Android convert date and time to milliseconds

Question

I have one date and time format as below:

Tue Apr 23 16:08:28 GMT+05:30 2013

I want to convert into milliseconds, but I actually dont know

Answer 1

You can use this code

long miliSecsDate = milliseconds ("2015-06-04");
Log.d("miliSecsDate", " = "+miliSecsDate);

    public long milliseconds(String date) 
    {
        //String date_ = date;
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        try
        {
            Date mDate = sdf.parse(date);
            long timeInMilliseconds = mDate.getTime();
            System.out.println("Date in milli :: " + timeInMilliseconds);
            return timeInMilliseconds;
        }
        catch (ParseException e) 
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return 0;
    }

Answer 2

Android 26 and higher

Conversation from epoch to UTC date time and Device date time

public class TimeConversionUtil {

public static long getCurrentEpochUTC() {
    return Instant.now(Clock.systemUTC()).toEpochMilli();
}

public static String deviceDateTimeString(long epochMilliUtc) {
    Instant instant = Instant.ofEpochMilli(epochMilliUtc);
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MMM dd, yyyy, hh:mm:ss a", Locale.US).withZone(ZoneId.systemDefault());
    return formatter.format(instant);
}

public static String uTCDateTimeString(long epochMilliUtc) {
    Instant instant = Instant.ofEpochMilli(epochMilliUtc);
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MMM dd, yyyy, hh:mm:ss a", Locale.US).withZone(ZoneId.of("UTC"));
    return formatter.format(instant);

}

public static long convertDateStringToLongUTC(String stringUTCDate) {
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MMM dd, yyyy, hh:mm:ss a", Locale.ENGLISH);
    LocalDateTime localDate = LocalDateTime.parse(stringUTCDate, formatter);
    long timeInMilliseconds = localDate.atOffset(ZoneOffset.UTC).toInstant().toEpochMilli();
    return timeInMilliseconds;
}

}

@Test
public void timeConversionTest() {
    long currentTimeUtc = Instant.now(Clock.systemUTC()).toEpochMilli();
    String utc = TimeConversionUtil.uTCDateTimeString(currentTimeUtc);
    Long utcLongTime = TimeConversionUtil.convertDateStringToLongUTC(utc);
    String utc1 = TimeConversionUtil.uTCDateTimeString(utcLongTime);
    assertTrue(utc.equalsIgnoreCase(utc1));
}

Answer 3

Update for DateTimeFormatter introduced in API 26.

Code can be written as below for API 26 and above

// Below Imports are required for this code snippet
// import java.util.Locale;
// import java.time.LocalDateTime;
// import java.time.ZoneOffset;
// import java.time.format.DateTimeFormatter;
String date = "Tue Apr 23 16:08:28 GMT+05:30 2013";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("EEE MMM dd HH:mm:ss z yyyy", Locale.ENGLISH);
LocalDateTime localDate = LocalDateTime.parse(date, formatter);
long timeInMilliseconds = localDate.atOffset(ZoneOffset.UTC).toInstant().toEpochMilli();
Log.d(TAG, "Date in milli :: FOR API >= 26 >>> " + timeInMilliseconds);
// Output is -> Date in milli :: FOR API >= 26 >>> 1366733308000

But as of now only 6% of devices are running on 26 or above. So you will require backward compatibility for above classes. JakeWharton has been written ThreeTenABP which is based on ThreeTenBP, but specially developed to work on Android. Read more about How and Why ThreeTenABP should be used instead-of java.time, ThreeTen-Backport, or even Joda-Time

So using ThreeTenABP, above code can be written as (and verified on API 16 to API 29)

// Below Imports are required for this code snippet
// import java.util.Locale;
// import org.threeten.bp.OffsetDateTime;
// import org.threeten.bp.format.DateTimeFormatter;
DateTimeFormatter formatter = DateTimeFormatter.ofPattern(
        "EEE MMM dd HH:mm:ss OOOO yyyy", Locale.ROOT);
String givenDateString = "Tue Apr 23 16:08:28 GMT+05:30 2013";
long timeInMilliseconds = OffsetDateTime.parse(givenDateString, formatter)
        .toInstant()
        .toEpochMilli();
System.out.println("Date in milli :: USING ThreeTenABP >>> " + timeInMilliseconds);
// Output is -> Date in milli :: USING ThreeTenABP >>> 1366713508000

Ole covered summarised information (for Java too) in his answer, you should look into.

---

Below is old approach (and previous version of this answer) which should not be used now

Use below method

String givenDateString = "Tue Apr 23 16:08:28 GMT+05:30 2013"; 
SimpleDateFormat sdf = new SimpleDateFormat("EEE MMM dd HH:mm:ss z yyyy");
try {
    Date mDate = sdf.parse(givenDateString);
    long timeInMilliseconds = mDate.getTime();
    System.out.println("Date in milli :: " + timeInMilliseconds);
} catch (ParseException e) {
            e.printStackTrace();
}

---

Read more about date and time pattern strings.

Answer 4

Covert date and time string to milliseconds:

 public static final String DATE_TIME_FORMAT = "MM/dd/yyyy HH:mm:ss a";

or

  public static final String DATE_TIME_FORMAT = "yyyy-MM-dd'T'HH:mm:ss";

or

  public static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd'T'HH:mm:ssZZZZZ";
  //TimeZone.getAvailableIds() to list all timezone ids
  String timeZone = "EST5EDT";//it can be anything timezone like IST, GMT.
  String time = "2/21/2018 7:41:00 AM";

 public static long[] convertTimeInMillis(String dateTimeFormat, String timeZone, String... times) throws ParseException {

   SimpleDateFormat dateFormat = new SimpleDateFormat(dateTimeFormat, Locale.getDefault());
   dateFormat.setTimeZone(TimeZone.getTimeZone(timeZone));
   long[] ret = new long[times.length];
   for (int i = 0; i < times.length; i++) {
      String timeWithTZ = times[i] + " "+timeZone;
      Date d = dateFormat.parse(timeWithTZ);
      ret[i] = d.getTime();
    }
  return ret;

}

//millis to dateString

  public static String convertTimeInMillisToDateString(long timeInMillis, String DATE_TIME_FORMAT) {
     Date d = new Date(timeInMillis);
     SimpleDateFormat sdf = new SimpleDateFormat(dateFormat);
     return sdf.format(d);
  }

Answer 5

Try this in Kotlin,

val calendar = Calendar.getInstance()
val UniqueID = calendar.timeInMillis

same code in Java,

Calendar calendar = Calendar.getInstance(); long time = calendar.getTimeInMillis();

Answer 6

Date beginupd = new Date(cursor1.getLong(1));

This variable beginupd contains the format

Wed Oct 12 11:55:03 GMT+05:30 2011

long millisecond = beginupd.getTime();

Date.getTime() JavaDoc states:

Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this Date object.