My date-time format string is : yyyy-MM-dd'T'HH:mm:ss.SSSZ
I am using DateTimeFormatter from Joda Time to print my date in the above mentioned format.
Now, consider the date as
2016/04/01 23:00:00
then it should have printed
2016-04-01T23:00:00.000Z
But, it prints
2016-04-01T23:00:00.000+0200
Please help me in getting the date printed in the same format as specified in the string format.
2016-04-01T23:00:00.000Z != 2016-04-01T23:00:00.000+0200
Here is what Basil Bourque has commented on the wrong answer:
No, no, no. All you have done is append text, creating a falsity. If
your date-time represents a moment in a time zone that is two hours
ahead of UTC such as Europe/Helsinki, and you slap a Z on the end
which says Zulu and means UTC, you are now telling a lie, representing
value that is off by two hours. This is like replacing the dollar sign
in a price with a Euro currency symbol but failing to change the
number.
Just to illustrate what he has mentioned:
£100 != $100
The Z in 2016-04-01T23:00:00.000Z is the timezone designator for zero-timezone offset. It stands for Zulu and specifies the Etc/UTC timezone (which has the timezone offset of +00:00 hours). The same moment will be presented in different timezones with different values e.g.
import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
public class Main {
public static void main(String[] args) {
Instant instant = Instant.parse("2016-04-01T23:00:00.000Z");
ZonedDateTime zdtNewYork = instant.atZone(ZoneId.of("America/New_York"));
ZonedDateTime zdtIndia = instant.atZone(ZoneId.of("Asia/Kolkata"));
ZonedDateTime zdtNepal = instant.atZone(ZoneId.of("Asia/Kathmandu"));
System.out.println(zdtNewYork);
System.out.println(zdtIndia);
System.out.println(zdtNepal);
// Or at a fixed timezone offset of +02:00 hours
OffsetDateTime odtWithTwoHoursOffset = instant.atOffset(ZoneOffset.of("+02:00"));
System.out.println(odtWithTwoHoursOffset);
}
}
Output:
2016-04-01T19:00-04:00[America/New_York]
2016-04-02T04:30+05:30[Asia/Kolkata]
2016-04-02T04:45+05:45[Asia/Kathmandu]
2016-04-02T01:00+02:00
To understand this concept a bit further, try converting a date-time from one timezone to another e.g. I have shown a conversion of a New York date-time into UTC. I have shown another conversion of a date-time with a timezone offset of +02:00 hours into UTC.
import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
public class Main {
public static void main(String[] args) {
// #######Example of converting a date-time from one timezone to another#####
ZonedDateTime zdtNewYork = ZonedDateTime.parse("2016-04-01T19:00-04:00[America/New_York]");
Instant instant = zdtNewYork.toInstant();
System.out.println(instant);
// Or as ZonedDateTime
ZonedDateTime zdtUtc = zdtNewYork.withZoneSameInstant(ZoneId.of("Etc/UTC"));
System.out.println(zdtUtc);
// Alternatively, this can be obtained from instant
zdtUtc = instant.atZone(ZoneId.of("Etc/UTC"));
System.out.println(zdtUtc);
// ###########################################################################
System.out.println();
// #####Example of converting a date-time at a fixed timezone offset to UTC###
OffsetDateTime odtNewYork = OffsetDateTime.parse("2016-04-02T01:00+02:00");
instant = odtNewYork.toInstant();
System.out.println(instant);
// Alternatively
OffsetDateTime odtUtc = odtNewYork.withOffsetSameInstant(ZoneOffset.UTC);
System.out.println(odtUtc);
// Alternatively,
odtUtc = instant.atOffset(ZoneOffset.UTC);
System.out.println(odtUtc);
// ###########################################################################
}
}
Output:
2016-04-01T23:00:00Z
2016-04-01T23:00Z[Etc/UTC]
2016-04-01T23:00Z[Etc/UTC]
2016-04-01T23:00:00Z
2016-04-01T23:00Z
2016-04-01T23:00Z
According https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html Z has special meaning:
Z zone-offset
If you want to escape Z quote Z with ':
yyyy-MM-dd'T'HH:mm:ss.SSS'Z'
For example:
java.time.LocalDateTime date = java.time.LocalDateTime.now();
java.time.format.DateTimeFormatter formatter = java.time.format.DateTimeFormatter
.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
java.lang.String text = date.format(formatter);
System.out.println(text);
prints
2016-06-11T18:39:41.962Z
Related
I receive this Date Time pattern from Server as a string.
