Timezone Not Set

Why This Happens

PHP needs a default timezone for date/time functions. When neither php.ini's date.timezone nor date_default_timezone_set() specifies one, PHP falls back to the system timezone and raises this warning. This can cause inconsistent behavior across different servers.

The Problem

echo date('Y-m-d H:i:s'); // Warning if timezone not configured

The Fix

// In php.ini: date.timezone = UTC
// Or in code:
date_default_timezone_set('UTC');
echo date('Y-m-d H:i:s');

// Or use DateTimeImmutable with explicit timezone:
$now = new DateTimeImmutable('now', new DateTimeZone('UTC'));

Step-by-Step Fix

1. 1

   Set timezone in php.ini

   Add date.timezone = UTC (or your preferred timezone) to php.ini for a server-wide setting.

2. 2

   Set in application bootstrap

   Call date_default_timezone_set('UTC') in your application's bootstrap file as an application-level setting.

3. 3

   Use explicit timezones

   Pass timezone objects explicitly when creating DateTime/DateTimeImmutable instances for maximum clarity.