9 calls to system_time_zones()

AccountForm::form in core/modules/user/src/AccountForm.php
Date::buildOptionsForm in core/modules/views/src/Plugin/views/field/Date.php
DateTimeFormatterBase::settingsForm in core/modules/datetime/src/Plugin/Field/FieldFormatter/DateTimeFormatterBase.php
RegionalForm::buildForm in core/modules/system/src/Form/RegionalForm.php
SiteConfigureForm::buildForm in core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php
TimestampFormatter::settingsForm in core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/TimestampFormatter.php
TimezoneTest::testSystemTimeZones in core/modules/system/tests/src/Kernel/Timezone/TimezoneTest.php
Tests system_time_zones().
User::getAllowedTimezones in core/modules/user/src/Entity/User.php
Defines allowed timezones for the field's AllowedValues constraint.
UserUpdate7002::__construct in core/modules/user/src/Plugin/migrate/process/d6/UserUpdate7002.php

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