From Wiktionary, the free dictionary
Borrowed from Spanish diana, from Spanish día (“day”), from Latin diēs (“day”), ultimately from Proto-Indo-European *dyew- (“heaven, sky; to shine”).
dayana
- (rare) a reveille; the sounding of a bugle or drum early in the morning to awaken soldiers
- (rare) the playing of a marching band early in the morning to signal the start of a fiesta or festival