Pogresno si skontao, short verzija datetime-a samo zauzima manje memorije i ima manji opseg datuma i manju rezoluciju za vreme, ali oba sadrze i datum i vreme. Timestamp je nesto sasvim deseto (a i timestamp je implementiran trenutno kao full datetime, ali je to podlezno promeni), ono sto ti pitas je razlika izmedu datetime i smalldatetime tipova u SQL-u.
datetime - Date and time data from January 1, 1753 through December 31, 9999, to an accuracy of one three-hundredth of a second (equivalent to 3.33 milliseconds or 0.00333 seconds) - 8 bytes
smalldatetime - Date and time data from January 1, 1900, through June 6, 2079, with accuracy to the minute.
Btw, u VB.NET-u Date property iz klase DateTime vraca samo datumsku komponentu (vreme je postavljeno na 12:00am)
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