Eykt is a time measurement. In the old days, the day in Iceland was split up to eight eyktir and did each and every one of them count around three hours. 8 eyktir = 24 hours.
Eyktamark is when one eykt ends and the next one begins, and the names of them are: lágnætti, ótta, rismál, dagmál, hádegi, nón, miðaftann and náttmál.
Eyktamark represents the three hours that are inside every eykt. Because of that people spoke of early dagmál (which would best be described as early in the three hours dagmál counts, closer to nine than twelve) and late in hádegi (which would then be closer to three then twelve).
Eyktir is a clock that is supposed to work as a return to simpler times and represents a more open time than we are used to. Eyktir is for those that crave to escape the stress of modern society and instead of always being nervous because the time tells you that now you should get to a meeting or now you should wake up, you can relax. You are supposed to arrive in a meeting during hádegi, so you arrive inside of that eykt (three hours) which the eyktamark hádegi (from 12:00-14:59) is in and although you ought to wake up in rismál, you don’t have to get up at six o’clock, but instead you can get up late in rismál, or just right before nine.