Using Python module in datetime

datetime Profile

      datetime advanced than a lot of time, can be understood based on time to encapsulate the datetime, provides functions you use, the interface module datetime more intuitive and easier to call

datetime module class

The class name	use
datetime	While there is time and date
hour delta	Time span for calculating the main
tzinfo	The time zone
time	Focus only on time
date	Only concerned Date

datetime class function

1, datetime.now () function

      DateTime.Now () function is used to obtain the current time

      datetime.now () function usage:

            datetime.datetime.now()

      Datetime is datetime first module, the second module in a datetime datetime datetime class

      type of typedatetime.datetime

import datetime

d1 = datetime.datetime.now()
print(d1)

      Operating results as follows:

2020-01-27 19:22:32.745600

      NOTE: The next .745600 milliseconds, it is negligible

2, datetime () function

      datetime () function is used to obtain a specified time

      datetime () function usage:

            datetime.datetime(x)

      Parameters x - - own seven parameters specified tuple type of time period

      type of typedatetime.datetime

import datetime

d1 = datetime.datetime(1999, 10, 5, 12, 30, 54, 123456)
print(d1)

      Operating results as follows:

1999-10-05 12:30:54.123456

3, strftime () function

      strftime () function is used to time into a string

      strftime () function usage:

            datetime.datetime.now().strftime(x)

      Parameters x - - your specified format symbol

      datetime.datetime.now () refers to the current time

      type of typestr

import datetime

d1 = datetime.datetime.now()
print(d1)
d2 = d1.strftime("%X")
print(d2)

      Operating results as follows:

2020-01-28 17:08:34.932033
17:08:34

4, strptime () function

      the strptime () function is used to format string into datetime objects

      strptime () function usage:

            datetime.datetime.strptime(p，x)

      Parameter P - - conversion time required string
      parameter x - - their specified formatting symbols

      Note: The format conversion to be consistent with the string

      type of typedatetime.datetime

import datetime

d1 = datetime.datetime.now()
print(d1)
d2 = d1.strftime("%X")
print(d2)
d3 = datetime.datetime.strptime(d2, "%X")
print(d3)

      Operating results as follows:

2020-01-28 17:15:29.958495
17:15:29
1900-01-01 17:15:29

      We note that here I did not start the conversion date, only transformed hours minutes seconds, so after the completion of the conversion Python did not know of the month, so for the initial 1900-01-01

5, the number of days interval

      Days two time intervals directly subtracted to get the results

import datetime

d1 = datetime.datetime.now()
d2 = datetime.datetime(2000, 10, 25, 12, 45, 45, 123456)
d3 = d1 - d2
print(d3)
print(d3.days)
print(type(d3))

      Operating results as follows:

7034 days, 4:38:06.433209
7034
<class 'datetime.timedelta'>

6, except for the number of days the number of seconds

      I do not know how to introduce directly on the code

import datetime

d1 = datetime.datetime.now()
d2 = datetime.datetime(2000, 10, 25, 12, 45, 45, 123456)
d3 = d1 - d2
print(d3)
print(d3.seconds)
print(type(d3))

      Operating results as follows:

7034 days, 4:40:41.623565
16841
<class 'datetime.timedelta'>