Sa. 07.01.2023 16:39:15
Now i want to check if 1 minute is over.
Like if the gap between the current time and the time (received as a string) from server is
longer than a minute.
The time zone is in Europe. Like Austria.
Parse the given date-time string into a LocalDateTime.
Convert the obtained LocalDateTime into a ZonedDateTime by applying a ZoneId.
Get the current ZonedDateTime in the applied ZoneId.
Finally, find the minutes between the current ZonedDateTime and the ZonedDateTime obtained from the date-time string.
Demo:
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.util.Locale;
class Main {
public static void main(String[] args) {
String strDateTime = "Sa. 07.01.2023 16:39:15";
DateTimeFormatter parser = DateTimeFormatter.ofPattern("EEE dd.MM.uuuu HH:mm:ss", Locale.GERMAN);
// Note: change the ZoneId as per your requirement
ZonedDateTime zdt = LocalDateTime.parse(strDateTime, parser)
.atZone(ZoneId.of("Europe/Vienna"));
System.out.println("Date-time received from the server: " + zdt);
ZonedDateTime now = ZonedDateTime.now(zdt.getZone());
System.out.println("Current date-time: " + now);
System.out.println(ChronoUnit.MINUTES.between(zdt, now) > 1);
}
}
Output from a sample run:
Date-time received from the server: 2023-01-07T16:39:15+01:00[Europe/Vienna]
Current date-time: 2023-01-07T17:33:04.140599+01:00[Europe/Vienna]
true
ONLINE DEMO
Learn more about the modern Date-Time API from Trail: Date Time.
Incorporating the following valuable alternative solution suggested by Basil Bourque:
Might be more clear if you switch to Instant objects at the end.
Extract an Instant from your first ZonedDateTime, and change
ZonedDateTime now to Instant now.
class Main {
public static void main(String[] args) {
String strDateTime = "Sa. 07.01.2023 16:39:15";
DateTimeFormatter parser = DateTimeFormatter.ofPattern("EEE dd.MM.uuuu HH:mm:ss", Locale.GERMAN);
// Note: change the ZoneId as per your requirement
Instant instantParsed = LocalDateTime.parse(strDateTime, parser)
.atZone(ZoneId.of("Europe/Vienna"))
.toInstant();
System.out.println("Instant received from the server: " + instantParsed);
Instant instantNow = Instant.now();
System.out.println("Current instant: " + instantNow);
System.out.println(ChronoUnit.MINUTES.between(instantParsed, instantNow) > 1);
}
}
ONLINE DEMO
I am reading data from upstream system and it returns the date in string format like this,
String dateFromUpstream = 11-14-2022 10:41:12 EDT
Now, I want to convert this string to a date format of UTC timezone and then store it into my entity.
I tried the following way,
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM-dd-yyyy HH:mm:ss z");
LocalDateTime date = ZonedDateTime.parse(dateFromUpstream, formatter).toLocalDateTime().atZone(ZoneId.of("UTC"));
But this doesn't change the date to UTC timezone. It still gives me the same date with UTC instead of EDT at the end of the string.
Anyone know how I can do this and then store into an entity?
Parse the given date-time string into a ZonedDateTime with the corresponding DateTimeFormatter and then convert the resulting ZonedDateTime into an Instant or another ZonedDateTime corresponding to UTC, using ZonedDateTime#withZoneSameInstant.
