MIDP的Date和Calendar类都是J2SE的精简版，也没有SimpleDateFormat之类的格式化类，因此，写了一个简单的DateTime类实现本地日期和时间的格式化。
package com.crackj2ee.midp.util;
import Java.util.*;
public final class DateTime {
private static String[] WEEKDAYS = {"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};
public final String timeZone;
public final int year;
public final int month;
public final int day;
public final int weekday;
public final int hour;
public final int minute;
public final int second;
public DateTime(Date date, String timeZone) {
this.timeZone = timeZone;
Calendar c = timeZone==null ? Calendar.getInstance() : Calendar.getInstance(TimeZone.getTimeZone(timeZone));
c.setTime(date);
year = c.get(Calendar.YEAR);
month = c.get(Calendar.MONTH);
day = c.get(Calendar.DAY_OF_MONTH);
weekday = c.get(Calendar.DAY_OF_WEEK);
hour = c.get(Calendar.HOUR_OF_DAY);
minute = c.get(Calendar.MINUTE);
second = c.get(Calendar.SECOND);
}
public DateTime(long time, String timeZone) {
this(new Date(time), timeZone);
}
public Date toDate() {
Calendar c = Calendar.getInstance(TimeZone.getTimeZone(timeZone));
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, month);
c.set(Calendar.DAY_OF_MONTH, day);
c.set(Calendar.HOUR_OF_DAY, hour);
c.set(Calendar.MINUTE, minute);
c.set(Calendar.SECOND, second);
return c.getTime();
}
public String toDateString() {
return year + "-" + (month+1) + "-" + day + "(" + WEEKDAYS[weekday-1] + ")";
}
public String toTimeString() {
return hour + ":" + minute + ":" + second;
}
public String toString() {
return toDateString() + " " + toTimeString();
}
}
示例：
输出当前日期和时间：new DateTime(new Date(), "GMT+8").toString();
转换到Date对象：toDate();
注意，要指定时区，否则时间永远是GMT标准时间。可以在Windows时区设置中查询，北京时间是"GMT+8"
（出处：http://www.knowsky.com）
