1 Day: 1 day is 24 hours. The amount of time required for one full rotation of the Earth from the perspective of the Sun. More specifically this unit is known as a solar day. 1 Solar day = 86 400 seconds (SI base unit). 1 d = 86400 s.

1 Millisecond: A millisecond is exactly 1 x 10-3 seconds. 1 ms = 0.001 s.