{:Decode various string representations of date and time to Tdatetime type.
 This function do all timezone corrections too! This function can decode lot of
  formats like:
 @longcode(#
 ddd, d mmm yyyy hh:mm:ss
 ddd, d mmm yy hh:mm:ss
 ddd, mmm d yyyy hh:mm:ss
 ddd mmm dd hh:mm:ss yyyy #)

and more with lot of modifications, include:
@longcode(#
Sun, 06 Nov 1994 08:49:37 GMT    ; RFC 822, updated by RFC 1123
Sunday, 06-Nov-94 08:49:37 GMT   ; RFC 850, obsoleted by RFC 1036
Sun Nov  6 08:49:37 1994         ; ANSI C's asctime() Format
#)
Timezone corrections known lot of symbolic timezone names (like CEST, EDT, etc.)
or numeric representation (like +0200). By convention defined in RFC timezone
 +0000 is GMT and -0000 is current your system timezone.}
function DecodeRfcDateTime(Value: string): TDateTime;