Python processing date methods detailed book (30 methods)

Using the time module to display the current date and time

import time
from time import gmtime, strftime
 
t = ()  
print ((t))  # Sun May 7 09:30:37 2017
print(strftime("%a, %d %b %Y %H:%M:%S +0000", gmtime()))  # Sun, 07 May 2017 04:00:37 +0000
print(strftime("%A", gmtime()))  # Sunday
print(strftime("%D", gmtime()))  # 05/07/17
print(strftime("%B", gmtime()))  # May
print(strftime("%y", gmtime()))  # 17
 
# Convert seconds into GMT date
print(strftime("%a, %d %b %Y %H:%M:%S +0000", gmtime(1234567890)))  # Fri, 13 Feb 2009 23:31:30 +0000

II. Converting days, hours and minutes to seconds

SECONDS_PER_MINUTE = 60
SECONDS_PER_HOUR = 3600
SECONDS_PER_DAY = 86400
 
# of days, hours, minutes, seconds entered
days = int(input("Enter number of Days: "))
hours = int(input("Enter number of Hours: "))
minutes = int(input("Enter number of Minutes: "))
seconds = int(input("Enter number of Seconds: "))
 
# Calculated
total_seconds = days * SECONDS_PER_DAY
total_seconds = total_seconds + ( hours * SECONDS_PER_HOUR)
total_seconds = total_seconds + ( minutes * SECONDS_PER_MINUTE)
total_seconds = total_seconds + seconds
 
# Results
print("Total number of seconds: ","%d"%(total_seconds))
'''
Enter number of Days: 5
Enter number of Hours: 36
Enter number of Minutes: 24
Enter number of Seconds: 15
Total number of seconds: 563055
'''

Using Pandas to Get the Current Date and Time

import pandas as pd
print(())  # 2018-01-19 16:08:28.393553
print(().date())  # 2018-01-19
print(().year)  # 2018
print(().month)  # 1
print(().day)  # 19
print(().hour)  # 16
print(().minute)  # 8
print(().second)  # 28
print(().microsecond)  # 394553

Fourth, the string will be converted to date and time objects

from datetime import datetime
from dateutil import parser

d1 = "Jan 7 2015  1:15PM"
d2 = "2015 Jan 7  1:33PM"

# If you know date format
date1 = (d1, '%b %d %Y %I:%M%p')
print(type(date1))  # class ''
print(date1)  # 2015-01-07 13:15:00

# If you don't know date format
date2 = (d2)
print(type(date2))  # class ''
print(date2)  # 2015-01-07 13:33:00

V. Getting the current time in milliseconds

import time
 
milliseconds = int(round(() * 1000))
print(milliseconds)  # 1516364270650

Get the current date and time in MST, EST, UTC, GMT and HST.

from datetime import datetime
from pytz import timezone
 
mst = timezone('MST')
print("Time in MST:", (mst))  # Time in MST: 2017-01-19 06:06:14.495605-07:00
est = timezone('EST')
print("Time in EST:", (est))  # Time in EST: 2017-01-19 08:06:14.496606-05:00
utc = timezone('UTC')
print("Time in UTC:", (utc))  # Time in UTC: 2017-01-19 13:06:14.496606+00:00
gmt = timezone('GMT')
print("Time in GMT:", (gmt))  # Time in GMT: 2017-01-19 13:06:14.496606+00:00
hst = timezone('HST')
print("Time in HST:", (hst))  # Time in HST: 2017-01-19 03:06:14.497606-10:00

VII. Getting the day of the week from a given date

import datetime
 
dayofweek = (2010, 6, 16).strftime("%A")
print(dayofweek)  # Wednesday

# weekday() method: 0 for Monday, 6 for Sunday
print("weekday():", (2010, 6, 16).weekday())  # weekday(): 2
 
# isoweekday() method: 1 for Monday, 7 for Sunday
print("isoweekday()", (2010, 6, 16).isoweekday())  # isoweekday() 3
 
dayofweek = ().strftime("%A")
print(dayofweek)  # Friday
print("weekday():", ().weekday())  # weekday(): 4
print("isoweekday()", ().isoweekday())  # isoweekday(): 5

VIII. Calculating the time difference between two date-time objects

import datetime
from datetime import timedelta
 
datetimeFormat = '%Y-%m-%d %H:%M:%S.%f'
date1 = '2016-04-16 10:01:28.585'
date2 = '2016-03-10 09:56:28.067'
diff = (date1, datetimeFormat)\
    - (date2, datetimeFormat)
 
print("Difference:", diff)  # Difference: 37 days, 0:05:00.518000
print("Days:", )  # Days: 37
print("Microseconds:", )  # Microseconds: 518000
print("Seconds:", )  # Seconds: 300

IX. Adding 5 minutes to a Unix timestamp

import datetime
import calendar
 
future = () + (minutes=5)
print((()))  # 1621069619

X. Iterating through a series of dates

import datetime

start = ("21-06-2020", "%d-%m-%Y")
end = ("05-07-2020", "%d-%m-%Y")
date_generated = [start + (days=x) for x in range(0, (end - start).days)]

for date in date_generated:
    print(("%d-%m-%Y"))

