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How To Include Milliseconds In A Formatted Date String?

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Hi I am coding the following: String sph=(String) android.text.format.DateFormat.format('yyyy-MM-dd_hh-mm-ss_SSS', new java.util.Date()); I want the current date and time and mil

Solution 1:

Use the following: 

SimpleDateFormatformatter=newSimpleDateFormat("yyyy-MM-dd_HH-mm-ss_SSS");
StringdateString= formatter.format(newjava.util.Date());

Solution 2:

tl;dr

ZonedDateTime          // Represent a moment in the wall-clock time used by the people of a certain region (atime zone).
.now()                 // Capture current moment. Better to pass optional argument for `ZoneId` (time zone). Returns a `ZonedDateTime` object.
.format(               // Generate a `String` with text in a custom formatting pattern.
    DateTimeFormatter.ofPattern( "uuuu-MM-dd_HH-mm-ss-SSS" )
)                      // Returns a `String` object.

2018-08-26_15-43-24-895

Instant

You are using troublesome old legacy date-time classes. Instead use the java.time classes.

If you want the date-time in UTC, use the Instant class. This class holds nanosecond resolution, more than enough for milliseconds.

Instantinstant= Instant.now();
Stringoutput= instant.toString();

That toString method uses the DateTimeFormatter.ISO_INSTANT formatter which prints 0, 3, 6, or 9 digits in the decimal fraction, as many as needed appropriate to the actual data value.

In Java 8 the current moment is captured only up to milliseconds but a new implementation of Clock in Java 9 may capture up to nanoseconds. So truncate to milliseconds if that is your requirement. Specify your desired truncation by a TemporalUnit as implemented in ChronoUnit.MILLIS.

Instantinstant= Instant.now().truncatedTo( ChronoUnit.MILLIS );

ZonedDateTime

If you want a specify time zone, apply a ZoneId to get a ZonedDateTime.

Instantinstant= Instant.now();

instant.toString(): 2018-08-26T19:43:24.895621Z

InstantinstantTruncated= instant.truncatedTo( ChronoUnit.MILLIS );

instantTruncated.toString(): 2018-08-26T19:43:24.895Z

ZoneIdzoneId= ZoneId.of( "America/Montreal" );
ZonedDateTimezdt= instant.atZone( zoneId );
Stringoutput= zdt.toString();

2018-08-26T15:43:24.895621-04:00[America/Montreal]

Again if you want other formats, search Stack Overflow for DateTimeFormatter.

DateTimeFormatter

If you want to force three digits for milliseconds, even if the value is all zeros, specify a custom formatting pattern using DateTimeFormatter class.

DateTimeFormatterf= DateTimeFormatter.ofPattern( "uuuu-MM-dd_HH-mm-ss-SSS" ) ;
Stringoutput= zdt.format( f ) ;

2018-08-26_15-43-24-895

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?

Solution 3:

Try using the same format with SimpleDateFormat

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