Demo:
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
public class Main {
public static void main(String[] args) {
String dateFromUpstream = "11-14-2022 10:41:12 EDT";
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("MM-dd-uuuu HH:mm:ss z", Locale.ENGLISH);
ZonedDateTime zdt = ZonedDateTime.parse(dateFromUpstream, dtf);
Instant instant = zdt.toInstant();
System.out.println(instant);
// Or get a ZonedDateTime at UTC
ZonedDateTime zdtUTC = zdt.withZoneSameInstant(ZoneOffset.UTC);
System.out.println(zdtUTC);
// If you want LocalDateTime
LocalDateTime ldt = zdtUTC.toLocalDateTime();
System.out.println(ldt);
}
}
See this code run at Ideone.com.
Output:
2022-11-14T15:41:12Z
2022-11-14T15:41:12Z
2022-11-14T15:41:12
Learn more about the modern Date-Time API from Trail: Date Time.
Note: As suggested by Basil Bourque, you can convert the parsed date-time into an OffsetDateTime at UTC as shown below:
OffsetDateTime odtUTC = zdt.toOffsetDateTime()
.withOffsetSameInstant(ZoneOffset.UTC);
I have a UTC date-time like this (a String): 2022-11-22T17:15:00
And a ZoneID like this: "America/Tijuana"
Using java.time API, I want to get the actual datetime for that zone, which is: 2022-11-22T09:15:00 (the time is 09:15 instead of 17:15)
ZonedDateTime.toLocalDateTime() returns: 2022-11-22T17:15
ZonedDateTime.toString() returns:
2022-11-22T17:15-08:00[America/Tijuana]
None of the above gives me what I'm looking for.
This is my code:
ZoneId zonaID = ZoneId.of('America/Tijuana');
CharSequence dateUTC = "2022-11-22T17:15:00";
LocalDateTime dateTimeL = LocalDateTime.parse(dateUTC);
ZonedDateTime myZDT = ZonedDateTime.now();
ZonedDateTime myZDTFinal = myZDT.of(dateTimeL, zonaID);
System.out.println("using toLocalDateTime: " + myZDTFinal.toLocalDateTime());
System.out.println("using toString: " + myZDTFinal.toString());
I know that this might be a duplicated question but there's so many questions about date-times and I just haven't been able to figure out this.
Any help will be really appreciated.
You have to convert your date to UTC, then convert the convert this zone to your expected zone using withZoneSameInstant like this:
ZonedDateTime toUTCZone = ZonedDateTime.of(dateTimeL, ZoneOffset.UTC);
ZonedDateTime myZDTFinal = toUTCZone.withZoneSameInstant(zonaID);
Output
2022-11-22T09:15-08:00[America/Tijuana]
There can be many ways to achieve the result. A simple approach would be
Parse the given string into LocalDateTime.
Convert it into an OffsetDateTime at UTC using LocalDateTime#atOffset.
Use OffsetDateTime#atZoneSameInstant to convert the resulting OffsetDateTime into a ZonedDateTime at ZoneId.of("America/Tijuana").
Get LocalDateTime out of the resulting ZonedDateTime by using ZonedDateTime#toLocalDateTime.
If required, format this LocalDateTime into the desired string.
