How to get Sundays of last 90 days (3 months) from current date using datetime in Python

Question

I am trying to get a date of last 90 days Sundays (3 months Sunday) from the current date in python using datetime. I am able to get last 3 months Sunday but not from current da

Answer 1

from datetime import date, timedelta
from pprint import pprint

def is_sunday(day):
    return day.weekday() == 6

def sundays_within_last_x_days(num_days = 90):
    result = []
    end_date = date.today()
    start_date = end_date - timedelta(days = num_days)

    while start_date <= end_date:
        if is_sunday(start_date):
            result.append(start_date)
        start_date += timedelta(days = 1)

    return result

if __name__ == "__main__":
    dates = sundays_within_last_x_days(30)
    pprint(dates)

Resources

• Python DateTime, TimeDelta, Strftime(Format) with Examples
• datetime - Basic date and time types
• pprint - Data pretty printer

Answer 2

This might give you a better approach based on your draft. For more information on how to understand more about this. Please follow the next link

from datetime import date, timedelta

def all_sundays(year):
# January 1st of the given year
    dt = date(year, 1, 1)
# First Sunday of the given year       
    dt += timedelta(days = 6 - dt.weekday())  
    while dt.year == year:
        yield dt
        dt += timedelta(days = 7)

for s in all_sundays(2020):
print(s)

Output

2020-01-05
2020-01-12
2020-01-19
2020-01-26
2020-02-02

2020-12-06
2020-12-13
2020-12-20
2020-12-27