将字符串日期转换为时间戳并返回python

Question

您好我正在尝试从jquery UI获取日期输入并将其作为时间戳处理并作为时间戳进行读取.我知道我可能需要使用strftime但无法弄清楚如何做到这一点.

日期以MM/DD/YYYY表示

我想将它转换为时间戳,并在选择查询后将其返回到MM/DD/YYYY

Answer 1

要将字符串解析为datetime.datetime对象:

In [23]: import datetime
In [29]: datetime.datetime.strptime('9/1/2011','%m/%d/%Y')
Out[29]: datetime.datetime(2011, 9, 1, 0, 0)

下面是一个描述如何在Python中完成datetime/timetuple/timestamp转换的小图:

         o------------o
         |            |  dt.datetime.utcfromtimestamp (*)
         |            |<-----------------------------------o 
         |            |                                    |
         |  datetime  |                                    |
         |            |  dt.datetime.fromtimestamp         |
         |            |<----------------------------o      |
         |            |                             |      |
         o------------o                             |      |
            |   ^                                   |      |
 .timetuple |   |                                   |      |
            |   | dt.datetime(*tup[:6])             |      |
            v   |                                   |      |
         o------------o                          o------------o
         |            |-- calendar.timegm (*) -->|            |
         |            |                          |            |
         |            |---------- time.mktime -->|            |
         |  timetuple |                          |  timestamp |
         |            |<-- time.localtime -------|            |
         |            |                          |            |
         |            |<-- time.gmtime (*)-------|            |
         o------------o                          o------------o

(*) Interprets its input as being in UTC and returns output in UTC

因此,要将其转换为时间戳(将输入视为本地日期时间):

In [30]: import time

In [31]: time.mktime(datetime.datetime.strptime('9/1/2011','%m/%d/%Y').timetuple())
Out[31]: 1314849600.0

要将其转换为时间戳(将输入视为UTC日期时间):

In [32]: import calendar

In [33]: calendar.timegm(datetime.datetime.strptime('9/1/2011','%m/%d/%Y').timetuple())
Out[33]: 1314835200

要将其转换回MM/DD/YYYY格式的字符串:

In [34]: timestamp=1314849600.0
In [35]: datetime.datetime.fromtimestamp(timestamp).strftime('%m/%d/%Y')
Out[35]: '09/01/2011'

或(如果时间戳是相对于UTC):

In [36]: datetime.datetime.utcfromtimestamp(timestamp).strftime('%m/%d/%Y')
Out[36]: '09/01/2011'