SimpleDateFormat格式

  * <blockquote>
 * <table border=0 cellspacing=3 cellpadding=0 summary="Examples of date and time patterns interpreted in the U.S. locale">
 *     <tr bgcolor="#ccccff">
 *         <th align=left>Date and Time Pattern
 *         <th align=left>Result
 *     <tr>
 *         <td><code>"yyyy.MM.dd G 'at' HH:mm:ss z"</code>
 *         <td><code>2001.07.04 AD at 12:08:56 PDT</code>
 *     <tr bgcolor="#eeeeff">
 *         <td><code>"EEE, MMM d, ''yy"</code>
 *         <td><code>Wed, Jul 4, '01</code>
 *     <tr>
 *         <td><code>"h:mm a"</code>
 *         <td><code>12:08 PM</code>
 *     <tr bgcolor="#eeeeff">
 *         <td><code>"hh 'o''clock' a, zzzz"</code>
 *         <td><code>12 o'clock PM, Pacific Daylight Time</code>
 *     <tr>
 *         <td><code>"K:mm a, z"</code>
 *         <td><code>0:08 PM, PDT</code>
 *     <tr bgcolor="#eeeeff">
 *         <td><code>"yyyyy.MMMMM.dd GGG hh:mm aaa"</code>
 *         <td><code>02001.July.04 AD 12:08 PM</code>
 *     <tr>
 *         <td><code>"EEE, d MMM yyyy HH:mm:ss Z"</code>
 *         <td><code>Wed, 4 Jul 2001 12:08:56 -0700</code>
 *     <tr bgcolor="#eeeeff">
 *         <td><code>"yyMMddHHmmssZ"</code>
 *         <td><code>010704120856-0700</code>
 *     <tr>
 *         <td><code>"yyyy-MM-dd'T'HH:mm:ss.SSSZ"</code>
 *         <td><code>2001-07-04T12:08:56.235-0700</code>
 * </table>
 * </blockquote>