WordPress在哪里获得夏令时信息
我的问题是，WordPress从哪些地方获得与自动时区和DST变化相关的数据，以及如何实现相同的委托人将用户选择的本地日期和时间转换为存储的偏移以允许他们移动时钟的前后移动在夏令时？
很显然，我可以将它存储为UTC，然后将时间转换为当地时区，但如果它们在创建记录时处于相反的夏令时设置中，它仍不能准确反映它们输入的日期和时间。 我正在使用asp.net c＃与sql服务器。
WordPress通过选择一个城市自动反映夏令时，而不是在WP-admin>设置>常规>时区中偏移小时。 你会看到这样的通知：
This timezone is currently in daylight saving time.
Standard time begins on: Sunday 25.10. 04:00,
它位于/wp-admin/options-general.php的代码中
<?php
$current_offset = get_option('gmt_offset');
$tzstring = get_option('timezone_string');
$check_zone_info = true;
// Remove old Etc mappings. Fallback to gmt_offset.
if ( false !== strpos($tzstring,'Etc/GMT') )
$tzstring = '';
if ( empty($tzstring) ) { // Create a UTC+- zone if no timezone string exists
$check_zone_info = false;
if ( 0 == $current_offset )
$tzstring = 'UTC+0';
elseif ($current_offset < 0)
$tzstring = 'UTC' . $current_offset;
else
$tzstring = 'UTC+' . $current_offset;
}
?>
<th scope="row"><label for="timezone_string"><?php _e('Timezone') ?></label></th>
<td>
<select id="timezone_string" name="timezone_string" aria-describedby="timezone-description">
<?php echo wp_timezone_choice( $tzstring, get_user_locale() ); ?>
</select>
<p class="description" id="timezone-description"><?php _e( 'Choose either a city in the same timezone as you or a UTC timezone offset.' ); ?></p>
<p class="timezone-info">
<span id="utc-time"><?php
/* translators: 1: UTC abbreviation, 2: UTC time */
printf( __( 'Universal time (%1$s) is %2$s.' ),
'<abbr>' . __( 'UTC' ) . '</abbr>',
'<code>' . date_i18n( $timezone_format, false, true ) . '</code>'
);
?></span>
<?php if ( get_option( 'timezone_string' ) || ! empty( $current_offset ) ) : ?>
<span id="local-time"><?php
/* translators: %s: local time */
printf( __( 'Local time is %s.' ),
'<code>' . date_i18n( $timezone_format ) . '</code>'
);
?></span>
<?php endif; ?>
</p>
<?php if ( $check_zone_info && $tzstring ) : ?>
<p class="timezone-info">
<span>
<?php
// Set TZ so localtime works.
date_default_timezone_set($tzstring);
$now = localtime(time(), true);
if ( $now['tm_isdst'] )
_e('This timezone is currently in daylight saving time.');
else
_e('This timezone is currently in standard time.');
?>
<br />
<?php
$allowed_zones = timezone_identifiers_list();
if ( in_array( $tzstring, $allowed_zones) ) {
$found = false;
$date_time_zone_selected = new DateTimeZone($tzstring);
$tz_offset = timezone_offset_get($date_time_zone_selected, date_create());
$right_now = time();
foreach ( timezone_transitions_get($date_time_zone_selected) as $tr) {
if ( $tr['ts'] > $right_now ) {
$found = true;
break;
}
}
if ( $found ) {
echo ' ';
$message = $tr['isdst'] ?
/* translators: %s: date and time */
__( 'Daylight saving time begins on: %s.') :
/* translators: %s: date and time */
__( 'Standard time begins on: %s.' );
// Add the difference between the current offset and the new offset to ts to get the correct transition time from date_i18n().
printf( $message,
'<code>' . date_i18n(
__( 'F j, Y' ) . ' ' . __( 'g:i a' ),
$tr['ts'] + ( $tz_offset - $tr['offset'] )
) . '</code>'
);
} else {
_e( 'This timezone does not observe daylight saving time.' );
}
}
// Set back to UTC.
date_default_timezone_set('UTC');
?>
</span>
$now = localtime(time(), true);
if ( $now['tm_isdst'] )
_e('This timezone is currently in daylight saving time.');
else
_e('This timezone is currently in standard time.');
我会使用localtime函数，无论出现哪个库。
- 编辑 - 我也会注意到这些行：
// Set TZ so localtime works.
date_default_timezone_set($tzstring);
那些可能是必要的，我不知道，我不写PHP。
链接地址: http://www.djcxy.com/p/5007.html