time difference

Thanks; I put the feedback in the following groovy script:

def distretto = context.expand( '${#Global#distretto}' )
def Path_UDB = context.expand( '${#Global#Path_UDB}' )
def testDataSet = []
def failureList = []
def fileName = "${Path_UDB}\\VDCRTG\\data_cap_${distretto}.txt"
new File(fileName).eachLine { line -> testDataSet.add( line.split(",") ) }
context.setProperty( "failureList", failureList )
context.setProperty( "testDataSet", testDataSet )
context.setProperty( "index", 0 )
def testDataSet1 = context.getProperty("testDataSet")
def index = context.getProperty("index")
def testDataLine = testDataSet1[index]
def props = testRunner.testCase.getTestStepByName( "Properties" )
props.setPropertyValue("data_cap", testDataLine[0])
newDate = new Date()
log.info ("newDate = $newDate")
baseDate = props.getPropertyValue("data_cap")
log.info ("baseDate = $baseDate")
if( newDate >= (baseDate + 10))
{
props.setPropertyValue("timer", "25000")
log.info '10 days passed from previous CAP'
f = new File("${Path_UDB}\\VDCRTG\\data_cap_${distretto}.txt")
f.write("$newDate")
}
else
{
props.setPropertyValue("timer", "1000")
}

When I execute it, I have the following error: Wed Feb 27 11:15:31 CET 2013:ERROR:An error occured [java.lang.String cannot be cast to java.util.Date], see error log for details
Wed Feb 27 11:15:31 CET 2013:ERROR:java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Date
java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Date
at java.util.Date.compareTo(Unknown Source)
at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.compareToWithEqualityCheck(DefaultTypeTransformation.java:570)
at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.compareTo(DefaultTypeTransformation.java:525)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.compareTo(ScriptBytecodeAdapter.java:688)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.compareGreaterThanEqual(ScriptBytecodeAdapter.java:709)
at Script14.run(Script14.groovy:19)
at com.eviware.soapui.support.scripting.groovy.SoapUIGroovyScriptEngine.run(SoapUIGroovyScriptEngine.java:96)
at com.eviware.soapui.impl.wsdl.teststeps.WsdlGroovyScriptTestStep.run(WsdlGroovyScriptTestStep.java:149)
at com.eviware.soapui.impl.wsdl.panels.teststeps.GroovyScriptStepDesktopPanel$RunAction$1.run(GroovyScriptStepDesktopPanel.java:274)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)