Explain the DATE Function ' ISOYEAR' in Tableau with Example?

In Tableau, the ISOYEAR function is used to extract the ISO year from a given date. It returns an integer representing the year based on the ISO week numbering system.

The ISO year represents the year that aligns with the ISO 8601 standard for week numbering, where each week starts on a Monday, and the first week of the year is the week that contains the majority of days of the new year.

The syntax of the ISOYEAR function in Tableau is as follows:

ISOYEAR(date)

• date is the date value from which you want to extract the ISO year.

Here's an example to illustrate the usage of the ISOYEAR function in Tableau:

Suppose you have a dataset with a date field called "Order Date" containing various date values. To extract the ISO year from the "Order Date" field, you can use the ISOYEAR function as follows:

ISOYEAR([Order Date])

In this example, the ISOYEAR function is applied to the "Order Date" field. It will return an integer representing the ISO year for each date value in the "Order Date" field.

The resulting output will be a column of integers representing the ISO year for each corresponding date in the "Order Date" field.

The ISOYEAR function in Tableau is useful when you need to analyze or group data based on the ISO year component. You can use it to create visualizations or calculations that depend on the ISO year, such as analyzing yearly trends based on the ISO week numbering system.

It's important to note that the ISO year may differ from the calendar year in cases where the first or last week of a year contains days from the previous or next year.