Have date and time on the tweets. That way if enough time have passed, its easier to keep track where you are on the timeline.
Have the time and date. At least the date showing up if it crosses to another day. That way if im behind on tweets and the last one i read was at 4pm on tuesday and its now 3pm on wednesday, i dont just see a date for tuesday, i would be able to see the time and date of the tweet