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- ; Dates
- date-century = 2DIGIT ; 00-99
- date-decade = DIGIT ; 0-9
- date-subdecade = DIGIT ; 0-9
- date-year = date-decade date-subdecade
- date-fullyear = date-century date-year
- date-month = 2DIGIT ; 01-12
- date-wday = DIGIT ; 1-7 ; 1 is Monday, 7 is Sunday
- date-mday = 2DIGIT ; 01-28, 01-29, 01-30, 01-31 based on
- ; month/year
- date-yday = 3DIGIT ; 001-365, 001-366 based on year
- date-week = 2DIGIT ; 01-52, 01-53 based on year
- datepart-fullyear = [date-century] date-year ["-"]
- datepart-ptyear = "-" [date-subdecade ["-"]]
- datepart-wkyear = datepart-ptyear / datepart-fullyear
- dateopt-century = "-" / date-century
- dateopt-fullyear = "-" / datepart-fullyear
- dateopt-year = "-" / (date-year ["-"])
- dateopt-month = "-" / (date-month ["-"])
- dateopt-week = "-" / (date-week ["-"])
- datespec-full = datepart-fullyear date-month ["-"] date-mday
- datespec-year = date-century / dateopt-century date-year
- datespec-month = "-" dateopt-year date-month [["-"] date-mday]
- datespec-mday = "--" dateopt-month date-mday
- datespec-week = datepart-wkyear "W"
- (date-week / dateopt-week date-wday)
- datespec-wday = "---" date-wday
- datespec-yday = dateopt-fullyear date-yday
- date = datespec-full / datespec-year / datespec-month /
- datespec-mday / datespec-week / datespec-wday / datespec-yday
- ; Times
- time-hour = 2DIGIT ; 00-24
- time-minute = 2DIGIT ; 00-59
- time-second = 2DIGIT ; 00-58, 00-59, 00-60 based on
- ; leap-second rules
- time-fraction = ("," / ".") 1*DIGIT
- time-numoffset = ("+" / "-") time-hour [[":"] time-minute]
- time-zone = "Z" / time-numoffset
- timeopt-hour = "-" / (time-hour [":"])
- timeopt-minute = "-" / (time-minute [":"])
- timespec-hour = time-hour [[":"] time-minute [[":"] time-second]]
- timespec-minute = timeopt-hour time-minute [[":"] time-second]
- timespec-second = "-" timeopt-minute time-second
- timespec-base = timespec-hour / timespec-minute / timespec-second
- time = timespec-base [time-fraction] [time-zone]
- iso-date-time = date "T" time
- ; Durations
- dur-second = 1*DIGIT "S"
- dur-minute = 1*DIGIT "M" [dur-second]
- dur-hour = 1*DIGIT "H" [dur-minute]
- dur-time = "T" (dur-hour / dur-minute / dur-second)
- dur-day = 1*DIGIT "D"
- dur-week = 1*DIGIT "W"
- dur-month = 1*DIGIT "M" [dur-day]
- dur-year = 1*DIGIT "Y" [dur-month]
- dur-date = (dur-day / dur-month / dur-year) [dur-time]
- duration = "P" (dur-date / dur-time / dur-week)
- ; Periods
- period-explicit = iso-date-time "/" iso-date-time
- period-start = iso-date-time "/" duration
- period-end = duration "/" iso-date-time
- period = period-explicit / period-start / period-end
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