php datetime ai_generated true

Fatal error: Uncaught Exception: DateTimeZone::__construct(): Unknown or bad timezone (US/Pacific-New) in /var/www/app/src/Utils/DateHelper.php:18

ID: php/timezone-invalid

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92%Fix Rate
94%Confidence
50Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
83 active — — —

Root Cause

Invalid timezone errors occur when PHP encounters an unrecognized timezone identifier. This can happen due to deprecated timezone names (e.g., US/Pacific-New), missing timezone database, user input with invalid timezones, or mismatched ICU/IANA timezone data.

generic

Workarounds

  1. 95% success Use IANA timezone identifiers and validate user input against timezone_identifiers_list() 
    Always use canonical IANA names like 'America/New_York', 'Europe/London', 'Asia/Tokyo'. Validate user-provided timezones: if (!in_array($tz, timezone_identifiers_list())) { throw new InvalidArgumentException('Invalid timezone'); }
  2. 90% success Set a default timezone in php.ini and application configuration 
    In php.ini: date.timezone = UTC. In application bootstrap: date_default_timezone_set('UTC'). Store all datetimes in UTC in the database and convert to the user's timezone only for display.

Dead Ends

Common approaches that don't work:

  1. Using timezone abbreviations (EST, PST, CST) instead of IANA identifiers 75% fail

    Timezone abbreviations are ambiguous. CST can mean Central Standard Time (US), China Standard Time, or Cuba Standard Time. PHP may resolve them incorrectly, causing silent data corruption in date calculations.

  2. Hardcoding UTC offset like +05:30 instead of using named timezones 60% fail

    Fixed UTC offsets do not account for daylight saving time transitions. Using +05:30 instead of Asia/Kolkata works for India, but using -05:00 instead of America/New_York will be wrong for half the year.

Error Chain

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