This function returns the year to which the week number belongs according to the environment variables. The week number ranges between 1 and approximately 52.
Syntax:
weekyear(timestamp [, first_week_day [, broken_weeks [, reference_day]]])
Return data type: integer
| Argument | Description |
|---|---|
| timestamp | The date or timestamp to evaluate. |
| first_week_day |
Specifies the day on which the week starts. If omitted, the value of variable FirstWeekDay is used. The possible values first_week_day are 0 for Monday, 1 for Tuesday, 2 for Wednesday, 3 for Thursday, 4 for Friday, 5 for Saturday, and 6 for Sunday. For more information about the system variable, see FirstWeekDay. |
| broken_weeks |
If you don't specify broken_weeks, the value of variable BrokenWeeks will be used to define if weeks are broken or not. For more information about the system variable, see BrokenWeeks |
| reference_day |
If you don't specify reference_day, the value of variable ReferenceDay will be used to define which day in January to set as reference day to define week 1. By default, Qlik Sense functions use 4 as the reference day. This means that week 1 must contain January 4, or put differently, that week 1 must always have at least 4 days in January. For more information about the system variable, see ReferenceDay |
The weekyear() function determines which week of a year a date falls into. It then returns the year corresponding to that week number.
If BrokenWeeks is set to 0 (false), weekyear() will return the same as year().
Diagram of weekyear() function's range
However, if the BrokenWeeks system variable is set to use unbroken weeks, week 1 must only contain a certain number of days in January based on the value specified in the ReferenceDay system variable.
For example, if a ReferenceDay value of 4 is used, week 1 must include at least four days in January. It is possible for week 1 to include dates in December of the previous year or for the final week number of a year to include dates in January of the following year. In situations like this, the weekyear() function will return a different value to the year() function.
Diagram of weekyear() function's range when using unbroken weeks
When to use it
The weekyear() function is useful when you would like to compare aggregations by years. For example, if you would like to see the total sales of products by year. The weekyear() function is chosen over year() when the user would like to retain consistency with the BrokenWeeks system variable in the app.
Regional settings
Unless otherwise specified, the examples in this topic use the following date format: MM/DD/YYYY. The date format is specified in the SET DateFormat statement in your data load script. The default date formatting may be different in your system, due to your regional settings and other factors. You can change the formats in the examples below to suit your requirements. Or you can change the formats in your load script to match these examples.
Default regional settings in apps are based on the regional system settings of the computer or server where Qlik Sense is installed. If the Qlik Sense server you are accessing is set to Sweden, the Data load editor will use Swedish regional settings for dates, time, and currency. These regional format settings are not related to the language displayed in the Qlik Sense user interface. Qlik Sense will be displayed in the same language as the browser you are using.
| Example | Result |
|---|---|
| weekyear('12/30/1996',0,0,4) | Returns 1997, because week 1 of 1997 starts on 12/30/1996 |
| weekyear('01/02/1997',0,0,4) | Returns 1997 |
| weekyear('12/28/1997',0,0,4) | Returns 1997 |
| weekyear('12/30/1997',0,0,4) | Returns 1998, because week 1 of 1998 starts on 12/29/1997 |
| weekyear('01/02/1999',0,0,4) | Returns 1998, because week 53 of 1998 ends on 01/03/1999 |
| Topic | Interaction |
|---|---|
| week - script and chart function | Returns an integer representing the week number according to ISO 8601 |
| year - script and chart function | Returns an integer representing the year when the expression is interpreted as a date according to the standard number interpretation. |
Example 1 - Broken weeks
Overview
Open the Data load editor and add the load script below to a new tab.
The load script contains:
-
A dataset containing a set of transactions for the last week of 2020 and first week of 2021 which is loaded into a table called ‘Transactions’.
-
The BrokenWeeks variable which is set to 1.
-
A preceding load which contains the following:
-
The weekyear() function, set as the field ‘week_year’ that returns the year in which the transactions took place.
-
The week() function, set as the field ‘week’ that shows the week number of each transaction date.
-
Load script
SET BrokenWeeks=1;
Transactions:
Load
*,
week(date) as week,
weekyear(date) as week_year
;
Load
*
Inline
[
id,date,amount
8176,12/28/2020,19.42
8177,12/29/2020,23.80
8178,12/30/2020,82.06
8179,12/31/2020,40.56
8180,01/01/2021,37.23
8181,01/02/2021,17.17
8182,01/03/2021,88.27
8183,01/04/2021,57.42
8184,01/05/2021,67.42
8185,01/06/2021,23.80
8186,01/07/2021,82.06
]; Results
Load the data and open a sheet. Create a new table and add these fields as dimensions:
-
id
-
date
-
week
-
week_year
| id | date | week | week_year |
|---|---|---|---|
| 8176 | 12/28/2020 | 53 | 2020 |
| 8177 | 12/29/2020 | 53 | 2020 |
| 8178 | 12/30/2020 | 53 | 2020 |
| 8179 | 12/31/2020 | 53 | 2020 |
| 8180 | 01/01/2021 | 1 | 2021 |
| 8181 | 01/02/2021 | 1 | 2021 |
| 8182 | 01/03/2021 | 2 | 2021 |
| 8183 | 01/04/2021 | 2 | 2021 |
| 8184 | 01/05/2021 | 2 | 2021 |
| 8185 | 01/06/2021 | 2 | 2021 |
| 8186 | 01/07/2021 | 2 | 2021 |
The ‘week_year’ field is created in the preceding load statement by using the weekyear() function and passing the date field as the function’s argument.
