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853天前import java.text.ParseException; |
import java.text.ParsePosition; |
import java.text.SimpleDateFormat; |
import java.util.Calendar; |
import java.util.Date; |
import java.util.Locale; |
public class DateTest { |
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public static void main(String[] args) { |
Date d = new Date(); |
Date nd = new Date(d.getTime()-1000*60*60*24); |
System.out.println(d); |
System.out.println(nd); |
System.out.println(d.before(nd)); |
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Date end = new Date(); |
System.out.println(end.getTime()-d.getTime()); |
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} |
} |
DateFormat: |
import java.text.ParseException; |
import java.text.SimpleDateFormat; |
import java.util.Date; |
import java.util.Locale; |
import java.util.SimpleTimeZone; |
import java.util.TimeZone; |
public class DateFormatTest { |
public static void main(String[] args)throws ParseException { |
Date d = new Date(); |
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SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss") ;//可以有语言Locale.ENGLISH |
System.out.println(format.format(d)); |
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format.applyPattern("EEE MM,dd,yyyy HH:mm:ss "); |
System.out.println(format.format(d)); |
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format.applyPattern("MM,dd,yy HH:mm:ss"); |
System.out.println(format.format(d)); |
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Date d2 = format.parse("10,31,16 19:18:56"); |
System.out.println(d2); |
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SimpleDateFormat format2 = new SimpleDateFormat("EEE MM,dd,yyyy HH:mm:ss ", Locale.ENGLISH); |
System.out.println(format2.format(d)); |
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import java.util.Calendar; |
public class CalendarTest { |
public static void main (String[] args){ |
Calendar c = Calendar.getInstance(); |
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c.set(2016, 7, 5, 22, 12, 1); |
System.out.println(c.getTime()); |
System.out.println(c.get(Calendar.DAY_OF_WEEK)); |
System.out.println(Calendar.MONDAY); |
System.out.println(c.get(Calendar.DAY_OF_YEAR)); |
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c.set(Calendar.MONTH, 8); |
c.set(Calendar.DAY_OF_MONTH, 31); |
System.out.println("after set date : " + c.getTime()); |
for (int i=0;i<50;i++) { |
c.roll(Calendar.DAY_OF_MONTH, true); |
} |
System.out.println("after roll : " + c.getTime()); |
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for (int i=0;i<50;i++) { |
c.add(Calendar.DAY_OF_MONTH, 1); |
} |
System.out.println("after add 1 : " + c.getTime()); |
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for (int i=0;i<50;i++) { |
c.add(Calendar.DAY_OF_MONTH, -1); |
} |
System.out.println("after add -1 : " + c.getTime()); |
} |
