Use time zone names, not 3-letter codes. Better to specify a time zone explicitly than rely on default.
JAVA GET UTC TIME CODE
Here is some example code using Joda-Time 2.3 and Java 8. Always specify a time zone, never assume or rely on default. Your users and your servers can easily move to other time zones, so forget about your own time zone. Only convert to localized date-time for presentation in the user-interface. DST applies to the date specified by the question.ĭate-time work becomes easier and less error-prone if you think, work, and store in UTC/GMT. Sydney Australia has a standard time of 10 hours ahead of UTC/GMT, and a Daylight Saving Time (DST) of 11 hours ahead. In Joda-Time, a DateTime instance knows its own time zone.
JAVA GET UTC TIME HOW TO
Joda-Time even knows how to count – January is 1, not 0! Time Zone Notice how much simpler and more obvious is the Joda-Time code shown below. Use either Joda-Time or, in Java 8, the new java.time.* classes defined by JSR 310 and inspired by Joda-Time. The /Calendar classes are notoriously bad. Use proper time zone names, mostly Continent/CityOrRegion such as America/Montreal or Asia/Kolkata. You should avoid using 3 or 4 letter time zone codes such as EST or IST.
The Joda-Time library is now supplanted by the java.time framework built into Java 8 and later.
Anyway still result is different because EST is UTC-5 hours. This makes me more confused because Mac says its timezone is (AEDT) Australian Eastern Daylight Time but Java is EST. Does not Calendar work the way I expect?Īdded z to display timezone. I thought I could have 00:12:00 for c2 because UTC time is 11 hours later than mine. (sdf.format(c1.getTime())) Ĭalendar c2 = Calendar.getInstance(TimeZone.getTimeZone("UTC")) Ĭ2.set(year, month, date, hourOfDay, minute, second) SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss z") Timezone in my system is Australia/Sydney( UTC + 11:00), and I have got the result below when I tested timezone: int year = 2014 Ĭ1.set(year, month, date, hourOfDay, minute, second) Server will convert it to local timezone when it displays time to users. I want to get UTC time in milliseconds from a device and send to server.
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