いっさくさくじつ【一昨昨日】
three days ago
いっさくさくねん【一昨昨年】
three years ago
いっさくじつ【一昨日】
the day before yesterday一昨日の午後the afternoon of the day before yesterday(▼普通は ((on)) Friday aftern...
いっさくねん【一昨年】
the year before last; two years ago一昨年の冬the winter before last
いっさくばん【一昨晩】
the evening [night] before last; two nights ago