DATERANGE() function uses wrong start/end day for the WEEK range

Scenario:

In your report or ad hoc template you're using DATERANGE() function to construct a date range from a string (i.e. DAY, WEEK, MONTH, etc.) When report with such function is deployed on the JasperServer, for the WEEK value the start and end of the week is incorrect: server is configured for start to be Monday and end to be Sunday but the start is Saturday and end is Sunday. How to avoid this problem?

Solution:

the DATERANGE() function builds the Date Range object with report locale instead of the bundle that is specified in the JRS. It's a built-in JasperReports function that is separate from JasperServer.

You could try constructing a date range in the following fashion:
new net.sf.jasperreports.types.date.DateRangeBuilder((String) $F{value}).set($P{REPORT_TIME_ZONE}).toDateRange()