Python日期转换

Python日期转换

某年第几天转化为年月日

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将某年中的第N天转换为“年-月-日”

import datetime
def out_date(year,day):fir_day = datetime.datetime(year,1,1)zone = datetime.timedelta(days=day-1)return datetime.datetime.strftime(fir_day + zone, "%Y-%m-%d")

将日期（年、月、日）转换为某年中的第N天

import datetime
def which_day(year, month, date):end = datetime.date(year, month, date)start = datetime.date(year, 1, 1)return (end - start).days + 1

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