python datetime module in detail

python datetime module

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Python often used for time modules are time, datetime and calendar, as the name implies, time is to represent time (hours, minutes, seconds, milliseconds), etc., calendar is to represent the calendar time, this chapter discusses the datetime module first.

Let's see what the datetime module has to offer

What's in the datetime module

What's in the datetime module
serial number		descriptive	typology
1	MAXYEAR	9999 for the maximum number of years that can be supported	int
2	MINYEAR	1, referring to the smallest year that can be supported	int
3	date	Classes representing dates, commonly used attributes are year, month, day	type
4	datetime	Classes representing date and time, commonly used attributes are hour, minute, second, microsecond	type
5	datetime_CAPI	Described in detail later	'PyCapsule' class
6	sys	Various system information	'module' class
7	time	Classes that represent time	type
8	timedelta	Indicates a time interval, i.e., the interval between two points in time. Do days, hours, minutes, seconds, milliseconds, subtle time calculations on dates	type
9	timezone	Classes representing time zones	type
10	tzinfo	Information about time zones	type

To be precise, the common classes in the datetime module are date, datetime, time, timedelta, timezone, tzinfo.

Three of the classes, date, datetime, and time, have very similar properties and methods.

A demonstration of the creation of the three classes is shown below:

import datetime
date_sample=(2021,07,20) # Year, month, day
time_sample=(12,20,33) #Hours, minutes, seconds
datetime_sample=(2021,7,20,12,20,33)#day of the month, year, hour, minute and second

The python datetime module is highlighted below, as shown below:

briefcase

from datetime import datetime

1. Obtaining the current time

now = ()
print(now)
print(type(now))
print()
print()
print()
print()
print()
print()
print()

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2. Time interval timedelta

from datetime import timedelta

Two datetime objects are subtracted to get a timedelta object

# Calculate the time interval
delta1 = datetime(2022, 6, 30, 20) - datetime(2022, 2, 2, 1)
print(delta1)
print(type(delta1))

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As shown, it represents 148 days and 19 hours.

print(datetime(2022, 6, 10) + delta1)

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timedelta passes in a different number of parameters, the meanings indicated are summarized below.

The first indicates days, the second seconds, and the third microseconds. The fourth represents milliseconds, the fifth represents minutes, and the sixth represents hours.

print(timedelta(10))
print(timedelta(10,11))
print(timedelta(10, 11, 12))
print(timedelta(10, 11, 12, 13))
print(timedelta(10, 11, 12, 13, 14))
print(timedelta(10, 11, 12, 13, 14, 15))

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3. datetime to string strftime()

stamp = datetime(2022, 6, 22)
# Force conversion of strings
print(str(stamp))
# Formatting Converting strings
print(("%Y/%m/%d %H:%M:%S"))
print(("%Y-%m-%d %H:%M:%S"))
print(("%Y/%m/%d"))
print(("%Y-%m-%d"))

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4. string to datetime object ()

dates = ['1/6/2022', '6/1/2022']
datelist = [(i, "%m/%d/%Y") for i in dates]
print(datelist)

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5. parse() parse string date

Parses a date in string form into a datetime object.
Strings can be written in many ways, as shown in the following example.

from  import parse
print(parse('1/6/2022'))
print(parse('2022-6-2'))
print(parse('2022.6.3'))
print(parse('2022 6 4'))
print(parse('2022, 6, 5'))

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