plotting - How to rotate TickMarks in DateListPlot?

Is there a way to rotate TickMarks in DateListPlot to avoid overlap, eg:

enter image description here

Part of the code used to generate this is:

TimelineGr[file_] := 
 DateListPlot[{{First[#], 1}, {Last[#], Length@#}} &@
   Sort@Flatten[ Last /@ I2B2[file, dateIntervals], 1], 
  Epilog -> ({Text[First@#, {First@Last@#, First@#2}, {1, 0}], Blue, 

       Rectangle[{First@Last@#, First@#2}, {Last@Last@#, 
         First@#2 + 0.1}]} &~MapIndexed ~ I2B2[file, dateIntervals]),
  PlotRange -> All, AspectRatio -> 1/4, ImageSize -> 800, 
  DateTicksFormat -> {"Year", "/", "Month", "/", "Day"}, 
  FrameTicks -> {{Automatic, Automatic}, { 
     First[Last[#]] & /@ I2B2[file, dateIntervals], Automatic}}, 
  PlotLabel -> file <> ".xml"
  ]

(Note, this includes custom functions)

If not, this is just another example of why it's almost always better to write visualization from the bottom-up

Answer

Perhaps something like this?

data = {{{2006, 10, 1}, 10}, {{2006, 10, 15}, 12},
        {{2006, 10, 30}, 15}, {{2006, 11, 20}, 20}};

p = DateListPlot[data];

Show[p,
  Options[p, FrameTicks] /. s_String :> Rotate[s, 90 Degree]

]

Mathematica graphics

If one prefers not to use Show then:

p /. x : (FrameTicks -> _) :> (x /. s_String :> Rotate[s, 90 Degree])

Comments

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