Partly cited in: Jean-Marc Choukroun, Roberta Snow (1992) Planning for human systems: essays in honor of Russell L. Ackoff. p. 287. 
1950s, The development of operations research as a science, 1956
                                    
“Some philosophers have believed that a philosophical clarification of space also provided a solution of the problem of time. Kant presented space and time as analogous forms of visualization and treated them in a common chapter in his major epistemological work. Time therefore seems to be much less problematic since it has none of the difficulties resulting from multidimensionality. Time does not have the problem of mirror-image congruence, i. e., the problem of equal and similarly shaped figures that cannot be superimposed, a problem that has played some role in Kant's philosophy. Furthermore, time has no problem analogous to non-Euclidean geometry. In a one-dimensional schema it is impossible to distinguish between straightness and curvature. …A line may have external curvature but never an internal one, since this possibility exists only for a two-dimensional or higher continuum. Thus time lacks, because of its one-dimensionality, all those problems which have led to philosophical analysis of the problems of space.”
The Philosophy of Space and Time (1928, tr. 1957)
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Hans Reichenbach 41
American philosopher 1891–1953Related quotes
“Time is never a problem on the God level. Or space.”
                                        
                                        Job: A Comedy of Justice (1984) 
Context: Time is never a problem on the God level. Or space. Whatever needed to deceive you was provided. But no more than that. That is the conservative principle in art at the God level. While I can't do it, not being at that level, I have seen a lot of it done. A skillful Artist in shapes and appearances does no more than necessary to create His effect.
                                    
“I believe it will take time to find a solution to the problem. Thus we must have patience.”
                                        
                                        On the Bosnian War, as quoted in Welcome to Sarajevo (1997) 
1990s
                                    
As quoted by Donald Rumsfeld in "Sharon's Victory" (link is to a preview, but the quote is in the first few visible lines) https://www.wsj.com/articles/SB981508176687515426, Wall Street Journal (7 February 2001)
                                        
                                        p, 125 
Geometrical Lectures (1735)
                                    
                                        
                                        In Carl Seelig's Albert Einstein: A Documentary Biography (1956), Seelig reports that Einstein said this to James Franck,  p. 71 http://books.google.com/books?id=VCbPAAAAMAAJ&q=%22how+it+happened%22#search_anchor. 
I sometimes ask myself how did it come that I was the one to develop the theory of relativity. The reason, I think, is that a normal adult never stops to think about problems of space and time. But my intellectual development was retarded, as a result of which I began to wonder about space and time only when I had already grown up. Naturally, I could go deeper into the problem than a child with normal abilities. 
Variant translation which appears in Einstein: The Life and Times by Ronald W. Clark (1971),  p. 27 http://books.google.com/books?id=6IKVA0lY6MAC&lpg=PP1&pg=PA27#v=onepage&q&f=false 
Attributed in posthumous publications
                                    
                                
                                    “There are problems in these times, but none of them are mine
I'm beginning to see the light”
                                
                                
                                
                                
                            
                                        
                                        "Beginning to See the Light" 
Lyrics