摘要自：Java SimpleDateFormat
一、DateFormat 的语义释义G Era designator (before christ, after christ) y Year (e.g. 12 or 2012). Use either yy or yyyy. M Month in year. Number of M's determine length of format (e.g. MM, MMM or MMMMM) d Day in month. Number of d's determine length of format (e.g. d or dd) h Hour of day, 1-12 (AM / PM) (normally hh) H Hour of day, 0-23 (normally HH) m Minute in hour, 0-59 (normally mm) s Second in minute, 0-59 (normally ss) S Millisecond in second, 0-999 (normally SSS) E Day in week (e.g Monday, Tuesday etc.) D Day in year (1-366) F Day of week in month (e.g. 1st Thursday of December) w Week in year (1-53) W Week in month (0-5) a AM / PM marker k Hour in day (1-24, unlike HH's 0-23) K Hour in day, AM / PM (0-11) z Time Zone ' Escape for text delimiter ' Single quote二、常见DateFormat 类型
| Pattern | Example |
|---|---|
| dd-MM-yy | 31-01-12 |
| dd-MM-yyyy | 31-01-2012 |
| MM-dd-yyyy | 01-31-2012 |
| yyyy-MM-dd | 2012-01-31 |
| yyyy-MM-dd HH:mm:ss | 2012-01-31 23:59:59 |
| yyyy-MM-dd HH:mm:ss.SSS | 2012-01-31 23:59:59.999 |
| yyyy-MM-dd HH:mm:ss.SSSZ | 2012-01-31 23:59:59.999+0100 |
| EEEEE MMMMM yyyy HH:mm:ss.SSSZ | Saturday November 2012 10:45:42.720+0100 |
