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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