This module provides functions to parse and format RFC 733 date and time strings (http://tools.ietf.org/html/rfc733#appendix-E).

The syntax is as follows:

 date-time   ::= [ day-of-week ", " ] date SP time ("-" | SP) zone
 day-of-week ::= "Monday"    | "Mon" | "Tuesday"  | "Tue"
               | "Wednesday" | "Wed" | "Thursday" | "Thu"
               | "Friday"    | "Fri" | "Saturday" | "Sat"
               | "Sunday"    | "Sun"
 date        ::= day ("-" | SP) month ("-" | SP) year
 day         ::= 2DIGIT
 year        ::= 2DIGIT | 4DIGIT
 month       ::= "January"   | "Jan" | "February" | "Feb"
               | "March"     | "Mar" | "April"    | "Apr"
               | "May"               | "June"     | "Jun"
               | "July"      | "Jul" | "August"   | "Aug"
               | "September" | "Sep" | "October"  | "Oct"
               | "November"  | "Nov" | "December" | "Dec"
 time        ::= hour [ ":" ] minute [ [ ":" ] second ]
 hour        ::= 2DIGIT
 minute      ::= 2DIGIT
 second      ::= 2DIGIT
 zone        ::= "GMT"              ; Universal Time
               | "NST"              ; Newfoundland: -3:30
               | "AST" | "ADT"      ; Atlantic    :  -4 /  -3
               | "EST" | "EDT"      ; Eastern     :  -5 /  -4
               | "CST" | "CDT"      ; Central     :  -6 /  -5
               | "MST" | "MDT"      ; Mountain    :  -7 /  -6
               | "PST" | "PDT"      ; Pacific     :  -8 /  -7
               | "YST" | "YDT"      ; Yukon       :  -9 /  -8
               | "HST" | "HDT"      ; Haw/Ala     : -10 /  -9
               | "BST" | "BDT"      ; Bering      : -11 / -10
               | "Z"                ; GMT
               | "A"                ;  -1
               | "M"                ; -12
               | "N"                ;  +1
               | "Y"                ; +12
               | ("+" | "-") 4DIGIT ; Local diff: HHMM