JavaScript What timestamp format is this value 1522899000000? ionic or AngularJS. How can I use it in Java what timestamp format is this,what is timestamp format in

tl;dr

Apparently, 1522899000000 is a count of milliseconds since the epoch reference of 1970-01-01T00:00:00Z, first moment of 1970 in UTC.

Instant.ofEpochMilli( 1_522_899_000_000L )

2018-04-05T03:30:00Z

java.time

The modern approach uses the java.time classes that supplant the troublesome old legacy classes (Date, Calendar, SimpleDateFormat).

Your input seems to be a count of milliseconds since the epoch of 1970-01-01T00:00Z. Sometimes known as Unix time, though not definitively.

Instant

So parse as an Instant. The Instant class represents a moment on the timeline in UTC with a resolution of nanoseconds (up to nine (9) digits of a decimal fraction).

long input = 1_522_899_000_000L ;
Instant instant = Instant.ofEpochMilli( input );

instant.toString(): 2018-04-05T03:30:00Z

If your input is textual, parse as a number with Long.parse.

long input = Long.parseLong( "1522899000000" ) ;
Instant instant = Instant.ofEpochMilli( input );

ZonedDateTime

An Instant is always in UTC, by definition. If you want to see that same moment through the wall-clock time used by people of a certain region (a time zone), apply a ZoneId to get a ZonedDateTime object.

Specify a proper time zone name in the format of continent/region, such as America/Montreal, Africa/Casablanca, or Pacific/Auckland. Never use the 3-4 letter pseudo-zones such as EST or IST as they are not true time zones, not standardized, and not even unique(!).

ZoneId z = ZoneId.of( "Pacific/Auckland" ) ;
ZonedDateTime zdt = instant.atZone( z ) ;

zdt.toString(): 2018-04-05T15:30+12:00[Pacific/Auckland]

DateTimeFormatter

The strings generated above are in standard ISO 8601 format. For other formats, search Stack Overflow for the DateTimeFormatter class.


About java.time

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

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

To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.

You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.

Where to obtain the java.time classes?

The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval, YearWeek, YearQuarter, and more.

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