Custom function creating event but adding 6 hours to event start time?

Everything in my function works properly except it keeps adding 6 hours to my start time. The event start date and time come from a custom date field in my Lead Record. I know this has been asked before but the solution provided didn't seem to work for me.

The event date/time in my lead record field is named 'Product Demo'. My code is below.

void new_event_demo ( int leadId, date product_demo, string meeting_id, string meeting_url )

leadDetails = zoho.crm.getRecordById("Leads",input.leadId);

start_time=input.product_demo.toTime();

end_time=start_time.addHour(1);

eventMap=map();

eventMap.put("Subject","Web Demo");

eventMap.put("SMOWNERID",ifnull(leadDetails.get("SMOWNERID"),""));

eventMap.put("Start DateTime",start_time);

eventMap.put("End DateTime",end_time);

eventMap.put("Meeting ID",input.meeting_id);

eventMap.put("Meeting Join URL",input.meeting_url);

eventMap.put("SEID",input.leadId);

eventMap.put("SEMODULE","Leads");

createEvent = zoho.crm.create("Events",eventMap);

info eventMap;

info createEvent;