zipToTimeZoneMap = new Map<String, String>();

        for(Opportunity o :activelyWorkingoppsData)
        {
            String timeDiff = zipToTimeZoneMap.get(o.postal_code__c);
            System.debug('o.postal_code__c=================>'+o.postal_code__c);
            TimeZone__c tz = TimeZone__c.getValues(o.postal_code__c);
            System.debug(tz);
            integer d;

            if(tz!=null){
                d = integer.ValueOf(tz.TimeDiff__c);

                    System.debug('integerD===========>'+d+'integerTZ==='+tz);
                    localTime = system.Now().addHours(d).format('h:mm a');
                    zipToTimeZoneMap.put(o.postal_code__c,localTime);
                    System.debug('zipToTimeZoneMap=================>'+zipToTimeZoneMap);
                }

        }