Python中标准模块datetime能够将字符串转换为日期

Python代码

from datetime import datetime

text = '2012-09-20'

y = datetime.strptime(text, '%Y-%m-%d')

print(y)

z = datetime.now()

diff = z - y

print(diff)

按特定格式输出

Java代码

nice_z = datetime.strftime(z, '%A %B %d, %Y')

print(nice_z)

datetime.strftime性能很差，下面自己编写一个函数

Python代码

from datetime import datetime

def parse_ymd(s):

year_s, mon_s, day_s = s.split('-')

return datetime(int(year_s), int(mon_s), int(day_s))

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