datetime模块为日期和时间处理同时提供了简单和复杂的方法。
支持日期和时间算法的同时，实现的重点放在更有效的处理和格式化输出。
该模块还支持时区处理:
dates are easily constructed and formatted
from datetime import date
now = date.today()
now
datetime.date(2003, 12, 2)now.strftime("%m-%d-%y. %d %b %Y is a %A on the %d day of %B.")
‘12-02-03. 02 Dec 2003 is a Tuesday on the 02 day of December.’
dates support calendar arithmetic
birthday = date(1964, 7, 31)
age = now - birthday
age.days
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