日付

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月末の日付を求める

基本的な考え方は、月始めから1日引き算するだけ。

# coding:UTF-8
from datetime import datetime, timedelta

def create_date_list(start_year):
    date_pairs = []
    end_year = datetime.today().year
    end_month = datetime.today().month
    end_date = datetime.today().day
    end_datetime = datetime(end_year, end_month, end_date)

    for year in range(start_year, end_year + 1, 1):
        for month in range(1, 13, 1):
            this_datetime = datetime(year, month, 1)
            if this_datetime > end_datetime:
                continue

            start_date = datetime(year, month, 1)
            # 月末日を求める
            next_month = month + 1
            if next_month > 12:
                year += 1
                next_month = 1
            middle_date = datetime(year, next_month, 1) - timedelta(days=1)
            date_pair = [
                [
                    ['start_year', str(start_date.year)],
                    ['start_month', "{:02}".format(start_date.month)],
                    ['start_day', "{:02}".format(start_date.day)],
                ],
                [
                    ['end_year', str(middle_date.year)],
                    ['end_month', "{:02}".format(middle_date.month)],
                    ['end_day', "{:02}".format(middle_date.day)],
                ]
            ]

            date_pairs.append(date_pair)
    return date_pairs




if __name__ == '__main__':
    results = create_date_list(2021)
    for result in results:
        print(result)