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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But to archaeologists, the Tollense Valley is considered Europe’s oldest battlefield.
An amateur archaeologist first spotted a bone sticking out of the riverbank in 1996.
A series of ongoing site excavations since 2008 has shown that the thousands of bones and hundreds of weapons preserved by the valley’s undisturbed environment were part of a large-scale battle 3,250 years ago.
The biggest mysteries that researchers aim to uncover are why the battle occurred and who fought in it. These are questions that they are now one step closer to answering.
ozens of bronze and flint arrowheads recovered from the Tollense Valley are revealing details about the able-bodied warriors who fought in the Bronze Age battle.
The research team analyzed and compared the arrowheads, some of which were still embedded in the remains of the fallen. While many of these weapons were locally produced, some bearing different shapes came from a region that now includes modern Bavaria and Moravia.
The outliers’ presence suggests that a southern army clashed with local tribes in the valley, and researchers suspect the conflict began at a key landmark along the river.
Back to the future
Scientists are harnessing the power of artificial intelligence to detect hidden archaeological sites buried below the sand of the sprawling Rub‘ al-Khali desert.
The desert spans 250,000 square miles (650,000 square kilometers) on the Arabian Peninsula, and its name translates to “the Empty Quarter” in English. To unravel the secrets of the desolate terrain, researchers are combining machine learning with a satellite imagery technique that uses radio waves to spot objects that may be concealed beneath surfaces.
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