Non-english Date format breaks ranged date/time display

I needed a date/time format to be in Chinese. Example: 2013年 4月 30日 - 13:00. Where 年 = Year, 月 = Month, 日 = date.
After creating a date format with chinese input Y年 n月 j日 - H:i, the time display got messed up.

To reproduce this bug:

1. Create a Date Format Y年 n月 j日 - H:i
2. Add a Date Type Chinese and select the Date Format from above
3. Create a Content Type with start and end date. Granularity to the minute.
4. Click on Manage Display tab. Change the date display to the Date Format type you have just created.
5. Create a Node from the new Content Type and enter a start date and end date with a difference of 1 hour. Example: 30 April 2013 - 13:00 AND 30 April 2013 - 14:00

The output: 2013年 4月 30日 - 13:00 年月日, which is wrong.

The correct output should be: 2013年 4月 30日 - 13:00 to 14:00

After digging into the module, I found out that the function date_formatter_process is not stripping non-english characters from the formatted time and timezone.

Thankfully, the Date API allowed me to quickly hook into and clean up the formatter with the non-english string(or whatever you call it).

function mymodule_date_formatter_dates_alter(&$dates) {
  $dates['value']['formatted_time'] = preg_replace('/[^\00-\255]+/u', '', $dates['value']['formatted_time']); // Strip non-english characters
  $dates['value2']['formatted_time'] = preg_replace('/[\s-]+/u', '', $dates['value2']['formatted_time']);// Strip hyphens and spaces
  $dates['value2']['formatted_time'] = preg_replace('/[^\00-\255]+/u', '', $dates['value2']['formatted_time']); // Strip non-english characters

  $dates['value']['formatted_timezone'] = preg_replace('/[^\00-\255]+/u', '', $dates['value2']['formatted_timezone']); // Strip non-english characters
  $dates['value2']['formatted_timezone'] = preg_replace('/[^\00-\255]+/u', '', $dates['value2']['formatted_timezone']); // Strip non-english characters
}