find hour or minute difference between 2 java.sql.Timestamps?
I ended using this, just want to post it for others if they search for it.
public static long compareTwoTimeStamps(java.sql.Timestamp currentTime, java.sql.Timestamp oldTime)
{
long milliseconds1 = oldTime.getTime();
long milliseconds2 = currentTime.getTime();
long diff = milliseconds2 - milliseconds1;
long diffSeconds = diff / 1000;
long diffMinutes = diff / (60 * 1000);
long diffHours = diff / (60 * 60 * 1000);
long diffDays = diff / (24 * 60 * 60 * 1000);
return diffMinutes;
}