How to add days to a date variable in a service task

Good day all.

I have a simple Service Task within my workflow that receives a parameter of “addInfoReceivedDate” which is passed into the Process via Postman call like such.

{
    "variables": {
        "lob": {
            "value": "Commercial",
            "type": "String"
        },
        "requestTerm": {
            "value": "Prospective",
            "type": "String"
        },
        "addInfoRequested": {
            "value": "true",
            "type": "Boolean"
        },
        "addInfoReceived": {
            "value": "true",
            "type": "Boolean"
        },
        "requestDate" : {
            "value" : "2020-08-08T00:10:00.165+0100",
            "type": "Date"
        },
        "addInfoReceivedDate" : {
            "value" : "2020-08-09T00:10:00.165+0100",
            "type": "Date"
        }
    }
 }

Then, within the Expression formula, I am simply trying to add 3 days to this date that is submitted to it like this.

${addInfoReceivedDate.plusDays(3).toDate()}

I am receiving an error to the effect of

Caused by: org.camunda.bpm.engine.impl.javax.el.MethodNotFoundException: Cannot find method plusDays with 1 parameters in class java.util.Date

at org.camunda.bpm.engine.impl.javax.el.BeanELResolver.invoke(BeanELResolver.java:476)

at org.camunda.bpm.engine.impl.el.AbstractElResolverDelegate.invoke(AbstractElResolverDelegate.java:97)

at org.camunda.bpm.engine.impl.javax.el.CompositeELResolver.invoke(CompositeELResolver.java:397)
at org.camunda.bpm.engine.impl.juel.AstMethod.invoke(AstMethod.java:91)
at org.camunda.bpm.engine.impl.juel.AstMethod.eval(AstMethod.java:75)
at org.camunda.bpm.engine.impl.juel.AstMethod.invoke(AstMethod.java:79)
at org.camunda.bpm.engine.impl.juel.AstMethod.eval(AstMethod.java:75)
at org.camunda.bpm.engine.impl.juel.AstEval.eval(AstEval.java:50)
at org.camunda.bpm.engine.impl.juel.AstNode.getValue(AstNode.java:26) at org.camunda.bpm.engine.impl.juel.TreeValueExpression.getValue(TreeValueExpression.java:114) at org.camunda.bpm.engine.impl.delegate.ExpressionGetInvocation.invoke(ExpressionGetInvocation.java:40) at org.camunda.bpm.engine.impl.delegate.DelegateInvocation.proceed(DelegateInvocation.java:58) at org.camunda.bpm.engine.impl.delegate.DefaultDelegateInterceptor.handleInvocationInContext(DefaultDelegateInterceptor.java:92) at org.camunda.bpm.engine.impl.delegate.DefaultDelegateInterceptor.handleInvocation(DefaultDelegateInterceptor.java:63) at org.camunda.bpm.engine.impl.el.JuelExpression.getValue(JuelExpression.java:60)

Does anyone know how I can accomplish this?

@solo812 try expression like this below:

${dateTime().withMillis(dueDateField.getTime()).plusDays(10).toDate()}

Deploy this bpmn and test: DateCalculationProcess.bpmn (2.9 KB)

Worked like a charm! Thanks aravindhrs