Android 日期显示格式 Date Format

参考： http://null-point.iteye.com/blog/1591896

        用aChartEngine画TimeChart的时，横坐标的日期显示格式很多样。下面这些例子加上一些变通基本上涵盖了所有的格式：

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• For the month of September:
• M -> 9
• MM -> 09
• MMM -> Sep
• MMMM -> September

• For 7 minutes past the hour:
• m -> 7
• mm -> 07
• mmm -> 007
• mmmm -> 0007

• Examples for April 6, 1970 at 3:23am:
• "MM/dd/yy h:mmaa" -> "04/06/70 3:23am"
• "MMM dd, yyyy h:mmaa" -> "Apr 6, 1970 3:23am"
• "MMMM dd, yyyy h:mmaa" -> "April 6, 1970 3:23am"
• "E, MMMM dd, yyyy h:mmaa" -> "Mon, April 6, 19703:23am&
• "EEEE, MMMM dd, yyyy h:mmaa" -> "Monday, April 6, 1970 3:23am"
• "'Noteworthy day: 'M/d/yy" -> "Noteworthy day: 4/6/70"

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