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This is a followup spec to RFC822.<p> This class does not take pattern strings. It always formats the date based on the specification below.<p> 3.3 Date and Time Specification<p> Date and time occur in several header fields of a message. This section specifies the syntax for a full date and time specification. Though folding whitespace is permitted throughout the date-time specification, it is recommended that only a single space be used where FWS is required and no space be used where FWS is optional in the date-time specification; some older implementations may not interpret other occurrences of folding whitespace correctly.<p> date-time = [ day-of-week "," ] date FWS time [CFWS]<p> day-of-week = ([FWS] day-name) / obs-day-of-week<p> day-name = "Mon" / "Tue" / "Wed" / "Thu" / "Fri" / "Sat" / "Sun"<p> date = day month year<p> year = 4*DIGIT / obs-year<p> month = (FWS month-name FWS) / obs-month<p><pre>month-name = "Jan" / "Feb" / "Mar" / "Apr" / "May" / "Jun" / "Jul" / "Aug" / "Sep" / "Oct" / "Nov" / "Dec" </pre><p> day = ([FWS] 1*2DIGIT) / obs-day<p> time = time-of-day FWS zone<p> time-of-day = hour ":" minute [ ":" second ]<p> hour = 2DIGIT / obs-hour<p> minute = 2DIGIT / obs-minute<p> second = 2DIGIT / obs-second<p> zone = (( "+" / "-" ) 4DIGIT) / obs-zone<p> The day is the numeric day of the month. The year is any numeric year in the common era.<p> The time-of-day specifies the number of hours, minutes, and optionally seconds since midnight of the date indicated.<p> The date and time-of-day SHOULD express local time.<p> The zone specifies the offset from Coordinated Universal Time (UTC, formerly referred to as "Greenwich Mean Time") that the date and time-of-day represent. The "+" or "-" indicates whether the time-of-day is ahead of or behind Universal Time. The first two digits indicate the number⌨️ 快捷键说明
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