UTC vs Local Midnight — Why “Today” Moves

UTC is a stable civil-time baseline. Local midnight depends on your offset and daylight saving rules. That is why “today in Tokyo” and “today in New York” overlap awkwardly.

Scheduling tip

Store absolute instants (epoch + zone) for meetings. Storing “9:00 local” without a zone is fragile for distributed teams.

Pair this mental model with the Timezone Converter when planning releases or calls across regions.