Yes (but there are two sentences – not one.)
Rover
Teacher, is this sentence OK?
The dates of the entries on the ledger on page 1 are incorrect. The dates should be February 1, 2010, March 1, 2010 and April 1, 2010.
Yes (but there are two sentences – not one.)
Rover
Yes, it's OK, but I would use "in the ledger".
I would use semicolons to separate the dates, since there are already commas in the dates.
February 1, 2010; March 1, 2010; and April 1, 2010.