Datetime is python’s standard library for handling times and dates!

1, the date class

The date class is a date class consisting of year, month, and day. Since Python is also an object-oriented programming language, there are constructors for classes. Constructors for this class are as follows:

• class datetime.date(year, month, day):

  • year: year, range [MINYEAR, MAXYEAR], i.e. [1, 9999]
  • month: indicates month, range [1, 12]
  • day: Number of days in a month. The maximum value is determined by the given year and month parameters. For example, February has 29 days in a leap year

1.1, the sample

Import datetime now_date = datetime.date(2021, 8, 8) # print(now_date) # 2021-08-08Copy the code

1.2. Return the week corresponding to the date

import datetime

print(datetime.date(2021, 8, 8).weekday())  # 6
Copy the code

2, time

Import datetime now_time = datetime.time(13, 27, 22, 3) print(now_time) # 13:27:22.000003Copy the code

3, a datetime class

3.1. Common methods:

• Datetime.now ()
• Get the current date: datetime.now().date()
• Get the current time: datetime.now().time()

3.1.1, sample

From datetime import datetime now_datetime = datetime.now() print(' datetime :', now_datetime) print(' datetime :', Now_datetime.date ()) print(' current time :', now_datetime.time())Copy the code

3.2. Date-time is converted to timestamp

datetime.now().timestamp()
Copy the code

3.2.1, sample

From datetime import datetime print(datetime.now().timestamp()) # 1628400938.312667Copy the code

3.3. Date-time is converted to timestamp

Datetime. Fromtimestamp (1628400938.312667)Copy the code

3.3.1, sample

From datetime import Datetime print(datetime.fromtimestamp(1628400938.312667)) # 2021-08-08 13:35:38.312667Copy the code

3.4. Convert date and time objects to strings

datetime.now().strftime('%Y-%m-%d')
Copy the code

3.4.1 track, sample

from datetime import datetime

print(datetime.now().strftime('%Y-%m-%d'))  # 2021-08-08
Copy the code

3.5 string to date and time object

datetime.strptime(data_str, format)
Copy the code

3.5.1 track of, sample

from datetime import datetime
print(datetime.strptime('2021-8-8 13:42:00', '%Y-%m-%d %H:%M:%S'))  # 2021-08-08 13:42:00
Copy the code

4. Interval objects

This class is used for time calculation! Note: The time object and timedelta object must be used to calculate, otherwise an error is reported.

4.1 the sample

import datetime

now = datetime.datetime.now()
a = datetime.timedelta(hours=10, minutes=12, seconds=22)
print(now - a)
print(now + a)
Copy the code

5. Obtain the days of the specified month

There is no method of how many days there are in a month in Python’s DateTime module, but you can get it using the Calendar module.

import calendar

monthRange = calendar.monthrange(2021, 8)
print(monthRange)  # (6, 31)
Copy the code

MonthRange can return two integers:

• The first integer indicates the number of the week starting in the month (0: Monday… 6: Sunday).
• Second integer: the number of days representing the last day of the month.