DH캘린더 공유링크: https://calendar.google.com/calendar/u/0?cid=ZGhrb3JlYWRoQGdtYWlsLmNvbQ
DH캘린더 공개 URL: https://calendar.google.com/calendar/embed?src=dhkoreadh%40gmail.com&ctz=Asia%2FSeoul
DH캘린더 공개주소(iCal): https://calendar.google.com/calendar/ical/dhkoreadh%40gmail.com/public/basic.ics