The Theological Wordbook of the Old Testament (1980, Moody Press) "It can denote: 1. the period of light (as contrasted with the period of darkness), 2. the period of twenty-four hours, 3. a general vague "time," 4. a point of time, 5. a year (in the plural; I Sam 27:7; Ex 13:10, etc.)."
Strong's Exhaustive Concordance of the Bible (symbols omitted)from an unused root meaning to be hot; a day (as the warm hours), whether literal (from sunrise to sunset, or from one sunset to the next), or figuratively (a space of time defined by an associated term), [often used adv.]:--age, + always, + chronicles, continually (-ance), daily, ([birth-], each, to) day, (now a, two) days (agone), + elder, end, evening, (for)ever(lasting), ever(more), full, life, as long as (...live), even now, old, outlived, perpetually, presently, remaineth, required, season, since, space, then, (process of) time, as at other times, in trouble, weather (as) when, (a, the, within a) while (that), whole (age), (full) year (-ly), younger
As you can see, Hebrew dictionaries attest to the fact that the word Yom is used for anywhere from 12 hours up to a year, and even a vague "time period" of unspecified length. cont....@.... -www.answersincreation.org