[英]Why is my RFC 2822 date not parsed by chrono?
我正在編寫一些代碼來解析RSS feed,但是我對Abstruse Goose RSS feed有麻煩。 如果您查看該供稿,則日期將編碼為Mon, 06 Aug 2018 00:00:00 UTC
。 對我來說,它看起來像RFC 2822。
我試圖使用DateTime::parse_from_rfc2822
的DateTime::parse_from_rfc2822
解析它,但得到ParseError(NotEnough)
。
let pub_date = entry.pub_date().unwrap().to_owned();
return rfc822_sanitizer::parse_from_rfc2822_with_fallback(&pub_date)
.unwrap_or_else(|e| {
panic!(
"pub_date for item {:?} (value is {:?}) can't be parsed due to error {:?}",
&entry, pub_date, e
)
})
.naive_utc();
我做錯了什么嗎? 我需要以某種方式破解嗎?
我使用rfc822_sanitizer可以很好地解決錯誤的寫入錯誤(大部分時間)。 我認為這不會影響解析...但是誰知道呢?
RFC2822
/時間格式在RFC中很好地編碼為以下格式:
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
其中obs-zone
定義如下:
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
%d65-73 / ; Military zones - "A"
%d75-90 / ; through "I" and "K"
%d97-105 / ; through "Z", both
%d107-122 ; upper and lower case
滾動他們自己的時間戳生成庫時,很多人都會犯錯,這就是這一點-如何正確標記RFC2822
TZ偏移量。 UT
之所以如此,是因為UTC
和UT
不完全相同(一個具有額外的秒,另一個具有...四個變體!並且RFC沒有定義使用哪個變體;它們都完全不同) 。
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