The BrokenWeeks system variable is set to 1 meaning that the app uses broken weeks. Week 1 begins on January 1.
Diagram of weekyear() function's range with the use of broken weeks
Transaction 8181 takes place on January 2, which is part of week 1. Therefore, it returns a value of 2021 for the ‘week_year’ field.
Example 2 - Unbroken weeks
Overview
Open the Data load editor and add the load script below to a new tab.
The load script contains:
-
A dataset containing a set of transactions for the last week of 2020 and first week of 2021 which is loaded into a table called ‘Transactions’.
-
The BrokenWeeks variable which is set to 0.
-
A preceding load which contains the following:
-
The weekyear() function, set as the field ‘week_year’ that returns the year in which the transactions took place.
-
The week() function, set as the field ‘week’ that shows the week number of each transaction date.
-
However, in this example, the company policy is to use unbroken weeks.
Load script
SET BrokenWeeks=0;
Transactions:
Load
*,
week(date) as week,
weekyear(date) as week_year
;
Load
*
Inline
[
id,date,amount
8176,12/28/2020,19.42
8177,12/29/2020,23.80
8178,12/30/2020,82.06
8179,12/31/2020,40.56
8180,01/01/2021,37.23
8181,01/02/2021,17.17
8182,01/03/2021,88.27
8183,01/04/2021,57.42
8184,01/05/2021,67.42
8185,01/06/2021,23.80
8186,01/07/2021,82.06
]; Results
Load the data and open a sheet. Create a new table and add these fields as dimensions:
-
id
-
date
-
week
-
week_year
| id | date | week | week_year |
|---|---|---|---|
| 8176 | 12/28/2020 | 53 | 2020 |
| 8177 | 12/29/2020 | 53 | 2020 |
| 8178 | 12/30/2020 | 53 | 2020 |
| 8179 | 12/31/2020 | 53 | 2020 |
| 8180 | 01/01/2021 | 53 | 2020 |
| 8181 | 01/02/2021 | 53 | 2020 |
| 8182 | 01/03/2021 | 1 | 2021 |
| 8183 | 01/04/2021 | 1 | 2021 |
| 8184 | 01/05/2021 | 1 | 2021 |
| 8185 | 01/06/2021 | 1 | 2021 |
| 8186 | 01/07/2021 | 1 | 2021 |
The BrokenWeeks system variable is set to 0 meaning that the application uses unbroken weeks. Therefore, week 1 is not required to begin on January 1.
Week 53 of 2020 continues until the end of January 2, 2021, with week 1 of 2020 beginning on Sunday, January 3, 2021.
Diagram of weekyear() function's range with the use of unbroken weeks
Transaction 8181 takes place on January 2, which is part of week 1. Therefore, it returns a value of 2021 for the ‘week_year’ field.
Example 3 - Chart object example
Overview
The same dataset and scenario as the first example are used.
However, in this example the dataset is unchanged and loaded into the application. The calculation that returns the week number of the year when the transactions took place is created as a measure in a chart in the app.
Load script
SET BrokenWeeks=1;
Transactions:
Load
*
Inline
[
id,date,amount
8176,12/28/2020,19.42
8177,12/29/2020,23.80
8178,12/30/2020,82.06
8179,12/31/2020,40.56
8180,01/01/2021,37.23
8181,01/02/2021,17.17
8182,01/03/2021,88.27
8183,01/04/2021,57.42
8184,01/05/2021,67.42
8185,01/06/2021,23.80
8186,01/07/2021,82.06
]; Results
Load the data and open a sheet. Create a new table and add these fields as dimensions:
-
id
-
date
To calculate the week that a transaction takes place in, create the following measure:
-
=week(date)
To calculate the year that a transaction takes place in based on the week number, create the following measure:
-
=weekyear(date)
| id | date | week | week_year |
|---|---|---|---|
| 8176 | 12/28/2020 | 53 | 2020 |
| 8177 | 12/29/2020 | 53 | 2020 |
| 8178 | 12/30/2020 | 53 | 2020 |
| 8179 | 12/31/2020 | 53 | 2020 |
| 8180 | 01/01/2021 | 1 | 2021 |
| 8181 | 01/02/2021 | 1 | 2021 |
| 8182 | 01/03/2021 | 2 | 2021 |
| 8183 | 01/04/2021 | 2 | 2021 |
| 8184 | 01/05/2021 | 2 | 2021 |
| 8185 | 01/06/2021 | 2 | 2021 |
| 8186 | 01/07/2021 | 2 | 2021 |
The ‘week_year’ field is created in the preceding load statement by using the weekyear() function and passing the date field as the function’s argument.
The BrokenWeeks system variable is set to 1 meaning that the app uses broken weeks. week 1 begins on January 1.
Diagram of weekyear() function's range with the use of broken weeks
Transaction 8181 takes place on January 2, which is part of week 1. Therefore, it returns a value of 2021 for the ‘week_year’ field.