How to handle datetime in Django (strftime/strptime)

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Release: 2023-04-02 08:46:01
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This article mainly introduces the processing method of datetime in Django (strftime/strptime). This article introduces you in very detail and has certain reference value. Friends in need can refer to it

strftime

The strftime() function is a function used to format a date, date time and time. Supports date, datetime, time and other classes, and formats these times as strings through format characters.

import datatime
datatime.datatime.now()
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or

from datatime import datatime
datatime.now()
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My output conversion format

strftime('%Y-%m-%d %H:%I:%S')

The effect is similar to 2018-07-02 23:18:20.

strptime

The strptime() function is to convert the date and time represented by a string into the corresponding date and time according to the format string requirements.

d2 = datetime.strptime('2018-03-02 17:41:20', '%Y-%m-%d %H:%M:%S')
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Format of conversion comparison:

Convert to string

%y Two-digit year representation (00-99)
%Y four Number of digits representing the year (000-9999)
%m Month (01-12)
%d Day in the month (0-31)
%H Number of hours in 24-hour format (0-23 )
%I Hours in 12-hour format (01-12) Twelve-hour format
%M Minutes (00=59)
%S Seconds (00-59)

Two bugs encountered:

One: The display time is inconsistent with the database bug:

Once I encountered such a problem, the time taken out from the database was inconsistent with the time displayed on the front end. Later, after outputting more information and converting the time, I finally found out that the colleague who wrote the code before used this

one['time'] = one['time'].strftime('%Y-%m-%d %H:%I:%S')
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%I is the conversion form of the twelve-hour clock. When converting the format in this way, although no error will be reported, the output result will be inconsistent with the database. The database records time in 24-hour units.

Two: datetime.datetime(2018, 2, 2, 18, 25, 29, tzinfo=<UTC>) is not JSON serializable

Such an error message appears ..

datetime.datetime(2018, 2, 2, 18, 25, 29, tzinfo=<UTC>) is not JSON serializable
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This is the error message that appears when datetime data is placed directly in json. It cannot be placed directly in json.

The solution is: you can use strftime for serialization, Such as the following method

.strftime("%Y-%m-%d %H:%M:%S")
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Let’s look at the detailed explanation of Python: time, strftime and strptime

The most commonly used time.time() What is returned is a floating point number in seconds. But the type processed by strftime is time.struct_time, which is actually a tuple. Both strptime and localtime will return this type.

>>> import time
>>> t = time.time()
>>> t
1202872416.4920001
>>> type(t)
<type &#39;float&#39;>
>>> t = time.localtime()
>>> t
(2008, 2, 13, 10, 56, 44, 2, 44, 0)
>>> type(t)
<type &#39;time.struct_time&#39;>
>>> time.strftime(&#39;%Y-%m-%d&#39;, t)
&#39;2008-02-13&#39;
>>> time.strptime(&#39;2008-02-14&#39;, &#39;%Y-%m-%d&#39;)
(2008, 2, 14, 0, 0, 0, 3, 45, -1)
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