一个比较全的日期操作例子Calendar

import Java.text.DateFormat;
import java.util.*;

public class JSPCalendar {
Calendar calendar = null;

public JspCalendar() {
calendar = Calendar.getInstance();
Date trialTime = new Date();
calendar.setTime(trialTime);
}

public int getYear() {
return calendar.get(Calendar.YEAR);
}

public String getMonth() {
int m = getMonthInt();
String[] months = new String [] { "January", "February", "March",
"April", "May", "June",
"July", "August", "September",
"October", "November", "December" };
if (m > 12)
return "Unknown to Man";

return months[m - 1];

}

public String getDay() {
int x = getDayOfWeek();
String[] days = new String[] {"Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday"};

if (x > 7)
return "Unknown to Man";

return days[x - 1];

}

public int getMonthInt() {
return 1 calendar.get(Calendar.MONTH);
}

public String getDate() {
return getMonthInt() "/" getDayOfMonth() "/" getYear();

}

public String getTime() {
return getHour() ":" getMinute() ":" getSecond();
}

public int getDayOfMonth() {
return calendar.get(Calendar.DAY_OF_MONTH);
}

public int getDayOfYear() {
return calendar.get(Calendar.DAY_OF_YEAR);
}

public int getWeekOfYear() {
return calendar.get(Calendar.WEEK_OF_YEAR);
}

public int getWeekOfMonth() {
return calendar.get(Calendar.WEEK_OF_MONTH);
}

public int getDayOfWeek() {
return calendar.get(Calendar.DAY_OF_WEEK);
}

public int getHour() {
return calendar.get(Calendar.HOUR_OF_DAY);
}

public int getMinute() {
return calendar.get(Calendar.MINUTE);
}

public int getSecond() {
return calendar.get(Calendar.SECOND);
}

public static void main(String args[]) {
JspCalendar db = new JspCalendar();
p("date: " db.getDayOfMonth());
p("year: " db.getYear());
p("month: " db.getMonth());
p("time: " db.getTime());
p("date: " db.getDate());
p("Day: " db.getDay());
p("DayOfYear: " db.getDayOfYear());
p("WeekOfYear: " db.getWeekOfYear());
p("era: " db.getEra());
p("ampm: " db.getAMPM());
p("DST: " db.getDSTOffset());
p("ZONE Offset: " db.getZoneOffset());
p("TIMEZONE: " db.getUSTimeZone());
}

private static void p(String x) {
System.out.println(x);
}

public int getEra() {
return calendar.get(Calendar.ERA);
}

public String getUSTimeZone() {
String[] zones = new String[] {"Hawaii", "Alaskan", "Pacific",
"Mountain", "Central", "Eastern"};

return zones[10 getZoneOffset()];
}

public int getZoneOffset() {
return calendar.get(Calendar.ZONE_OFFSET)/(60*60*1000);
}

public int getDSTOffset() {
return calendar.get(Calendar.DST_OFFSET)/(60*60*1000);
}

public int getAMPM() {
return calendar.get(Calendar.AM_PM);
}
}

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