【HC】java时间对比
java时间对比，后续不断更新public static void main(String[] args) throws ParseException {
//timestamp===========================
//java获取取得Timestamp类型的当前系统时间
//方法1
Date date = new Date();
Timestamp t1 = new Timestamp(date.getTime());
//方法2
Timestamp t2 = new Timestamp(System.currentTimeMillis());
System.out.println(t1);
System.out.println(t2);
//java.sql.Date 只存储日期数据不存储时间数据
//日期相互转换======
Timestamp ts2 = Timestamp.valueOf("2017-10-28 12:45:54.646");//string->Timestamp
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date tsDate =formatter.parse(t2.toString());//Timestamp->Date
String tsString = formatter.format(t2);//Timestamp->String
//Timestamp比较
int compareTo = t2.compareTo(ts2);
//数据库操作================================================
//往数据库存储
Date utilDate = new Date();
Timestamp dbTimestamp = new Timestamp(utilDate.getTime());//保存到数据库
//从数据库里取数据
Date dbDate = new Date(dbTimestamp.getTime());
//Date比较=========
boolean equals = dbDate.equals(utilDate);
//java.util.Date类型比较===============================
Date date2 = new Date();
System.out.print("Date 1 = " + date1 + " and Date 2 = " +date2);
// Check if two instances of Date are the same
if (DateUtils.isSameDay(date1, date2)) {
System.out.println(" ->Dates match");
}
else
System.out.println(" ->Dates not match");
Calendar cal1 = Calendar.getInstance();
Calendar cal2 = Calendar.getInstance();
System.out.print("Calendar 1 = " + date1 + " and Calendar 2 = " +date2);
// Check if two instances of Calendar are the same
if (DateUtils.isSameDay(cal1, cal2)) {
System.out.println(" ->Calendars match");
}
else
http://cdn.u1.huluxia.com/g3/M01/4A/B3/wKgBOV3SvUmAR24wAAFAIevZ-vc675.jpghttp://cdn.u1.huluxia.com/g3/M01/4A/B3/wKgBOV3SvUmADI1yAACj4CpuLno753.jpg
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