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

In Kotlin,

Just use

timeInMilSeconds = date.time

where timeInMilSeconds is milliseconds(var timeInMilSeconds: Long) and date is Date

Answer 2

Just to complement the given answers, if you need to convert the time given by the date to other time units you can use the TimeUnit API

Example:

TimeUnit.MILLISECONDS.toMinutes(millis)

Answer 3

java.time and ThreeTenABP

I am providing the modern answer — though not more modern than it works on your Android API level too.

    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(timeInMilliseconds);

Output from this snippet is:

1366713508000

The SimpleDateFormat, Date and Calendar classes used in most of the other answers are poorly designed and now long outdated. I recommend that instead you use java.time, the modern Java date and time API. Edit: The other answers were fine answers when the question was asked in 2013. Only time moves on, and we should not use SimpleDateFormat, Date and Calendar any more.

Question: Doesn’t java.time require Android API level 26?

java.time works nicely on both older and newer Android devices. It just requires at least Java 6.

• In Java 8 and later and on newer Android devices (from API level 26) the modern API comes built-in.
• In non-Android Java 6 and 7 get the ThreeTen Backport, the backport of the modern classes (ThreeTen for JSR 310; see the links at the bottom).
• On (older) Android use the Android edition of ThreeTen Backport. It’s called ThreeTenABP. And make sure you import the date and time classes from org.threeten.bp with subpackages.

Links

• Oracle tutorial: Date Time explaining how to use java.time.
• Java Specification Request (JSR) 310, where java.time was first described.
• ThreeTen Backport project, the backport of java.time to Java 6 and 7 (ThreeTen for JSR-310).
• ThreeTenABP, Android edition of ThreeTen Backport
• Question: How to use ThreeTenABP in Android Project, with a very thorough explanation.

Answer 4

try this...

Calendar calendar = Calendar.getInstance();
calendar.set(datePicker.getYear(), datePicker.getMonth(), datePicker.getDayOfMonth(), 
             timePicker.getCurrentHour(), timePicker.getCurrentMinute(), 0);
long startTime = calendar.getTimeInMillis();