时间工具类、常用时间转换TimeUtils
public class TimeUtils {
private static String dateTimeFormt="yyyy-MM-dd HH:mm:ss";
private static String dateFormat="yyyy-MM-dd";
public static String currentDateTime(){
Date date=new Date();
SimpleDateFormat simpleFormatter=new SimpleDateFormat(dateTimeFormt);
return simpleFormatter.format(date);
}
public static String paraseDateTime(String str){
SimpleDateFormat simpleDateFormat=null;
if(str.contains(":")) {
simpleDateFormat= new SimpleDateFormat(dateTimeFormt);
}else{
simpleDateFormat=new SimpleDateFormat(dateFormat);
}
try {
Date date = simpleDateFormat.parse(str);
String time = simpleDateFormat.format(date);
return time;
} catch (ParseException e) {
e.printStackTrace();
return null;
}
}
public static Date getDateBystr(String str){
SimpleDateFormat simpleDateFormat=null;
if(str.contains(":")) {
simpleDateFormat= new SimpleDateFormat(dateTimeFormt);
}else{
simpleDateFormat=new SimpleDateFormat(dateFormat);
}
try {
Date date = simpleDateFormat.parse(str);
return date;
} catch (ParseException e) {
e.printStackTrace();
return null;
}
}
public static long currentTimestamp(){
return System.currentTimeMillis();
}
public static String timeStampleToTime(String timestamp){
SimpleDateFormat simpleDateFormat=new SimpleDateFormat(dateTimeFormt);
long time= Long.parseLong(timestamp);
Date date=new Date(time);
String dateTime = simpleDateFormat.format(date);
return dateTime;
}
public static String timeTotimestamp(String str){
SimpleDateFormat simpleDateFormat=new SimpleDateFormat(dateTimeFormt);
try {
Date date = simpleDateFormat.parse(str);
long time=date.getTime();
return String.valueOf(time);
} catch (ParseException e) {
e.printStackTrace();
return null;
}
}
public static String getWantDateTime(int num){
Calendar calendar=Calendar.getInstance();
calendar.add(Calendar.DATE,num);
Date date = calendar.getTime();
SimpleDateFormat simpleDateFormat=new SimpleDateFormat(dateTimeFormt);
String time = simpleDateFormat.format(date);
return time;
}
public static String getWhenDay(String str){
SimpleDateFormat simpleDateFormat=new SimpleDateFormat(dateTimeFormt);
try {
Date date = simpleDateFormat.parse(str);
Calendar cal = Calendar.getInstance();
cal.setTime(date);
int days = Days(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH) + 1, cal.get(Calendar.DATE));
return String.valueOf(days);
} catch (ParseException e) {
e.printStackTrace();
return null;
}
}
public static int Days(int year, int month, int day) {
int num = 0;
for (int i = 1; i < month; i++) {
switch (i) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
num += 31;
break;
case 2:
num += (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) ? 29 : 28;
break;
default:
num += 30;
break;
}
}
num += day;
return num;
}
@Test
public void test1(){
System.out.println(TimeUtils.currentDateTime());
System.out.println(TimeUtils.paraseDateTime("2020-10-12 20:51:34.0000"));
System.out.println(TimeUtils.getDateBystr("2020-10-12"));
long l = System.currentTimeMillis();
System.out.println(TimeUtils.paraseDateTime("1602507934738"));
System.out.println(TimeUtils.timeStampleToTime("1602507934738"));
System.out.println(TimeUtils.timeStampleToTime("1602507934000"));
System.out.println(TimeUtils.timeTotimestamp("2020-10-12 21:05:34"));
System.out.println(TimeUtils.getWhenDay("2020-01-01 21:44:08"));
System.out.println(TimeUtils.currentTimestamp());
}
}