How to calculate hour ranges using apex in Salesforce?

Sample Trigger:

trigger MemberSample on Member__c (before insert, before update) {
    for(Member__c mem : trigger.New) {
        Double var = Math.Floor((Double.valueOf(mem.End__c.getTime()) - Double.valueOf(mem.Start__c.getTime())) / (1000.0*60.0*60.0));
        mem.Description__c = String.valueOf(var);
    }

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