其中Calendar提供各个时间单位的操作,如cal.add(Calendar.year,-2),即可获得前年的今天的日期
SQL语句:删除一定范围的时间1 delete from mealorder WHERE (time >= ‘2015-05-24 00:00:00‘ and time <= ‘2015-05-24 23:59:59‘);其中‘time‘字段类型为datetime
【MySQL】Java对SQL时间类型的操作(获得当前、昨天、前年。。时间)
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Date date = new Date();DateFormat df1 = DateFormat.getDateInstance();//日期格式,精确到日System.out.println(df1.format(date));DateFormat df2 = DateFormat.getDateTimeInstance();//可以精确到时分秒System.out.println(df2.format(date));DateFormat df3 = DateFormat.getTimeInstance();//只显示出时分秒System.out.println(df3.format(date));DateFormat df4 = DateFormat.getDateTimeInstance(DateFormat.FULL,DateFormat.FULL); System.out.println(df4.format(date)); DateFormat df5 = DateFormat.getDateTimeInstance(DateFormat.LONG,DateFormat.LONG); System.out.println(df5.format(date));DateFormat df6 = DateFormat.getDateTimeInstance(DateFormat.SHORT,DateFormat.SHORT); System.out.println(df6.format(date)); DateFormat df7 = DateFormat.getDateTimeInstance(DateFormat.MEDIUM,DateFormat.MEDIUM); System.out.println(df7.format(date));
java.sql.Date now= new java.sql.Date(System.currentTimeMillis());
java.util.Date datetime=new java.util.Date(); java.sql.Timestamp time=new java.sql.Timestamp(datetime.getTime());