Possible way to override locale format?

[sunglee]

With en_US locale setting, everything else output for calendar() function is m/d/Y which will display 04/09/2014 for example. Is there a way to override this output format to be n/j/y to display 4/9/14?

I tried to find a function which can override default locale format, but it seems like it is not available. (maybe I am wrong.)

Thanks for your input how to do this.