Java 各種時間上的操作範例
分享一些在專案中用到JAVA與日期相關的操作，包括：
- 取得目前的年、月、日
- 判斷兩個日期的大小
- 計算兩個日期的差距
- 取得昨天的日期
- 取得上個月的開始與結束日
package CDIT.stanley;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Calendar;
public class dateOperation {
public static int differentDays(Date date1,Date date2){
Calendar cal1 = Calendar.getInstance();
cal1.setTime(date1);
Calendar cal2 = Calendar.getInstance();
cal2.setTime(date2);
int day1= cal1.get(Calendar.DAY_OF_YEAR);
int day2 = cal2.get(Calendar.DAY_OF_YEAR);
int year1 = cal1.get(Calendar.YEAR);
int year2 = cal2.get(Calendar.YEAR);
if(year1 != year2){
int timeDistance = 0 ;
for(int i = year1 ; i < year2 ; i ++){
if(i%4==0 && i%100!=0 || i%400==0){
timeDistance += 366;
}
else{
timeDistance += 365;
}
}
return timeDistance + (day2-day1) ;
}
else{
return day2-day1;
}
}
public static Date getFirstMonthDay(Calendar calendar) {
calendar.set(Calendar.DATE, calendar.getActualMinimum(Calendar.DATE));
return calendar.getTime();
}
public static Date getLastMonthDay(Calendar calendar) {
calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DATE));
return calendar.getTime();
}
public static void main(String[] args) throws ParseException {
//取得目前的年、月、日
Calendar calendar = Calendar.getInstance();
System.out.println("今天是" + calendar.get(Calendar.YEAR) + "年" + (calendar.get(Calendar.MONTH) + 1) + "月" + calendar.get(Calendar.DAY_OF_MONTH) + "日");
System.out.println("==================================================");
//輸出：今天是2017年8月24日
//判斷兩個日期的大小
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd", Locale.TAIWAN);
Date date1 = sdf.parse("2017-08-23");
Date date2 = sdf.parse("2016-09-22");
System.out.println("Date1 < Date2 : " + date1.before(date2));
System.out.println("Date1 > Date2 : " + date1.after(date2));
System.out.println("==================================================");
//輸出：Date1 < Date2 : false、Date1 > Date2 : true
//計算兩個日期的差距
System.out.println("Date1 & Date2 差距 : " + differentDays(date1 , date2) + "天");
System.out.println("==================================================");
//輸出：Date1 & Date2 差距 : 31天
//取得昨天的日期
calendar = Calendar.getInstance();
calendar.add(Calendar.DATE, -1);
String yestedayDate = sdf.format(calendar.getTime());
System.out.println("昨天是" + yestedayDate);
System.out.println("==================================================");
//輸出：昨天是2017-08-23
//取得上個月的開始與結束日
calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH,-1);
String monthDayFirst = sdf.format(getFirstMonthDay(calendar));
String monthDayLast = sdf.format(getLastMonthDay(calendar));
System.out.println("上個月的第一天是" + monthDayFirst);
System.out.println("上個月的最後一天是" + monthDayLast);
System.out.println("==================================================");
//輸出：上個月的第一天是2017-07-01、上個月的最後一天是2017-07-31
}
}
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