Python datetime 모듈 (현재 날짜, 시간, 요일 구하기)

Python datetime 모듈

Available Types

https://docs.python.org/3.6/library/datetime.html

datetime 사용

현재 날짜 가져오기

• datetime. 을 생략하고 싶으면 from datetime import datetime 으로

	import datetime
	datetime.datetime.today()
	datetime.datetime.now()
	print(datetime.datetime.now()) # 2020-01-07 15:40:15.087337
	now = datetime.datetime.now()
	print(now) # 2020-01-07 15:40:15.087337

년, 월, 일, 시, 분, 초

	import datetime
	now = datetime.datetime.now()
	print(now.year) # 2020
	print(now.month) # 1
	print(now.day) # 7
	print(now.hour) # 15
	print(now.minute) # 40
	print(now.second) # 15
	print(now.microsecond) # 087337

 

날짜, 시간 연산 : datetime.timedelta(시간 단위=숫자)

• # 시간 단위는 weeks, days, hours, minutes, seconds, milliseconds, microseconds 사용 가능

	import datetime
	now = datetime.datetime.now()
	print(now + datetime.timedelta(weeks=1)) # 2020-01-14 15:40:15.087337
	print(now + datetime.timedelta(days=1)) # 2020-01-08 15:40:15.087337
	print(now + datetime.timedelta(hours=5, minutes=10)) # 2020-01-07 20:50:15.087337

 

지난달 구하기

	import datetime
	from dateutil.relativedelta import relativedelta
	now = datetime.datetime.now()
	last_month = now - relativedelta(months=1)
	last_month = last_month.strftime('%Y/%m')

 

시간을 문자열로 (원하는 포맷으로) : strftime()

	import datetime
	now = datetime.datetime.now()
	print(now.strftime('%Y-%m-%d')) # 2020-01-07
	print(now.strftime('%H:%M:%S')) # 15:40:15
	print(now.strftime('%Y-%m-%d %H:%M:%S')) # 2020-01-07 15:40:15

 

시간 포맷의 문자열을 시간 형식으로 : strptime()

	import datetime
	now = datetime.datetime.now()
	print(datetime.datetime.strptime('2020-01-07 15:40:15', '%Y-%m-%d %H:%M:%S'))
	# 2020-01-07 15:40:15
	print(type(datetime.datetime.strptime('2020-01-07 15:40:15', '%Y-%m-%d %H:%M:%S')))
	# <class 'datetime.datetime'>

 

요일 구하기

	import datetime
	def what_day_is_today(self):
	now = datetime.datetime.now()
	t = ['월', '화', '수', '목', '금', '토', '일']
	r = datetime.datetime.today().weekday()
	day = str(now.year) + '년 ' + str(now.month) + '월 ' + str(now.day) + '일 ' + t[r] + '요일'
	return day