Java 版 (精华区)

import java.util.Date;
import java.text.*;

String s=new SimpleDateFormat("yyyyMMdd").format(new Date());


同理可以这样用：

    SimpleDateFormat formatter=new SimpleDateFormat("yyyy-MM-dd");
    String time=formatter.format(new Date());

说明：
Letter  Date or Time Component  Presentation        Examples
-----------------------------------------------------------------------
G       designator              Text                AD
y       Year                    Year                1996; 96
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 in week             Text                Tuesday; Tue
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