[Edit]

Java - get milliseconds from date time in string

1 contributors

2 contributions

0 discussions

8 points

Created by:

Broncono

466

In java we can get milliseconds with following methods:

Edit

Date class - getTime() method
Instant class - toEpochMilli() method
Calendar class - getTimeInMillis() method

1. Get milliseconds with Date

Edit

xxxxxxxxxx
 
String dateTimeStr = "2019-08-10 02:39:00:123";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss:SSS");
Date date = sdf.parse(dateTimeStr);
​
System.out.println(date.getTime());

Output:

xxxxxxxxxx
 
1565397540123

2. Get milliseconds with Instant (Java 8)

Edit

xxxxxxxxxx
 
String dateTimeStr = "2019-08-10 02:39:00:123";
LocalDateTime localDateTime = LocalDateTime.parse(dateTimeStr,
        DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss:SSS"));
​
Instant instant = localDateTime.atZone(ZoneId.systemDefault()).toInstant();
​
System.out.println(instant.toEpochMilli()); // 1565397540123

Output:

xxxxxxxxxx
 
1565397540123

3. Get milliseconds with Calendar

Edit

xxxxxxxxxx
 
String dateTimeStr = "2019-08-10 02:39:00:123";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss:SSS");
Date date = sdf.parse(dateTimeStr);
​
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
​
System.out.println(calendar.getTimeInMillis()); // 1565397540123