시간대 변환기

This calculator uses the IANA Time Zone Database (also known as the Olson database), the authoritative source for timezone definitions used by virtually all modern operating systems, programming languages, and internet services. Timezone offsets are calculated relative to Coordinated Universal Time (UTC). The calculator automatically handles Daylight Saving Time (DST) transitions for regions that observe them, using the current rules in the IANA database. Conversions use JavaScript's built-in Intl.DateTimeFormat API with IANA timezone identifiers, ensuring accuracy with the system's timezone data. Data sources: IANA Time Zone Database (tzdata), maintained by a global community of contributors and updated multiple times per year to reflect legislative changes in timezone rules. Limitations: Timezone rules change when governments decide to alter their UTC offset or DST observance. Recent examples include Morocco, Turkey, and various Pacific Island nations changing their timezone rules. While the IANA database is updated promptly, there may be brief periods where very recent changes are not yet reflected. Historical timezone conversions may be less accurate for dates before systematic timezone standardization.