$ wget -S --spider http://www.ietf.org/rfc/rfc2616.txt 2>&1|grep "Last-Modified" |cut -d ":" -f2- |xargs -i date -d "{}"
1999年 6月 12日 土曜日 03:46:53 JST
Last-Modifiedを送ってこないページには使えないけど。。
More than 5 years have passed since last update.
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