There are 3 cards in James Hanley’s Compiled Service Record file for the 13th Regiment Louisiana Infantry, they record his enlistment date as:

Mar 1862

Mch. 10, 1862

May 11, 1862

M320: Compiled Service Records of Confederate Soldiers Who Served in Organizations from the State of Louisiana

It's not that unusual that we see differing dates of enlistment for those men who transferred from one unit to another. In many cases the latter unit records show the enlistment date for the first. Confusing!!