LocalDateTime
.parse("2022-11-22T17:15:00") // Parse the given date-time string into LocalDateTime
.atOffset(ZoneOffset.UTC) // Convert it into a ZonedDateTime at UTC
.atZoneSameInstant(ZoneId.of("America/Tijuana")) // Convert the result into a ZonedDateTime at another time-zome
.toLocalDateTime() // Get the LocalDateTime out of the ZonedDateTime
.format(DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ss", Locale.ENGLISH))); // If required
Demo:
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
public class Main {
public static void main(String[] args) {
LocalDateTime ldtInTijuana = LocalDateTime.parse("2022-11-22T17:15:00")
.atOffset(ZoneOffset.UTC)
.atZoneSameInstant(ZoneId.of("America/Tijuana"))
.toLocalDateTime();
System.out.println(ldtInTijuana);
// Custom format
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ss", Locale.ENGLISH);
String formatted = ldtInTijuana.format(formatter);
System.out.println(formatted);
}
}
Output:
2022-11-22T09:15
2022-11-22T09:15:00
Note that LocalDateTime#toString removes second and fraction-of-second values if they are zero. Suppose you want to keep them (as you have posted in your question), you can use a DateTimeFormatter as shown above.
An alternate approach:
Alternatively, you can append Z at the end of your ISO 8601 formatted date-time string to enable Instant to parse it and then convert the Instant into a ZonedDateTime corresponding to the ZoneId.of("America/Tijuana") by using Instant#atZone. The symbol, Z refers to UTC in a date-time string.
The rest of the steps will remain the same.
Demo:
public class Main {
public static void main(String[] args) {
String text = "2022-11-22T17:15:00";
text = text + "Z"; // Z refers to UTC
Instant instant = Instant.parse(text);
LocalDateTime ldt = instant.atZone(ZoneId.of("America/Tijuana")).toLocalDateTime();
System.out.println(ldt);
}
}
Output:
2022-11-22T09:15
Learn more about the modern Date-Time API from Trail: Date Time.
I have below code.
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
LocalDateTime myDate = LocalDateTime.parse("2020-11-16T02:27:39.345Z", formatter);
But it throws below error in the second line. Not sure why it's complaining Z
java.time.format.DateTimeParseException: Text '2020-11-16T02:27:39.345Z' could not be parsed at index 23
at java.base/java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:2046)
at java.base/java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1948)
at java.base/java.time.LocalDateTime.parse(LocalDateTime.java:492)
LocalDateTime does not have timezone or zone-offset information whereas your date-time string has zone-offset. The letter, Z at the end of your date-time string stands for Zulu i.e. zone-offset of UTC. You can parse it into OffsetDateTime or ZonedDateTime or Instant directly (i.e. without using a custom DateTimeFormatter).
Demo:
import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.ZonedDateTime;
public class Main {
public static void main(String[] args) {
String dateTimeString = "2020-11-16T02:27:39.345Z";
OffsetDateTime odt = OffsetDateTime.parse(dateTimeString);
System.out.println(odt);
ZonedDateTime zdt = ZonedDateTime.parse(dateTimeString);
System.out.println(zdt);
Instant instant = Instant.parse(dateTimeString);
System.out.println(instant);
}
}
Output:
2020-11-16T02:27:39.345Z
2020-11-16T02:27:39.345Z
2020-11-16T02:27:39.345Z
I am using Java 8
This is what my ZonedDateTime looks like
2013-07-10T02:52:49+12:00
I get this value as
z1.format(DateTimeFormatter.ISO_OFFSET_DATE_TIME)
where z1 is a ZonedDateTime.
I wanted to convert this value as 2013-07-10T14:52:49
How can I do that?
Is this what you want?
This converts your ZonedDateTime to a LocalDateTime with a given ZoneId by converting your ZonedDateTime to an Instant before.
LocalDateTime localDateTime = LocalDateTime.ofInstant(z1.toInstant(), ZoneOffset.UTC);
Or maybe you want the users system-timezone instead of hardcoded UTC:
LocalDateTime localDateTime = LocalDateTime.ofInstant(z1.toInstant(), ZoneId.systemDefault());
It looks like you need to convert to the desired time zone (UTC) before sending it to the formatter.
z1.withZoneSameInstant( ZoneId.of("UTC") )
.format( DateTimeFormatter.ISO_OFFSET_DATE_TIME )
should give you something like 2018-08-28T17:41:38.213Z
#SimMac Thanks for the clarity. I also faced the same issue and able to find the answer based on his suggestion.
