find average days between a list of dates

avg_days_between.py

from datetime import date, timedelta

# dates to average (for example, mushoku tensei v01-24 digital release dates)
dates = [
    (2019, 4, 4),
    (2019, 5, 23),
    (2019, 8, 1),
    (2019, 10, 10),
    (2020, 1, 16),
    (2020, 4, 2),
    (2020, 7, 9),
    (2020, 10, 1),
    (2021, 1, 21),
    (2021, 3, 25),
    (2021, 5, 6),
    (2021, 7, 15),
    (2021, 9, 23),
    (2021, 11, 25),
    (2022, 2, 17),
    (2022, 4, 21),
    (2022, 6, 16),
    (2022, 7, 14),
    (2022, 9, 29),
    (2022, 12, 22),
    (2023, 2, 23),
    (2023, 5, 4),
    (2023, 7, 6),
    (2023, 8, 24),
]

# time delta between each date
deltas = [
    (date(*dates[i + 1]) - date(*d)) for i, d in enumerate(dates) if i + 1 < len(dates)
]

# simple days between
days_between = [delta.days for delta in deltas]

# rounded avg days between
avg_days_between = round(sum(days_between) / len(days_between))

# estimate next date: last date + avg gap
next_date_estimate = date(*dates[-1]) + timedelta(days=avg_days_between)

# output full list of days between
# print(days_between)

print(f"shortest gap: {min(days_between)} days")
print(f"longest gap: {max(days_between)} days")
print(f"average gap: {avg_days_between} days")

# output estimated next date
# print(f"next date estimate: {next_date_estimate}")