gmt – Page 2 – Tarik Billa

SimpleDateFormat parse loses timezone [duplicate]

March 27, 2023 by Tarik

All I needed was this : SimpleDateFormat sdf = new SimpleDateFormat(“yyyy.MM.dd HH:mm:ss”); sdf.setTimeZone(TimeZone.getTimeZone(“GMT”)); SimpleDateFormat sdfLocal = new SimpleDateFormat(“yyyy.MM.dd HH:mm:ss”); try { String d = sdf.format(new Date()); System.out.println(d); System.out.println(sdfLocal.parse(d)); } catch (Exception e) { e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates. } Output : slightly dubious, but I want … Read more

How to subtract hours from a datetime in MySQL?

February 5, 2023 by Tarik

mySQL has DATE_SUB(): SELECT DATE_SUB(column, INTERVAL 3 HOUR)…. but would it not be better to try and sort out the underlying time zone issue instead?

Force Java timezone as GMT/UTC

December 26, 2022 by Tarik

The OP answered this question to change the default timezone for a single instance of a running JVM, set the user.timezone system property: java -Duser.timezone=GMT … <main-class> If you need to set specific time zones when retrieving Date/Time/Timestamp objects from a database ResultSet, use the second form of the getXXX methods that takes a Calendar … Read more

What is the difference between UTC and GMT?

November 14, 2022 by Tarik

Astronomy versus Atomic clock By the original definitions the difference is that GMT (also officially known as Universal Time (UT), which may be confusing) is based on astronomical observations while UTC is based on atomic clocks. Later GMT has become to be used at least unofficially to refer to UTC, which blurs the distinction somewhat. … Read more

How can I get the current date and time in UTC or GMT in Java?

September 12, 2022 by Tarik

tl;dr Instant.now() // Capture the current moment in UTC. Generate a String to represent that value: Instant.now().toString() 2016-09-13T23:30:52.123Z Details As the correct answer by Jon Skeet stated, a java.util.Date object has no time zone†. But its toString implementation applies the JVM’s default time zone when generating the String representation of that date-time value. Confusingly to … Read more