Same moment. Different calendar day.

A concert announcement may use Korean Standard Time, a venue’s local time, or more than one time zone. The first question is not “How many hours do I subtract?” It is “Which clock does this particular date and time belong to?”

Start from the exact source

Read the heading and footnotes around the deadline. Do not assume every date in a notice uses the artist’s home time zone. An international tour may list a registration cutoff in KST and a sale in venue-local time. The official TWS Macau ticket notice, for example, presents registration times in both KST and local time, then labels sale times as local. Always preserve the label next to the time.

FanWindow currently uses one source time zone for a timeline. If a notice mixes zones, first convert each deadline to the same verified source zone, or make separate timelines. Do not copy venue-local times into a timeline labeled Asia/Seoul unless you have converted them.

Choose a place-based time zone

Use an IANA identifier such as Asia/Seoul, Europe/London, or America/Los_Angeles. These identifiers describe civil-time rules for a region. A bare abbreviation can be ambiguous, while a fixed offset does not describe changes across seasons. KST in a current Korean event notice corresponds to Asia/Seoul, currently UTC+09:00.

The IANA time-zone database tracks regional offsets and rule changes. Your browser and operating system supply the time-zone data used by the app. Keep them updated, especially when an event is far in the future or a government has recently changed clock rules.

Check the date, not just the hour

Here is a fictional example: 1 January 2027 at 00:30 in Seoul is 31 December 2026 at 15:30 UTC. A fan in Los Angeles sees 31 December at 07:30 under the currently published rules. The event did not move. The local calendar date changed.

This is why FanWindow displays a full date beside the local time and keeps the source time underneath. When checking a shared schedule, read both. A time like 00:30 is shortly after the start of that date, not the end of the previous evening.

What happens when you change the display zone?

FanWindow saves each deadline as an exact UTC instant. Choosing another viewing time zone changes how that instant is displayed. It does not reschedule the event. The .ics export also carries the UTC instant, so your calendar can display it in the calendar’s selected zone.

The editor is different: its dates and times are the words you transcribe from the source. Changing the source zone reinterprets those entered wall-clock times. Always preview and verify again after changing it.