Method Name:
isocalendar
Method Signature:
isocalendar()
Overview:
isocalendar() method of datetime class returns a tuple with the following elements
- ISO Year
- ISO Week Number
- ISO Weekday
- As per ISO standard 8601 and ISO standard 2015, an ISO week has Thursday as the middle of the week. This means a new ISO year can start as early as 29th January or as late as 4th January of a regular calendar i.e, a Gregorian calendar.
- Since, an ISO year perfectly starts on a Monday - ISO years have either complete 52 weeks duration or 53 weeks duration.
- There are no fractional weeks for an ISO year.
- The sample program below, prints New Year dates for two years starting from 2020 in Gregorian Calendar as well as in ISO Calendar.
Example:
|
import datetime
# 2020 new year dateTimeInstance = datetime.datetime(2020, 1, 1, 0, 0, 0) print("Regular Date:{}".format(dateTimeInstance)) print("ISO Date:{}".format(dateTimeInstance.isocalendar()))
# 2021 new year dateTimeInstance = dateTimeInstance.replace(year=2021) print("Regular Date:{}".format(dateTimeInstance)) print("ISO Date:{}".format(dateTimeInstance.isocalendar())) |
Output:
|
Regular Date:2020-01-01 00:00:00 ISO Date:(2020, 1, 3) Regular Date:2021-01-01 00:00:00 ISO Date:(2020, 53, 5) |