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【Python】月の初日や最終日を取得する方法

Python

Last updated at 2020-05-27Posted at 2020-05-27

結論

replaceメソッドを使うと楽チン。

from datetime import datetime
from dateutil.relativedelta import relativedelta

today = datetime.now().date()
print(today)
# => 2020-05-27

last_month_start = (today - relativedelta(months=1)).replace(day=1)
print(last_month_start)
# => 2020-04-01

last_month_end = today.replace(day=1) - relativedelta(days=1)
print(last_month_end)
# => 2020-04-30

変数名がアレなのは見逃してください。

参考

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