start date of item from pubDate
start date of item from pubDate

#1621
pubDate는 이전날 18시가 최종으므로, 오늘부터 하면 안되고 pubdate 기준으로 해야함.
land와 temp의 pubDate가 다른 경우(gathering failed) 대비 적용
과거 데이터가 있는 경우에만 과거 데이터 채움.

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