It is important to note that various dive computer brands will have small differences due to slightly different calculations in the computer. These calculations are called the decompression algorithm. Also, remember that after your first dive of the day, the times will be significantly reduced. This is because the computer is calculating and considering your accrued nitrogen from the first dive.
Below are examples from an air dive computer that has not dived for 24 hours and is showing the dive planning pages in metric and imperial. (Note small differences as depths do not exactly equate.) These are the NDLs according to this computer. If we had already dived on this computer today, it would calculate new reduced NDLs.