Date

Links

Note

Check dateutil. It is very nice.

time
Calendar
https://github.com/crsmithdev/arrow Better date and time manipulation for Python
datetime - Basic date and time types
http://effbot.org/librarybook/datetime.htm
http://labix.org/python-dateutil The dateutil module provides powerful extensions to the standard datetime module.

Snippets

Note

Check dateutil before using these snippets…

Add one day, Date
Add one month, Date
Last day of month, Date
Remove the time, Date

Constructor

datetime(year, month, day [,hour [,minute [,second]]])

Combine

Combine date and time:

start_date_time = datetime.combine(start_date, start_time)

Conversion

String

>>> from datetime import datetime
>>> datetime.strptime("2007-03-04 21:08:12", "%Y-%m-%d %H:%M:%S")
datetime.datetime(2007, 3, 4, 21, 8, 12)
>>>
>>> datetime.strptime('26/04/2009 20:39:34', '%d/%m/%Y %H:%M:%S')
datetime.datetime(2009, 4, 26, 20, 39, 34)

Time Stamp

print datetime.datetime.fromtimestamp(value)

Difference

timedelta

“Only days, seconds and microseconds are stored internally”. To calculate the difference, you only have to take into account these three values:

>>> import datetime
>>> d1 = datetime.datetime(2007, 11, 1, 19, 30)
>>> d2 = datetime.datetime(2007, 11, 1, 19, 45)
>>> t = d2 - d1
>>> t
datetime.timedelta(0, 900)
>>> t.days, t.seconds, t.microseconds
(0, 900, 0)

To convert a timedelta into milliseconds and minutes:

def timedelta_minutes(td):
    return td.days * 1440 + td.seconds / 60

def timedelta_seconds(td):
    return td.total_seconds()

def timedelta_milliseconds(td):
    return td.days * 86400000 + td.seconds * 1000 + td.microseconds / 1000

Iterator

Using this nice date range iterator:

import datetime

def datetime_iterator(from_date=datetime.datetime.now(), to_date=None):
    while to_date is None or from_date <= to_date:
        yield from_date
        from_date = from_date + datetime.timedelta(days=1)
    return

…we can get a list of dates:

date_start = datetime.datetime(2009, 7, 27)
date_end = datetime.datetime(2009, 11, 16)
for report_date in datetime_iterator(date_start, date_end):
    print report_date

Replace

date.replace(year, month, day)

Return a date with the same value, except for those parameters given new values by whichever keyword arguments are specified. For example, if:

d == date(2002, 12, 31)``, then ``d.replace(day=26) == date(2002, 12, 26)

Today

from datetime import datetime
datetime.today()

Format

>>> from datetime import datetime
>>> now = datetime.now()

>>> now.strftime("%Y%m%dT%H%M%S")
'20080423T144805'

>>> now.strftime("%a %d %b %Y %H:%M:%S")
'Wed 23 Apr 2008 14:48:05'

>>> now.strftime('%d/%m/%Y %H:%M')
'20/05/2011 10:55'

Also see strftime in time and http://strftime.org/