Android parse String to Date - unknown pattern character 'X'

Question

I have Service fetch date string from web and then I want to pare it to Date object. But somehow application crashes. This is my string that I\'m parsi

Answer 1

tl;dr

long millisecondsSinceEpoch = OffsetDateTime.parse( "2015-02-05T05:20:02+00:00" ).plusHour( 1 ).toInstant().toEpochMilli()  // Warning: Possible loss of data in truncating nanoseconds to milliseconds. But not in this particular case.

Details

Other answers are correct but now outdated. The old date-time classes are now legacy. Use java.time classes instead.

ISO 8601

The input String is in standard ISO 8601 format. Parse directly, no need to define a formatting pattern as the java.time classes use ISO 8601 formats by default.

OffsetDateTime

The input includes an offset-from-UTC with the +00:00 so we can parse as an OffsetDateTime object.

String input = "2015-02-05T05:20:02+00:00" ;
OffsetDateTime odt = OffsetDateTime.parse( input );

Math

If you want to add an hour or a minute later to set an alarm, call the plus methods.

OffsetDateTime minuteLater = odt.plusMinutes( 1 );
OffsetDateTime hourLater = odt.plusHours( 1 );

To get a count of milliseconds, go through the Instant class. The Instant class represents a moment on the timeline in UTC with a resolution of nanoseconds. Asking for milliseconds means possible data loss as the nine digits of a decimal fraction get truncated to the three digits of decimal fraction.

long millisecondsSinceEpoch = odt.toInstant().toEpochMilli();  // Warning: Possible loss of data in truncating nanoseconds to milliseconds.

About java.time

The java.time framework is built into Java 8 and later. These classes supplant the old troublesome date-time classes such as java.util.Date, .Calendar, & java.text.SimpleDateFormat.

The Joda-Time project, now in maintenance mode, advises migration to java.time.

To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations.

Much of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP.

The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time.