How to calculate next Friday?

Question

How can I calculate the date of the next Friday?

Answer 1

You can calculate any next day dates using these this code below.

from datetime import datetime as dt
from datetime import timedelta

def get_weekday(day):
    days  = ["mon","tue","wed","thu","fri","sat","sun"]
    return days.index(day) + 1

def get_next_dayofweek_datetime(date_time, dayofweek):
    start_time_w = date_time.isoweekday()
    target_w = get_weekday(dayofweek)
    if start_time_w < target_w:
      day_diff = target_w - start_time_w
    else:
        day_diff = 7 - (start_time_w - target_w)

    return date_time + timedelta(days=day_diff)

def get_next_n_weekends_dates(date_time, weekday, n=2):
  days_list = []
  week_date_time = date_time
  while n > 0:
      week_date_time = get_next_dayofweek_datetime(week_date_time, weekday)
      days_list.append(week_date_time)
      n = n -1
  return  days_list

start_time = dt.strptime("2020-02-01 20:20:00", "%Y-%m-%d %H:%M:%S") # wednesday


print(get_next_dayofweek_datetime(start_time, "thu"))
print(get_next_dayofweek_datetime(start_time, "fri"))
print(get_next_dayofweek_datetime(start_time, "sat"))
print(get_next_dayofweek_datetime(start_time, "sun"))
print(get_next_dayofweek_datetime(start_time, "mon"))
print(get_next_dayofweek_datetime(start_time, "tue"))
print(get_next_dayofweek_datetime(start_time, "wed"))
print(get_next_dayofweek_datetime(start_time, "thu"))

print("get next two fridays or mote ")
print(get_next_n_weekends_dates(start_time, "fri", 2))

output:

2020-02-06 10:20:00
2020-02-07 10:20:00
2020-02-08 10:20:00
2020-02-02 10:20:00
2020-02-03 10:20:00
2020-02-04 10:20:00
2020-02-05 10:20:00
2020-02-06 10:20:00
get next two fridays or mote 
[datetime.datetime(2020, 2, 7, 10, 20), datetime.datetime(2020, 2, 14, 10, 20)]