Question

我想在电子邮件发件人的时区收到收到的日期。用javax邮件可以吗？ message.getReceivedDate()会在我服务器的时区中返回日期。

Answer 1

据我所知，至少在Java 7中，Date类（通过itsel）没有原始时区的概念。因此，如果您想要访问邮件的原始时区，则应直接获取Date标题：message.getHeader("Date")。

根据RFC2822，此标头必须始终存在，必须包含时区，并且应以本地时间表示。因此，您必须解析该值并提取发件人时区。接下来，您只需将getReceivedDate转换为该时区。

RFC2822的摘录（用于解析Date标头）：

orig-date       =       "Date:" date-time CRLF
date-time       =       [ day-of-week "," ] date FWS 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
year            =       4*DIGIT / obs-year
month           =       (FWS month-name FWS) / obs-month
month-name      =       "Jan" / "Feb" / "Mar" / "Apr" /
                        "May" / "Jun" / "Jul" / "Aug" /
                        "Sep" / "Oct" / "Nov" / "Dec"
day             =       ([FWS] 1*2DIGIT) / obs-day
time            =       time-of-day FWS zone
time-of-day     =       hour ":" minute [ ":" second ]
hour            =       2DIGIT / obs-hour
minute          =       2DIGIT / obs-minute
second          =       2DIGIT / obs-second
zone            =       (( "+" / "-" ) 4DIGIT) / obs-zone

发件人时区的javax邮件getReceivedDate

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