Example of how to find time conflicts.

conflict.groovy

@Grab(group='joda-time', module='joda-time', version='2.3')
import org.joda.time.DateTime

def eventList = [
    [ name: "Event One", startDate: new DateTime(2014,2,12,11,0,0), endDate: new DateTime(2014,2,12,12,0,0) ],
    [ name: "Event Two", startDate: new DateTime(2014,2,12,13,0,0), endDate: new DateTime(2014,2,12,14,0,0) ],
    [ name: "Event Three", startDate: new DateTime(2014,2,12,11,30,0), endDate: new DateTime(2014,2,12,12,30,0) ],
    [ name: "Event Four", startDate: new DateTime(2014,2,12,9,0,0), endDate: new DateTime(2014,2,12,10,0,0) ],
    [ name: "Event Five", startDate: new DateTime(2014,2,12,9,0,0), endDate: new DateTime(2014,2,12,10,0,0) ],
    [ name: "Event Six", startDate: new DateTime(2014,2,12,10,0,0), endDate: new DateTime(2014,2,12,11,0,0) ],
    [ name: "Event Seven", startDate: new DateTime(2014,2,12,9,0,0), endDate: new DateTime(2014,2,12,10,0,0) ]    
]

def conflicts = []

while (eventList.size() > 0) {
    def e1 = eventList.pop()
    for (def e2 : eventList) {    
        if (isConflict(e1,e2)) {
            if (!conflicts.contains(e1)) conflicts.push(e1)
            if (!conflicts.contains(e2)) conflicts.push(e2)
        }        
    }
}

def isConflict(a,b) {    
    if (a.startDate >= b.endDate) return false
    if (a.endDate <= b.startDate) return false
    return true
}

conflicts.each {
    println it
}