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[Python]UNIX秒(UTC)をISO8601(JST)に変換する

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用途

データとしてはUTCのエポック秒を持ちつつビューには日本時間の見やすい表記にしたい場合

やること

datetime のオブジェクトでタイムゾーンを操作して最終的に文字列や数値として書き出す

UNIX(UTC) to ISO8601(JST)

from datetime import datetime, timezone, timedelta


JST = timezone(timedelta(hours=+9), 'JST')

# [サンプル]UNIX秒(UTC)を生成
epoch = int(datetime.now(timezone.utc).strftime('%s%f')) // 1000000

# datetime(JST)に変換
dt = datetime.fromtimestamp(epoch).replace(tzinfo=timezone.utc).astimezone(tz=JST)

# ISO8601表記
print(dt.isoformat()) 

# あるいは任意のフォーマット
print(dt.strftime('%Y-%m-%d %H:%M:%S'))

ISO8601(JST) to UNIX(UTC)

from datetime import datetime, timezone, timedelta


JST = timezone(timedelta(hours=+9), 'JST')

# [サンプル]時刻を表す文字列(JST)を生成
now = datetime.now(JST).strftime('%Y-%m-%d %H:%M:%S')

# datetime(UTC)に変換
dt = datetime.strptime(now, '%Y-%m-%d %H:%M:%S').astimezone(tz=JST).replace(tzinfo=JST).astimezone(tz=timezone.utc)

# UNIX時間(UTC)
print(int(dt.strftime('%s%f')) // 1000000)
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