getLocaleDateFormatlink

说明link

There are four basic date formats:

• full should contain long-weekday (EEEE), year (y), long-month (MMMM), day (d).

  For example, English uses EEEE, MMMM d, y, corresponding to a date like "Tuesday, September 14, 1999".

• long should contain year, long-month, day.

  For example, MMMM d, y, corresponding to a date like "September 14, 1999".

• medium should contain year, abbreviated-month (MMM), day.

  For example, MMM d, y, corresponding to a date like "Sep 14, 1999". For languages that do not use abbreviated months, use the numeric month (MM/M). For example, y/MM/dd, corresponding to a date like "1999/09/14".

• short should contain year, numeric-month (MM/M), and day.

  For example, M/d/yy, corresponding to a date like "9/14/99".