0

I'm trying to convert a time in format "PT10H30M" to format "10:30 AM" and save this on Date, time or timestamp variable in Java Android.

Any solution to do this?

RaZoDiuM
  • 203
  • 1
  • 10
  • What type of `Object` do you want to end up with? `Calendar`? `Date`? – MacLean Sochor Jul 14 '17 at 18:44
  • I prefer Date or Time, I don´t know if exits Timestamp in JAVA, but any type, just need convert "PT10H30M" to "10:30 AM" – RaZoDiuM Jul 14 '17 at 18:46
  • 1
    Your input string represents a span-of-time unattached to the timeline. The correct object representation for that is a [`Duration`](https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html) in java.time (see Answer by Hugo below for [back-port to Android](https://github.com/JakeWharton/ThreeTenABP)). A time-of-day such as "10:30 AM" is *not* a span-of-time. Your input string is already in the correct textual representation for such a span-of-time, defined by the [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) standard. – Basil Bourque Jul 14 '17 at 21:29

1 Answers1

2

Technically, PT10H30M is not a time, it's a representing duration: an amount of time (an amount of 10 hours and 30 minutes). That string is in standard ISO 8601 format.

Although the "name" (10 hours and 30 minutes) is similar to 10:30 AM (10 hours and 30 minutes AM), they're totally different concepts:

  • 10:30 AM represents a time of the day
  • PT10H30M represents an amount of time - that can be, for example, added to a date/time:
    • 01:00 AM plus the duration of PT10H30M results in 11:30 AM
    • 11:00 PM plus the duration of PT10H30M results in 09:30 AM of the next day

Anyway, you could achieve what you want by adding the duration of PT10H30M to midnight (00:00).

In Android you can use the ThreeTen Backport, a great backport for Java 8's new date/time classes. You'll also need the ThreeTenABP (more on how to use it here).

You can use a LocalTime (which represents a time, with hour, minutes, seconds and nanoseconds), using a constant for midnight 00:00:00.0, and add a Duration to it:

import org.threeten.bp.LocalTime;
import org.threeten.bp.Duration;

LocalTime time = LocalTime.MIDNIGHT.plus(Duration.parse("PT10H30M"));

The result will be a time variable that holds the value corresponding to 10:30 AM.

If you want the corresponding String, you can use a org.threeten.bp.format.DateTimeFormatter:

DateTimeFormatter fmt = DateTimeFormatter.ofPattern("h:mm a", Locale.ENGLISH);
System.out.println(time.format(fmt));

The result is a String with the value 10:30 AM. (Note that I also used a java.util.Locale to make sure it properly formats the String).

Basil Bourque
  • 303,325
  • 100
  • 852
  • 1,154
  • 1
    Exacty what I need, so many, many many thanks to you. Just a add, for use the import org.threeten.bp.LocalTime; import org.threeten.bp.Duration; Is necesary go to gradle and add dependency dependencies { compile 'com.jakewharton.threetenabp:threetenabp:1.0.3' } – RaZoDiuM Jul 14 '17 at 19:12
  • @RaZoDiuM On Stack Overflow, you are welcome to make such fixes or additions to an Answer yourself. – Basil Bourque Jul 14 '17 at 21:21