Database of Old Diaries in the Heian Period

Kundoku version ("Japanese" or explanation reading) "Mido kanpakuki"
御堂関白日記 (Diary of Mido kanpaku) all 3843 days from year 998 -  1021
(full-text searchable database) becomes available at the International
Research Center of Japanese Studies.

http://www.nichibun.ac.jp/graphicversion/dbase/sekkanki.html

English explanation:
http://www.nichibun.ac.jp/graphicversion/dbase/sekkanki_e.html

Require registration for use. (free)