Time is an illusion (lunchtime doubly so)
summary
Time zones are political and change often: the tz database is at version 2018.5 here, PHP shows 143 historic transitions for zones, and the abbreviation CEST maps to 51 different zone identifiers, so offsets alone are useless. Use DateTimeImmutable with real IANA names (DateTimeZone) and keep server-time as UTC; store UTC datetime plus the timezone name separately so conversions stay correct. Update the tzdb via PHP releases or the pecl timezonedb and render client-side with Moment.js or geolocation-derived zones.
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chapters (4)
- 0:00Start
- 17:53Daylight Saving Time
- 20:21Summary • Timezones are political definitions
- 23:12Timezone informations change
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