正文
今天早上，发现了一个问题，就是使用SimpleDateFormat，我使用的pattern是yyyy-MM-dd hh:mm:ss，但是到了晚上，发现是12小时制的。啊！！！！
在网上查找了一下，做了下一归纳：
官方文档：https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html
| Letter | Date or Time Component | Presentation | Examples |
G |
Era designator | Text | AD |
y |
Year | Year | 1996; 96 |
Y |
Week year | Year | 2009; 09 |
M |
Month in year | Month | July; Jul; 07 |
w |
Week in year | Number | 27 |
W |
Week in month | Number | 2 |
D |
Day in year | Number | 189 |
d |
Day in month | Number | 10 |
F |
Day of week in month | Number | 2 |
E |
Day name in week | Text | Tuesday; Tue |
u |
Day number of week (1 = Monday, ..., 7 = Sunday) | Number | 1 |
a |
Am/pm marker | Text | PM |
H |
Hour in day (0-23) | Number | 0 |
k |
Hour in day (1-24) | Number | 24 |
K |
Hour in am/pm (0-11) | Number | 0 |
h |
Hour in am/pm (1-12) | Number | 12 |
m |
Minute in hour | Number | 30 |
s |
Second in minute | Number | 55 |
S |
Millisecond | Number | 978 |
z |
Time zone | General time zone | Pacific Standard Time; PST; GMT-08:00 |
Z |
Time zone | RFC 822 time zone | -0800 |
X |
Time zone | ISO 8601 time zone | -08; -0800; -08:00 |
上面是可以用的字母。
其实也可以用这个pattern：yyyy-mm-dd hh24:mm:ss
加油！！！
