import datetime
def reformat_subway_dates(date):
'''
The dates in our subway data are formatted in the format month-day-year.
The dates in our weather underground data are formatted year-month-day.
In order to join these two data sets together, we'll want the dates formatted
the same way. Write a function that takes as its input a date in the MTA Subway
data format, and returns a date in the weather underground format.
Hint:
There are a couple of useful functions in the datetime library that will
help on this assignment, called strptime and strftime.
More info can be seen here and further in the documentation section:
http://docs.python.org/2/library/datetime.html#datetime.datetime.strptime
'''
date_formatted = datetime.datetime.strptime(date,'%m-%d-%y').strftime('%Y-%m-%d')# your code here
return date_formatted
Python中的时间日期转换
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