Avoiding Data Type Mismatches: How to Properly Handle Date Parameters in Dashboard Expressions

When working with dashboard parameters to create multiple views based on the same dataset, users may encounter errors related to data type mismatches. A common issue arises when a date parameter is treated as a string, leading to unexpected behavior in expressions.

Handling parameters by casting

1. Create Parameter with date format yyyy/MM/dd.
   
   
2. Convert the parameter from a string to a date type. This can be achieved by using the CAST function in your expression. Here’s an example of how to implement this:

IF([date] > CAST(@{{:Date.START}} AS date), 'True', 'False')

In this expression:

• [date] is the date field being evaluated.
• @{{:Date.START}} is the parameter that needs to be converted to a datetime format.
• The CAST function is used to convert the parameter to the appropriate date type, allowing for accurate comparisons.

Additional Tips

• Always ensure that the data types of parameters match the expected types in your expressions to avoid errors.
• If you continue to experience issues, double-check the format of the date being passed into the parameter and ensure it aligns with the expected format in your database or application.

References

• Dashboard parameters
• Configuring Expressions