public static void main(String[] args) {
try {
String dateTime = "MM/dd/yyyy HH:mm:ss";
String date = "09/17/2017 20:53:31";
Integer gmtPSTOffset = -8;
ZoneOffset offset = ZoneOffset.ofHours(gmtPSTOffset);
// String to LocalDateTime
LocalDateTime ldt = LocalDateTime.parse(date, DateTimeFormatter.ofPattern(dateTime));
// Set the generated LocalDateTime's TimeZone. In this case I set it to UTC
ZonedDateTime ldtUTC = ldt.atZone(ZoneOffset.UTC);
System.out.println("UTC time with Timezone : "+ldtUTC);
// Convert above UTC to PST. You can pass ZoneOffset or Zone for 2nd parameter
LocalDateTime ldtPST = LocalDateTime.ofInstant(ldtUTC.toInstant(), offset);
System.out.println("PST time without offset : "+ldtPST);
// If you want UTC time with timezone
ZoneId zoneId = ZoneId.of( "America/Los_Angeles" );
ZonedDateTime zdtPST = ldtUTC.toLocalDateTime().atZone(zoneId);
System.out.println("PST time with Offset and TimeZone : "+zdtPST);
} catch (Exception e) {
}
}
Output:
UTC time with Timezone : 2017-09-17T20:53:31Z
PST time without offset : 2017-09-17T12:53:31
PST time with Offset and TimeZone : 2017-09-17T20:53:31-08:00[America/Los_Angeles]
If z1 is an instance of ZonedDateTime, then the expression
z1.withZoneSameInstant(ZoneOffset.UTC).toLocalDateTime()
evaluates to an instance of LocalDateTime with the string representation requested by the OP. This is illustrated by the following program:
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.temporal.ChronoUnit;
public class Main {
public static void main(String[] args) {
ZonedDateTime time = ZonedDateTime.now();
ZonedDateTime truncatedTime = time.truncatedTo(ChronoUnit.SECONDS);
ZonedDateTime truncatedTimeUtc = truncatedTime.withZoneSameInstant(ZoneOffset.UTC);
LocalDateTime truncatedTimeUtcNoZone = truncatedTimeUtc.toLocalDateTime();
System.out.println(time);
System.out.println(truncatedTime);
System.out.println(truncatedTimeUtc);
System.out.println(truncatedTimeUtcNoZone);
}
}
Sample output:
2020-10-26T16:45:21.735836-03:00[America/Sao_Paulo]
2020-10-26T16:45:21-03:00[America/Sao_Paulo]
2020-10-26T19:45:21Z
2020-10-26T19:45:21
I wanted to convert this value as 2013-07-10T14:52:49
👉 2013-07-10T02:52:49+12:00 ≠ 2013-07-10T14:52:49 at UTC
👉 2013-07-10T02:52:49+12:00 = 2013-06-09T14:52:49 at UTC (which is obtained by subtracting 12:00 hours of the offset from 2013-07-10T02:52:49).
Demo:
import java.time.LocalDateTime;
import java.time.OffsetDateTime;
import java.time.ZoneOffset;
class Main {
public static void main(String[] args) {
ZoneOffset zoneOffset = ZoneOffset.of("+12:00");
OffsetDateTime odtGiven = OffsetDateTime.of(LocalDateTime.of(2013, 7, 10, 2, 52, 49), zoneOffset);
System.out.println(odtGiven);
OffsetDateTime odtUtc = odtGiven.withOffsetSameInstant(ZoneOffset.UTC);
System.out.println(odtUtc);
System.out.println(odtUtc.toLocalDateTime());
}
}
Output:
2013-07-10T02:52:49+12:00
2013-07-09T14:52:49Z
2013-07-09T14:52:49
Learn about the modern Date-Time API from Trail: Date Time.