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Java Calendar擷取年、月、日、時間
Calendar c = Calendar.getInstance(TimeZone.getTimeZone("GMT+08:00")); //擷取東八區時間
int year = c.get(Calendar.YEAR); //擷取年
int month = c.get(Calendar.MONTH) + 1; //擷取月份,0表示1月份
int day = c.get(Calendar.DAY_OF_MONTH); //擷取目前天數
int first = c.getActualMinimum(c.DAY_OF_MONTH); //擷取本月最小天數
int last = c.getActualMaximum(c.DAY_OF_MONTH); //擷取本月最大天數
int time = c.get(Calendar.HOUR_OF_DAY); //擷取目前小時
int min = c.get(Calendar.MINUTE); //擷取目前分鐘
int xx = c.get(Calendar.SECOND); //擷取目前秒
SimpleDateFormat s=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String curDate = s.format(c.getTime()); //目前日期
System.out.println("目前時間:"+year + "-" + month + "-"+ day + " "+time + ":" + min +":" + xx);
System.out.println("第一天和最後天:" + first +"," + last);
System.out.println("目前日期curDate====:" + curDate);
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輸出結果:
目前時間:2012-9-25 22:50:54
第一天和最後天:1,30
目前日期curDate:2012-09-25 22:50:54
Calendar的計算
c.add(Calendar.YEAR, 1);
c.add(Calendar.MONTH, 1);
c.add(Calendar.DAY_OF_MONTH, 1);
int year2 = c.get(Calendar.YEAR);
int month2 = c.get(Calendar.MONTH) + 1;
int day2 = c.get(Calendar.DAY_OF_MONTH);
int firstD = c.getActualMinimum(c.DAY_OF_MONTH);
int lastD = c.getActualMaximum(c.DAY_OF_MONTH);
System.out.println("目前時間:"+year2 + "-" + month2 + "-"+ day2 + " "+time + ":" + min +":" + xx);
System.out.println("第一天和最後天:" + firstD +"," + lastD);
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輸出結果:
目前時間:2013-10-26 23:4:3
第一天和最後天:1,31
擷取上個月的年、月、日
Calendar c=Calendar.getInstance();
c.add(Calendar.MONTH, -1);//上個月
SimpleDateFormat s=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String year=String.valueOf(c.get(Calendar.YEAR));
String topDay = String.valueOf(c.getActualMinimum(Calendar.DAY_OF_MONTH));
String lastDay = String.valueOf(c.getActualMaximum(Calendar.DAY_OF_MONTH));
//上個月
String lastMonth=String.valueOf(c.get(Calendar.MONTH)+1).length()==2?String.valueOf(c.get(Calendar.MONTH)+1):"0"+String.valueOf(c.get(Calendar.MONTH)+1);
String topDayMonth=year+"-"+lastMonth+"-"+"01" + " 00:00:00";
String lastDayMonth = year+"-"+lastMonth+"-"+lastDay+ " 23:59:59";
System.out.println("###year:" + year);
System.out.println("###last month:" + lastMonth);
System.out.println("###topday:" + topDayMonth);
System.out.println("###lastday:" + lastDayMonth);
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輸出結果
###year:2013
###last month:04
###topday:2013-04-01 00:00:00
###lastday:2013-04-30 23:59:59
設定年月日
Calendar c = Calendar.getInstance(); // 目前時間的月曆對象。
// 設定年,月,日
c.set(2021, 6, 3);
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釋出者:全棧程式員棧長,轉載請注明出處:https://javaforall.cn/144815.html原文連結:https://javaforall.cn