Python实现周日历与时间相互转换

from datetime import datetime
# 时间转周日历
a = datetime.now().strftime("%Y,%W,%w")
print(a) # 2022,28,3
# 周日历转时间
a = datetime.strptime("2022,12,3","%Y,%W,%w")
print(a) # 2022-03-23 00:00:00

from datetime import datetime
a = datetime.strptime("2021-12-31", "%Y-%m-%d")
print(a.strftime("%Y,%W,%w"))# 2021,52,5
a = datetime.strptime("2022-01-01", "%Y-%m-%d")
print(a.strftime("%Y,%W,%w"))# 2022,00,6

from datetime import datetime

def str_to_time(time_str: str) -> datetime:
 return datetime.strptime(time_str, "%Y-%m-%d")

time_list = [
 "2021-12-30",
 "2021-12-31",
 "2022-01-01",
 "2022-01-02",
 "2022-01-03",
]
for i in time_list:
 t = str_to_time(i)
 iso = t.isocalendar()
 print(i, " > ", f"{iso.year},{iso.week},{iso.weekday}")
# 2021-12-30  >  2021,52,4
# 2021-12-31  >  2021,52,5
# 2022-01-01  >  2021,52,6
# 2022-01-02  >  2021,52,7
# 2022-01-03  >  2022,1,1

from datetime import datetime
time_list = (
 (2021, 52, 4),
 (2021, 52, 5),
 (2021, 52, 6),
 (2021, 52, 7),
 (2022, 1, 1),
)
for year, week, weekday in time_list:
 t = datetime.fromisocalendar(year, week, weekday)
 print(f"{year},{week},{weekday}", " > ", t)
# 2021,52,4  >  2021-12-30 00:00:00
# 2021,52,5  >  2021-12-31 00:00:00
# 2021,52,6  >  2022-01-01 00:00:00
# 2021,52,7  >  2022-01-02 00:00:00
# 2022,1,1  >  2022-01-03 00:00:00

from datetime import datetime

def datetime_to_isoweek(datetime_: datetime) -> tuple[int, int, int]:
 """时间转换为iso周日历
 Args:
  datetime_ (datetime): 时间
 Returns:
  tuple[int,int,int]: year,week,weekday
 """
 iso = datetime_.isocalendar()
 return iso.year, iso.week, iso.weekday

def isoweek_to_datetime(isoweek: tuple[int, int, int]) -> datetime:
 """iso周日历转换为时间
 Args:
  isoweek (tuple[int,int,int]): year,week,weekday
 Returns:
  datetime: 时间
 """
 year, week, weekday = isoweek
 return datetime.fromisocalendar(year, week, weekday)