score:2

You can use tickPositions like in the example: http://jsfiddle.net/z5P8d/

 tickPositions:  [Date.UTC(1970,9, 27),Date.UTC(1970,  9, 26),Date.UTC(1970, 11,  1),Date.UTC(1970, 11, 11),Date.UTC(1970, 11, 25), Date.UTC(1971,  0,  8),Date.UTC(1971,  0, 15), Date.UTC(1971,  1,  1),Date.UTC(1971,  1,  8), Date.UTC(1971,  1, 21),Date.UTC(1971,  2, 12), Date.UTC(1971,  2, 25),Date.UTC(1971,  3,  4), Date.UTC(1971,  3,  9),Date.UTC(1971,  3, 13), Date.UTC(1971,  3, 19), Date.UTC(1971,  4, 25),Date.UTC(1971,  4, 31), Date.UTC(1971,  5,  7)  ],

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