dlrs_EventTrigger with ActivityDate mod

/**
 * Auto Generated and Deployed by the Declarative Lookup Rollup Summaries Tool package (dlrs)
 **/
trigger dlrs_EventTrigger on Event
    (before delete, before insert, before update, after delete, after insert, after undelete, after update)
{
    if (Trigger.isBefore && (Trigger.isInsert || Trigger.isUpdate)) {
        for (Event eachEvent : Trigger.new) {
            eachEvent.ActivityDateProxy__c =
                eachEvent.ActivityDateTime == null  // Handle all-day events from Outlook
                    ? eachEvent.ActivityDate
                    : eachEvent.ActivityDateTime.dateGMT();
        }
    }

    dlrs.RollupService.triggerHandler();
}