Python Summary of Time operations

1. Get the current system time

Datenow = Datetime.datetime.now ()

2. Convert time in datetime format to STR

Datenow = Datenow.strftime ("%y-%m-%d")

or Datenow = Datetime.datetime.strftime (Datenow, "%y-%m-%d")

3. Convert the time in str format to a DateTime format

Datenow = Datetime.datetime.strptime (Datenow, "%y-%m-%d")

4. A time in a DateTime format known as a forward fetch of a historical date

Import Calendar

① year

For I in Range (1,n):

His_year = Datenow.year-i

His_mon = Datenow.month

his_day = min (Datenow.day, Calendar.monthrange (His_year,his_mon) [1]) #天 cannot exceed the maximum number of days in the month

His_date = Datetime.datetime (His_year, His_mon, His_day)

② Month

For I in Range (1,n):

month = datenow.month-1-I.

His_year = Datenow.year + MONTH/12

His_mon = month%12 + 1

his_day = min (Datenow.day, Calendar.monthrange (His_year,his_mon) [1])

His_date = Datetime.datetime (His_year, His_mon, His_day)

③ days

For I in Range (1,n):

His_date = Datenow-datetime.timedelta (days=i)

Python Summary of Time operations