Reproduce:

• Have a Process with a generated start form with a date field with the following setup

<camunda:formField id="DateField" label="Some Date" type="date" datePattern="yyyy-MM-dd" />

• Open the Start Form of this process in Tasklist
• Use the Datepicker in the generated Start Form

Expected:

• Dates are in the specified datePattern

Observed:

• Dates are in dd/MM/yyyy format regardless of specified datePattern
• Trying to start a process with the wrong format causes error Could not parse value '13/04/2018' as date using date format 'yyyy-MM-dd'.

Hint:

• Looks like the date format is hardcoded