This notebook was prepared by Donne Martin. Source and license info is on GitHub.

Dates and Times

Basics
strftime
strptime
timedelta

Basics

python

from datetime import datetime, date, time

python

year = 2015
month = 1
day = 20
hour = 7
minute = 28
second = 15

python

dt = datetime(year, month, day, hour, minute, second)

python

dt.hour, dt.minute, dt.second

Extract the equivalent date object:

python

dt.date()

Extract the equivalent time object:

python

dt.time()

When aggregating or grouping time series data, it is sometimes useful to replace fields of a series of datetimes such as zeroing out the minute and second fields:

python

dt.replace(minute=0, second=0)

strftime

Format a datetime string:

python

dt.strftime('%m/%d/%Y %H:%M')

strptime

Convert a string into a datetime object:

python

datetime.strptime('20150120', '%Y%m%d')

timedelta

Get the current datetime:

python

dt_now = datetime.now()

Subtract two datetime fields to create a timedelta:

python

delta = dt_now - dt
delta

Add a datetime and a timedelta to get a new datetime:

python

dt + delta