After you file

I have a question I my taxes for accepted om the 28th of jan. Week after maybe little longer went to the 1541 code still processing blah blah I'm under the review but my quiestion is up by the cycle number three is a processing date 3/4 what is that date I have the 570 code it dates 3/4 also buuuut the 971 code which I also have dates 3/11 if anybody could explain these dates to me I would be grateful and thank u.