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ABNF for IMF – Internet Message Format – RFC 5322

Message Format   Fields   Address   Date‑Time   Lexical Tokens

date-time   =
day-of-week   "," ]   date   time   [ CFWS ]

day-of-week   =
( [ FWS ]   day-name )  /  obs-day-of-week

day-name   =
"Mon"  /  "Tue"  /  "Wed"  /  "Thu"  /  "Fri"  /  "Sat"  /  "Sun"

date   =
day   month   year

day   =
( [ FWS ]   1*2DIGIT   FWS )  /  obs-day

month   =
"Jan"  /  "Feb"  /  "Mar"  /  "Apr"  /  "May"  /  "Jun"  /
"Jul"  /  "Aug"  /  "Sep"  /  "Oct"  /  "Nov"  /  "Dec"

year   =
FWS   4*DIGIT   FWS )  /  obs-year

time   =
time-of-day   =
hour   ":"   minute   [ ":"   second ]

hour   =
2DIGIT  /  obs-hour

minute   =
2DIGIT  /  obs-minute

second   =
2DIGIT  /  obs-second

zone   =
FWS   ( "+"  /  "-" )   4DIGIT )  /  obs-zone

obs-day-of-week   =
CFWS ]   day-name   [ CFWS ]

obs-day   =
CFWS ]   1*2DIGIT   [ CFWS ]

obs-year   =
CFWS ]   2*DIGIT   [ CFWS ]

obs-hour   =
CFWS ]   2DIGIT   [ CFWS ]

obs-minute   =
CFWS ]   2DIGIT   [ CFWS ]

obs-second   =
CFWS ]   2DIGIT   [ CFWS ]

obs-zone   =
"UT"  /  "GMT"  /      ;  Universal Time
; North American UT offsets
"EST"  /  "EDT"  /      ;  Eastern: - 5/ - 4
"CST"  /  "CDT"  /      ;  Central: - 6/ - 5
"MST"  /  "MDT"  /      ;  Mountain: - 7/ - 6
"PST"  /  "PDT"  /      ;  Pacific: - 8/ - 7
; Military zones -
; "A" through "I" and "K" through "Z",
; both upper and lower case

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