date and time show parse error at specific index

Question

I am getting date and time from JSON API URL which format is like this

    '2021-03-05 09:18:07' which is in String form.

but when I want to convert it in milliseconds it gives me an error of index 10. I don't know why this issue is coming I check other Stackoverflow answer but did not successed

  DateTimeFormatter formatter ;
                                if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
                                    formatter = DateTimeFormatter.ofPattern(
                                            "yyyy-MM-dd'T'HH:mm:ss", Locale.ROOT);
                                    String dates = object.getString("created_at");
                                   long  timeInMilliseconds = OffsetDateTime.parse(dates, formatter)
                                            .toInstant()
                                            .toEpochMilli();
                                    System.out.println("Date in milli :: USING ThreeTenABP >>> " + 
                                   timeInMilliseconds);

                                }
                                String text = TimeAgo.using(timeInMilliseconds);
                                FeedModel.setDateSnap(text);

and here is error

     java.time.format.DateTimeParseException: Text '2021-03-05 09:18:07' could not be parsed: Unable 
     to obtain OffsetDateTime from TemporalAccessor: {},ISO resolved to 2021-03-05T09:18:07 of type 
     java.time.format.Parsed
    at java.time.format.DateTimeFormatter.createError(DateTimeFormatter.java:1920)
    at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1855)
    at java.time.OffsetDateTime.parse(OffsetDateTime.java:396)
    at com.example.wasigram.MainActivity$1.onResponse(MainActivity.java:91)
    at com.androidnetworking.common.ANRequest.deliverSuccessResponse(ANRequest.java:729)
    at com.androidnetworking.common.ANRequest.access$6500(ANRequest.java:80)
    at com.androidnetworking.common.ANRequest$6.run(ANRequest.java:709)
    at android.os.Handler.handleCallback(Handler.java:888)
    at android.os.Handler.dispatchMessage(Handler.java:100)
    at android.os.Looper.loop(Looper.java:213)
    at android.app.ActivityThread.main(ActivityThread.java:8178)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1101)
 Caused by: java.time.DateTimeException: Unable to obtain OffsetDateTime from TemporalAccessor: {},ISO resolved to 2021-03-05T09:18:07 of type java.time.format.Parsed
    

Answer 1

Using Java SE 8 API:

You can use DateTimeFormatter#withZone to get a formatter with the specified zone.

Also, use the correct format, yyyy-MM-dd HH:mm:ss which does not have 'T' which you have put in your pattern by mistake. In fact, I prefer using u to y as explained in this answer.

Demo:

import java.time.OffsetDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        String strDateTime = "2021-03-05 09:18:07";
        
        DateTimeFormatter formatter = DateTimeFormatter
                                        .ofPattern("uuuu-MM-dd HH:mm:ss", Locale.ENGLISH)
                                        .withZone(ZoneOffset.UTC);
        
        long millis = OffsetDateTime
                        .parse(strDateTime, formatter)
                        .toInstant()
                        .toEpochMilli();
        
        System.out.println(millis);
    }
}

Output:

1614935887000

Learn more about the modern date-time API from Trail: Date Time.

Using ThreeTen-Backport API:

import java.util.Locale;

import org.threeten.bp.LocalDateTime;
import org.threeten.bp.ZoneOffset;
import org.threeten.bp.format.DateTimeFormatter;

public class Main {
    public static void main(String[] args) {
        String strDateTime = "2021-03-05 09:18:07";
        
        DateTimeFormatter formatter = DateTimeFormatter
                                        .ofPattern("uuuu-MM-dd HH:mm:ss", Locale.ENGLISH);
        
        long millis = LocalDateTime
                        .parse(strDateTime, formatter)
                        .toInstant(ZoneOffset.UTC)
                        .toEpochMilli();
        
        System.out.println(millis);
    }
}

Output:

1614935887000