ClassCastException: Cannot turn the java.util.Date object

Getting the below error on Jira on-demand which appears to be coming from the timesheet gadget on our portal page.
An error occurred whilst rendering this message. Please contact the administrators, and 

inform them of this bug. Details: ------- 

org.apache.velocity.exception.MethodInvocationException: Invocation of method 'get' in 

class java.util.TreeMap threw exception java.lang.ClassCastException: Cannot turn the 

java.util.Date object: Mon Aug 31 00:00:00 MDT 2015 into an IssueKey at 

templates/timesheetgadget/timesheet-entry.vm[line 69, column 42] at 

org.apache.velocity.runtime.parser.node.ASTMethod.handleInvocationException(ASTM

ethod.java:337) at 

org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:284) at 

org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:26

2) at 

org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReference.java:4

70) at 

org.apache.velocity.runtime.parser.node.ASTExpression.evaluate(ASTExpression.java:

62) at 

org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:8

5) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72) at 

org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:8

7) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72) at 

org.apache.velocity.runtime.directive.Foreach.performIteration(Foreach.java:393) at 

org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:316) at 

org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:175) at 

org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336) at 

org.apache.velocity.runtime.directive.Parse.render(Parse.java:263) at 

org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:175) at 

org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72) at 

org.apache.velocity.runtime.directive.Foreach.performIteration(Foreach.java:393) at 

org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:316) at 

org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:175) at 

org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72) at 

org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:8

7) at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72) at 

org.apache.velocity.runtime.directive.Foreach.performIteration(Foreach.java:393) at 

org.apache.velocity.runtime.directive.Foreach.render(Foreach.java:316) at
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