The Hebrews reckoned two evenings of each day, as appears from Ex. 16:12: 30:8; 12:6 (marg.); Lev. 23:5 (marg. R.V., between the two evenings). The first evening was that period when the sun was verging towards setting, and the second evening the moment of actual sunset.
BCE/CE usually refers to the Common Era (the years are the same as AD/BC). That is, BC is usually understood to mean Before the Common Era and CE to mean Common Era, though it is possible to reinterpret the abbreviations as Christian Era..
Proponents of the Common Era notation assert that the use of BCE/CE shows sensitivity to those who use the same year numbering system as the one that originated with and is currently used by Christians, but who are not themselves Christian.