[PYTHON/COMMON] 특정일이 속하는 주(Week)의 첫번째 날짜(월요일) 구하기

■ 특정일이 속하는 주(Week)의 첫번째 날짜(월요일)를 구하는 방법을 보여준다.

▶ 예제 코드 (PY)


import datetime

def AddDays(sourceDate, count):
    targetDate = sourceDate + datetime.timedelta(days = count)
    return targetDate

def GetWeekFirstDate(sourceDate):
    temporaryDate = datetime.datetime(sourceDate.year, sourceDate.month, sourceDate.day)
    weekDayCount  = temporaryDate.weekday()
    targetDate    = AddDays(temporaryDate, -weekDayCount);
    return targetDate

if __name__ == "__main__":
    print(GetWeekFirstDate(datetime.datetime(2016, 2 , 21))) # 2016-02-15 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2016, 2 , 22))) # 2016-02-22 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2016, 2 , 23))) # 2016-02-22 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2016, 2 , 24))) # 2016-02-22 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2016, 2 , 25))) # 2016-02-22 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2016, 2 , 26))) # 2016-02-22 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2016, 2 , 27))) # 2016-02-22 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2016, 2 , 28))) # 2016-02-22 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2016, 2 , 29))) # 2016-02-29 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2016, 3 , 1 ))) # 2016-02-29 00:00:00

    print(GetWeekFirstDate(datetime.datetime(2019, 11, 9 ))) # 2019-11-04 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2019, 11, 10))) # 2019-11-04 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2019, 11, 11))) # 2019-11-11 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2019, 11, 12))) # 2019-11-11 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2019, 11, 13))) # 2019-11-11 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2019, 11, 14))) # 2019-11-11 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2019, 11, 15))) # 2019-11-11 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2019, 11, 16))) # 2019-11-11 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2019, 11, 17))) # 2019-11-11 00:00:00
    print(GetWeekFirstDate(datetime.datetime(2019, 11, 18))) # 2019-11-18 00:00:00

import datetime

def AddDays(sourceDate, count):

targetDate = sourceDate + datetime.timedelta(days = count)

return targetDate

def GetWeekFirstDate(sourceDate):

temporaryDate = datetime.datetime(sourceDate.year, sourceDate.month, sourceDate.day)

weekDayCount = temporaryDate.weekday()

targetDate = AddDays(temporaryDate, -weekDayCount);

return targetDate

if __name__ == "__main__":

print(GetWeekFirstDate(datetime.datetime(2016, 2 , 21))) # 2016-02-15 00:00:00

print(GetWeekFirstDate(datetime.datetime(2016, 2 , 22))) # 2016-02-22 00:00:00

print(GetWeekFirstDate(datetime.datetime(2016, 2 , 23))) # 2016-02-22 00:00:00

print(GetWeekFirstDate(datetime.datetime(2016, 2 , 24))) # 2016-02-22 00:00:00

print(GetWeekFirstDate(datetime.datetime(2016, 2 , 25))) # 2016-02-22 00:00:00

print(GetWeekFirstDate(datetime.datetime(2016, 2 , 26))) # 2016-02-22 00:00:00

print(GetWeekFirstDate(datetime.datetime(2016, 2 , 27))) # 2016-02-22 00:00:00

print(GetWeekFirstDate(datetime.datetime(2016, 2 , 28))) # 2016-02-22 00:00:00

print(GetWeekFirstDate(datetime.datetime(2016, 2 , 29))) # 2016-02-29 00:00:00

print(GetWeekFirstDate(datetime.datetime(2016, 3 , 1 ))) # 2016-02-29 00:00:00

print(GetWeekFirstDate(datetime.datetime(2019, 11, 9 ))) # 2019-11-04 00:00:00

print(GetWeekFirstDate(datetime.datetime(2019, 11, 10))) # 2019-11-04 00:00:00

print(GetWeekFirstDate(datetime.datetime(2019, 11, 11))) # 2019-11-11 00:00:00

print(GetWeekFirstDate(datetime.datetime(2019, 11, 12))) # 2019-11-11 00:00:00

print(GetWeekFirstDate(datetime.datetime(2019, 11, 13))) # 2019-11-11 00:00:00

print(GetWeekFirstDate(datetime.datetime(2019, 11, 14))) # 2019-11-11 00:00:00

print(GetWeekFirstDate(datetime.datetime(2019, 11, 15))) # 2019-11-11 00:00:00

print(GetWeekFirstDate(datetime.datetime(2019, 11, 16))) # 2019-11-11 00:00:00

print(GetWeekFirstDate(datetime.datetime(2019, 11, 17))) # 2019-11-11 00:00:00

print(GetWeekFirstDate(datetime.datetime(2019, 11, 18))) # 2019-11-18 00:00:00