XI. Change of time from Paris to New York

import pendulum
 
in_paris = (2016, 8, 7, 22, 24, 30, tz='Europe/Paris')
print(in_paris)  # 2016-08-07T22:24:30+02:00
 
in_us = in_paris.in_timezone('America/New_York')
print(in_us)  # 2016-08-07T16:24:30-04:00

XII. Using Python to get the last 7 working days

from datetime import date
from datetime import timedelta
 
today = ()
 
for i in range(7):
    d = today - timedelta(days=i)
    if () < 5:
        print(d)

XIII. Age deduction from today's date and a person's birthday

from datetime import date
 
def calculate_age(born):
    today = ()
    try:
        birthday = (year=)
    except ValueError:
        birthday = (year=, month= + 1, day=1)
    if birthday > today:
        return  -  - 1
    else:
        return  - 
 
print(calculate_age(date(2001, 3, 1)))

XIV. Getting the first Tuesday of the month

import calendar
from datetime import datetime
 
c = (firstweekday=)
monthcal = (().year, ().month)
#Python white learning exchange group: 153708845
try:
    tues = [day for week in monthcal for day in week if
            () ==  and  == ().month][0]
    print(tues)
except IndexError:
    print('No date found')

XV. Convert integers to date objects

from datetime import datetime

i = 1545730073
timestamp = (i)

print(timestamp)  # 2018-12-25 14:57:53
print(type(timestamp))

XVI. Current date minus N number of days

from datetime import datetime, timedelta

d = () - timedelta(days=5)
print(d)

XVII. Comparing two dates

import datetime

a = (2020, 12, 31, 23, 59, 59)
b = (2020, 11, 30, 23, 59, 59)

print(a < b)
print(a > b)

Extracting years from datetime objects

import datetime
 
year = ().year
print(year)

XIX. Finding the day of the week according to the date

import pendulum
 
dt = ('2021-05-18')
print(dt.day_of_week)  # 2
 
dt = ('2021-05-01')
print(dt.day_of_week) # 6
 
dt = ('2021-05-21')
print(dt.day_of_week) # 5

XX. Getting the date 7 days ago from the current date

from datetime import datetime, timedelta
 
now = ()
 
for x in range(7):
    d = now - timedelta(days=x)
    print(("%Y-%m-%d"))

XXI. Convert the difference between two date-time objects to seconds

import datetime
 
time1 = ('19 01 2021', '%d %m %Y')
time2 = ('25 01 2021', '%d %m %Y')
 
difference = time2 - time1
print(difference)  # 6 days, 0:00:00
 
seconds = difference.total_seconds()
print(seconds)  # 518400.0

XXII. Getting the Nth Friday of any month

import calendar

# Take the third Friday of May, 2021.
c = (firstweekday=)
year = 2021
month = 5
n = 2  # Take the third
monthcal = (year, month)
 
try:
    third_friday = [
        day for week in monthcal 
            for day in week if
                () ==  and  == month
    ][n]
    print(third_friday)  # 2021-05-21
except IndexError:
    print('No date found')

XXIII. Obtaining dates based on the number of weeks

import datetime
from  import relativedelta
 
week = 25
year = 2021
date = (year, 1, 1) + relativedelta(weeks=+week)
print(date)  # 2021-06-25

XXIV. Working days for obtaining specific dates

import datetime
 
print((2020, 5, 15).isocalendar()[2])  # 5

Create a DateTime that is 15 minutes old.

import datetime
#Python white learning exchange group: 153708845
dt = () - (minutes=15)
print(dt)  # 2021-05-15 22:25:55.897365

XXVI. Getting the start and end of the week from a specific date

import pendulum
 
dt = (2012, 9, 5)
 
start = dt.start_of('week')
print(start.to_datetime_string())  # 2012-09-03 00:00:00
 
end = dt.end_of('week')
print(end.to_datetime_string())  # 2012-09-09 23:59:59

XXVII. Difference between two dates (in seconds)

from datetime import datetime
#Python white learning exchange group: 153708845
fmt = '%Y-%m-%d %H:%M:%S'
d1 = ('2020-01-01 17:31:22', fmt)
d2 = ('2020-01-03 17:31:22', fmt)
 
days_diff = d2 - d1
print(days_diff.days * 24 * 60 * 60)  # 172800

XXVIII. Get yesterday's date in this format MMDDYYY

from datetime import date, timedelta
 
yesterday = () - timedelta(days=1)
print(('%m%d%y'))  # 051421

XXIX. Get last Wednesday's date based on today's date

from datetime import date
from datetime import timedelta

today = ()

offset = (() - 2) % 7
wednesday = today - timedelta(days=offset)
print(wednesday)  # 2021-05-12

XXX. Print a list of all available time zones

import pytz

for i in pytz.all_timezones:
    print(i)

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