15, 19, 41, 6, 207481), timezone="UTC")
*>>> d.last_tuesday(2).midnight()
datetime.datetime(2013, 1, 8, 0, 0, tzinfo=)

通常情況下我們不關(guān)心有多少微妙或者多少秒。例如，我們很難區(qū)別同一分鐘的兩個(gè)datetime對(duì)象。我們補(bǔ)習(xí)吧不關(guān)心的字段設(shè)置為0。
Delorean提供了很方便的方法按照微妙、秒、分鐘、小時(shí)進(jìn)行過濾

*>>> d = Delorean()
*>>> d
Delorean(datetime=datetime.datetime(2013, 1, 21, 3, 34, 30, 418069), timezone="UTC")
*>>> d.truncate("second")
Delorean(datetime=datetime.datetime(2013, 1, 21, 3, 34, 30), timezone="UTC")
*>>> d.truncate("hour")
Delorean(datetime=datetime.datetime(2013, 1, 21, 3, 0), timezone="UTC")

同樣，也支持按照年、月份

*>>> d = Delorean(datetime=datetime(2012, 5, 15, 03, 50, 00, 555555), timezone="US/Eastern")
*>>> d
Delorean(datetime=datetime.datetime(2012, 5, 15, 3, 50, 0, 555555), timezone="US/Eastern")
*>>> d.truncate("month")
Delorean(datetime=datetime.datetime(2012, 5, 1), timezone="US/Eastern")
*>>> d.truncate("year")

Delorean(datetime=datetime.datetime(2012, 1, 1), timezone="US/Eastern")

另一個(gè)麻煩事是處理datetime格式的字符串。Delorean可以很方便的處理

*>>> from delorean import parse
*>>> parse("2011/01/01 00:00:00 -0700")
Delorean(datetime=datetime.datetime(2011, 1, 1, 7), timezone="UTC")    

Delorean提供了兩個(gè)字段dayfirst=True and yearfirst=True用來處理相應(yīng)格式的字符串，如果dayfirst和yearfirst是True

YY-MM-DD

DD-MM-YY

MM-DD-YY

默認(rèn)情況下，對(duì)于May 6th, 2013格式，Delorean返回‘2013-05-06

*>>> parse("2013-05-06")
Delorean(datetime=datetime.datetime(2013, 5, 6), timezone="UTC")

dayfirst和yearfirst的配置如下：

如果dayfirst是False，yearfirst是False

MM-DD-YY

DD-MM-YY

YY-MM-DD

如果dayfirst是True，yearfirst是False

DD-MM-YY

MM-DD-YY

YY-MM-DD

如果dayfirst是False，yearfirst是True

YY-MM-DD

MM-DD-YY

DD-MM-YY

*>>> import delorean
*>>> from delorean import stops
*>>> for stop in stops(freq=delorean.HOURLY, count=10):    print stop
...
Delorean(datetime=datetime.datetime(2013, 1, 21, 6, 25, 33), timezone="UTC")
Delorean(datetime=datetime.datetime(2013, 1, 21, 7, 25, 33), timezone="UTC")
Delorean(datetime=datetime.datetime(2013, 1, 21, 8, 25, 33), timezone="UTC")
Delorean(datetime=datetime.datetime(2013, 1, 21, 9, 25, 33), timezone="UTC")
Delorean(datetime=datetime.datetime(2013, 1, 21, 10, 25, 33), timezone="UTC")
Delorean(datetime=datetime.datetime(2013, 1, 21, 11, 25, 33), timezone="UTC")
Delorean(datetime=datetime.datetime(2013, 1, 21, 12, 25, 33), timezone="UTC")
Delorean(datetime=datetime.datetime(2013, 1, 21, 13, 25, 33), timezone="UTC")
Delorean(datetime=datetime.datetime(2013, 1, 21, 14, 25, 33), timezone="UTC")
Delorean(datetime=datetime.datetime(2013, 1, 21, 15, 25, 33), timezone="UTC")

注意：stops只接受naive datetime
可以指定開始和結(jié)束的時(shí)間

*>>> for stop in stops(freq=delorean.DAILY, count=10, timezone="US/Eastern", start=d1, stop=d2):    print stop
...
Delorean(datetime=datetime.datetime(2012, 5, 6), timezone="US/Eastern")
Delorean(datetime=datetime.datetime(2012, 5, 7), timezone="US/Eastern")
Delorean(datetime=datetime.datetime(2012, 5, 8), timezone="US/Eastern")
Delorean(datetime=datetime.datetime(2012, 5, 9), timezone="US/Eastern")
Delorean(datetime=datetime.datetime(2012, 5, 10), timezone="US/Eastern")
Delorean(datetime=datetime.datetime(2012, 5, 11), timezone="US/Eastern")
Delorean(datetime=datetime.datetime(2012, 5, 12), timezone="US/Eastern")
Delorean(datetime=datetime.datetime(2012, 5, 13), timezone="US/Eastern")
Delorean(datetime=datetime.datetime(2012, 5, 14), timezone="US/Eastern")
Delorean(datetime=datetime.datetime(2012, 5, 15), timezone="US/Eastern")

只指定結(jié)束時(shí)間是不行的

*>>> for stop in stops(freq=delorean.DAILY, timezone="US/Eastern", stop=d2):    print stop
...
Traceback (most recent call last):
    File "", line 1, in