PHP：如何将字符串格式的日期+时间转换为适合排序数据的格式？

I am loading articles from RSS and there is the date value formatted in various as:

January 4, 2013
Fri, 04 Jan 2013 13:18:05 +0000
Fri, 04 Jan 2013 07:33:51 EST
Jan 4, 2013
Fri, 04 Jan 2013 02:27:46 GMT

Is there any uniform way, how to save these values into the database column with datatype DATETIME, TIMESTAMP or TIME, which is the most appropriate for sorting these articles?

You can try like this-

echo date("Y-m-d H:i:s",strtotime("January 4, 2013"));  //  2013-01-04 00:00:00
echo date("Y-m-d H:i:s",strtotime("Fri, 04 Jan 2013 13:18:05 +0000"));  //2013-01-04 13:18:05
echo date("Y-m-d H:i:s",strtotime("Fri, 04 Jan 2013 07:33:51 EST"));    //2013-01-04 12:33:51
echo date("Y-m-d H:i:s",strtotime("Jan 4, 2013"));  //2013-01-04 00:00:00
echo date("Y-m-d H:i:s",strtotime("Fri, 04 Jan 2013 02:27:46 GMT"));    //2013-01-04 02:27:46

updated datetime format.

Use strtotime function. http://php.net/manual/en/function.strtotime.php

date("Y-m-d H:i:s", strtotime($dateString));