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ABNF Notation
ABNF for IMF – Internet Message Format –
RFC 5322
Message Format
Fields
Address
Date‑Time
Lexical Tokens
IMF — Date and Time
RFC 5322 – Section 3.3
–
Section 4.3
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*2
DIGIT
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
zone
time-of-day
=
hour
"
:
"
minute
[ "
:
"
second
]
hour
=
2
DIGIT
/
obs-hour
minute
=
2
DIGIT
/
obs-minute
second
=
2
DIGIT
/
obs-second
zone
=
(
FWS
( "
+
" / "
-
" ) 4
DIGIT
) /
obs-zone
obs-day-of-week
=
[
CFWS
]
day-name
[
CFWS
]
obs-day
=
[
CFWS
] 1*2
DIGIT
[
CFWS
]
obs-year
=
[
CFWS
] 2*
DIGIT
[
CFWS
]
obs-hour
=
[
CFWS
] 2
DIGIT
[
CFWS
]
obs-minute
=
[
CFWS
] 2
DIGIT
[
CFWS
]
obs-second
=
[
CFWS
] 2
DIGIT
[
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
%d65-73 / %d75-90 /
%d97-105 / %d107-122