1. Python – Dates and Times

2. Working with time in Python
The module for handling time is called "datetime" it contains four classes:
date - year, month, and day
time - hour, minute, second, microsecond, and timezone
datetime - holds both date and time (see above)
timedelta - holds a 'difference' in time between two of the above
Details here:

3. datetime.date Two ways to construct:
date(year, month, day)
date.today()
You can get the data out through attributes:
date.year, date.month, date.day
d = datetime.date(2000, 12, 15)
d.year # 2000

4. datetime.time One constructor:
time(hour, minute, second, microsecond) all are assumed 0 unless specified
You can get the data out through attributes:
time.hour, time.minute, time.second, time.microsecond
t = datetime.time(14, 11, 56)
t.minute # 11

5. datetime.datetime Two constructors:
datetime(year, month, day, hour, minute, second, microsecond)
datetime.now() gets the current date and time
You can get the data out through attributes:
Combined attributes of date and time
dt = datetime.datetime.now()
dt.day # 8
dt.hour # 1

6. datetime.timedelta One constructor:
timedelta(days, hours, minutes, seconds, ...)
Defaults to zero if arguments aren't supplied
delta = datetime.timedelta(days=2) # Represents 2 days duration
You can use it to calculate datetimes:
datetime.datetime.now() + delta # yields a date 2 days from now

7. import datetime now = datetime. datetime. now() birth = datetime
import datetime now = datetime.datetime.now() birth = datetime.datetime(1988, 11, 1, 9) #Nov 1st, AM my_age = now - birth # age is a timedelta legal_drinking_age = datetime.timedelta(days = (21 * 365)) is_legal_to_drink = my_age > legal_drinking_age # Doesn't take leap days/seconds into account

8. Converting Python datetime to ISO 8601
All the datetime classes have a "strftime" method
This method will output a string formatted according to a pattern
dt = datetime.datetime(2015, 3, 4, 12, 35)
dt.strftime("%Y-%m-%d %H:%M:%S")
# yields ' :35:00'
You can use the datetime class method, "strptime", to convert a string to a datetime object.
The method takes a date_string and a format, and it returns a datatime object
dt2 = datetime.datetime.strptime(' :35:00',
"%Y-%m-%d %H:%M:%S")
assert dt == dt2

9. Combining Python and SQLite datetimes
SQL databases can't hold Python objects, so you must convert them to ISO 8601 and store the resulting TEXT.
You can use the 'strftime' method to do this
On retrieving a date encoded as TEXT you can convert the string back to a Python datetime class.
You can use the 'strptime' method to do this
Note, using SQL date/time functions may alter the format (i.e. add microsecond precision or timezone info) so you should refrain from using them.