When placing an '@' sign in a custom Date Format, it moves it to the end of the string.

As noted in the documentation and numerous other issues, you have to escape characters that are not a part of the date format string, i.e. \@.

Unfortunately this does not seem to be the case. I have a date formatter as D M j \@ H:i and the @ still shows at the end of the string when it is being written to the page.

I have also tried double escaping it (D M j \\@ H:i) and the same applies.

I have had a pick through some of the other issues, which seem to be more about the date being output twice. This is not the case for me.

Screengrabs:
format string
views date format selection
output

I have gone through the issue and found the reason why the '@' is appended at the end of the Date string. The issue was occurring in

  $date1 = str_replace($timezone, '', $date1);
 $date2 = str_replace($timezone, '', $date2);

I am submitting the patch for this issue but I think there must be a $replace array like in date_limit_format() at date_api.module which replaces such character from formatted timezone, formatted time etc. Any suggestion?

I believe this to be a duplicate of https://drupal.org/node/1976898

Creating a custom module with the code provided on the other issue fixed the problem for me. I didn't try the above patch but I too had this problem. Escaping a dash didn't work and no matter what I put in the formatter the non english character would end up at the end of the string.

Spelling error.

Thanks for the patch, we'll try to review it soon.

BTW when you upload a patch it helps to set the status to "needs review", that triggers the testbots and lets others know that there's something review.