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如何用Java获得过去或未来的日期?
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如何用Java获得过去或未来的日期?
使用日历对象使用 add() 方法转到未来日期或过去日期:
import java.util.Calendar; public class CalendarAddExample1 { public static void main(String[] args) { // current calendar date Calendar calendar = Calendar.getInstance(); System.out.println("Current time - " + calendar.getTime()); // Adding 10 days to get the future date calendar.add(Calendar.DATE, 10); System.out.println("10 days future time - " + calendar.getTime()); // 10 days old date to get the past date calendar.add(Calendar.DATE, -10); System.out.println("10 days past time - " + calendar.getTime()); // future 10 years calendar.add(Calendar.YEAR, 10); System.out.println("10 years future time - " + calendar.getTime()); // past 10 years calendar.add(Calendar.YEAR, -10); System.out.println("10 years back time - " + calendar.getTime()); // future 10 months calendar.add(Calendar.MONTH, 10); System.out.println("10 months future time - " + calendar.getTime()); // past 10 months calendar.add(Calendar.MONTH, -10); System.out.println("10 months back time - " + calendar.getTime()); } } |
使用 Calendar.HOUR 和 Calendar.MINUTE :
import java.util.Calendar; public class CalendarAddExample2 { public static void main(String[] args) { // current calendar date Calendar calendar = Calendar.getInstance(); System.out.println("Current time - " + calendar.getTime()); calendar.add(Calendar.HOUR, 1); System.out.println("adding one hour" + calendar.getTime()); calendar.add(Calendar.HOUR, -1); System.out.println("one hour back time - " + calendar.getTime()); // future 10 minutes calendar.add(Calendar.MINUTE, 10); System.out.println("10 minutes future time - " + calendar.getTime()); // past 10 minutes calendar.add(Calendar.MINUTE, -10); System.out.println("10 minutes back time - " + calendar.getTime()); } } |
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