Both end and ending refer to a termination or close of something, a conclusion, the final part of an action or happening. Thus one may refer to the end or the ending of a war, a book, a play, or a love affair. End, however, is more often applied to the actual completion of an action, whereas ending refers to the process of completing or winding it up. That is, the end of a novel is the final line of the narrative; the ending of a novel can have the same meaning but may also apply to the final pages, the last full episode. The end of a war refers to that moment when hostilities cease; the ending of a war may equally apply to a longer period during which a war is winding down while negotiations for a cease-fire or armistice are in progress. That is, what is ending is "coming" to an end or is "about" to end. What is ended has actually come to an end at some time in the past."He never left town during the six months ended last June." "He hopes to make several trips during the period ending next December."
Although the practice is widespread, avoid the use of ending to refer to any period of time other than one to be completed in the future. Also, remember that end itself is an overworked word, appearing in numerous trite, wordy, or illogical expressions. End is informal when used to mean "duty," "obligation," or "part" (your end of the bargain). It appears often in such trite expressions as "go off the deep end" ("behave recklessly or impulsively"); "make both ends meet" ("manage to live within one's means"); "no end" ("a great deal"); "hold one's end up" ("care for one's own responsibility"); "at loose ends" ("unsettled"); "at one's wit's end" ("at the end of one's resources"); "put an end to" ("finish," "terminate"); "ends of the earth" ("remote regions," "everywhere")."End result" is a wordy phrase; result conveys the idea of end. Since a result is an end, avoid this trite, redundant expression.
Dictionary of problem words and expressions. Harry Shaw. 1975.