laravel 基于时区的碳上两次时间的差异（以秒为单位）
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Difference between two times in seconds on carbon based on timezone
提问by sumit
I want to find out the difference between 2 times for the different timezone. My server is based on Sydney and I want to find the difference between given time and current time(based on Perth) in seconds
我想找出不同时区的 2 次之间的差异。我的服务器基于悉尼，我想以秒为单位找到给定时间和当前时间（基于珀斯）之间的差异
echo $tz = Carbon::now('Australia/Perth');
echo "<br>";
$local='2017-04-11 12:39:50';
echo $emitted = Carbon::parse($local);
echo "<br>";
echo "diff from carbon->";
echo $diff = $tz->diffInSeconds($emitted);
echo "<br> diff from Normal->";
echo $diff1 = strtotime($tz) - strtotime($emitted);
When I used diffInSecondsit gave 2 hours difference and looks like localisation is not taken consideration
but strtotime($tz) - strtotime($emitted)gives perfect result. Any thing I missed?
当我使用diffInSeconds它时，它给出了 2 小时的差异，看起来没有考虑本地化，但strtotime($tz) - strtotime($emitted)给出了完美的结果。我错过了什么吗？
回答by shock_gone_wild
You have to tell Carbon which timezone is used for the string that should be parsed. The strtotime function is not the right choice for you I think, because it always consideres the parsed strings to be using the timezone from default_timezone_get()
您必须告诉 Carbon 哪个时区用于应该解析的字符串。我认为 strtotime 函数不是您的正确选择，因为它始终认为解析的字符串使用default_timezone_get() 中的时区
For example:
例如：
echo $now = Carbon::now('Australia/Perth');
echo "<br>";
echo $emitted = Carbon::parse($now, 'Australia/Sydney');
echo "<br>";
echo "diff from carbon->";
echo $diff = $now->diffInSeconds($emitted);
echo "<br> diff from Normal->";
echo $diff1 = strtotime($now) - strtotime($emitted);
Would result in :
会导致：
diff from carbon->7200
diff from Normal->0
The normal diff is obviously wrong as $emitted is supposed to use 'Australia/Sydney' and $now is supposed to use 'Australia/Perth'. But as the two variables have the exact same string representation the diff is 0. (The information about the different timezones is lost).
正常的差异显然是错误的，因为 $emitted 应该使用“Australia/Sydney”，而 $now 应该使用“Australia/Perth”。但是由于这两个变量具有完全相同的字符串表示形式，因此差异为 0。（有关不同时区的信息丢失）。
The diff with Carbon however shows the correct difference of 7200 Seconds (= 2 hours ) which is the real difference between Australia/Sydney and Australia/Perth
然而，与 Carbon 的差异显示了 7200 秒（= 2 小时）的正确差异，这是澳大利亚/悉尼和澳大利亚/珀斯之间的真正差异
By default all the date and date-time functions (including Carbon) are using the value from the timezonevariable in your config/app.phpfile.
默认情况下，所有日期和日期时间函数（包括 Carbon）都使用config/app.php文件中时区变量的值。
