fmt_httpdate - write a date in ASCII as in the HTTP protocol

       fmt_httpdate  writes  a  date  in ASCII representation as the HTTP protocol defines it: "Sun, 06 Nov 1994
       08:49:37 GMT".

       fmt_httpdate does not append \0.

       If dest equals FMT_LEN (i.e. is zero), fmt_httpdate returns the number of bytes it would have written.

       The output of fmt_httpdate is 29 until Jan 1st 10000.

                                                                                                 fmt_httpdate(3)

       fmt_httpdate - write a date in ASCII as in the HTTP protocol

#include<libowfat/fmt.h>

       size_t fmt_httpdate(char *dest,time_t source);