Date and time occur in several header fields. This section specifies the syntax for a full date and time specification. Though folding white space is permitted throughout the date-time specification, it is RECOMMENDED that a single space be used in each place that FWS appears (whether it is required or optional); some older implementations may not interpret other occurrences of folding white space correctly.
date-time = [ day-of-week "," ] date FWS time [CFWS] #日期-时间的格式是: [周几,(可选)] 日期 空白符 时间 空白符
随手看一手php文档中的时间格式: const string RFC2822 = "D, d M Y H:i:s O" ; D 代表的是Day of week,d表示 day,M表示Month,Y表示Year,H表示Hour,i表示minute,s表示second,O表示Zone
>Mon, 15 Aug 2005 15:52:01 +0000 上面就是一个 RFC 2822时间的样例