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More than 1 year has passed since last update.

4年に1回バグが出る

Python

Posted at 2024-02-29

コード

import datetime
dt = datetime.datetime.strptime('02月29日', '%m月%d日')
month = dt.month
day = dt.day
print(dt)
print(month, day)

⇓実行

ValueError: day is out of range for month

原因

年が渡されていないので、"1900-02-29 00:00:00" とライブラリが解釈しようとして、1900年に29日はありませんよ！と怒られる。

対策

datetime.datetime.strptimeを使う際は、年も必ず入れよう！

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