java.time.instant

问题 This question already has answers here : Error: Text '1/31/2020' could not be parsed at index 0 while trying to parse string date (2 answers) Problem with parse a LocalDateTime using java 8 (2 answers) How to parse a 1 or 2 digit hour string with Java? (5 answers) Closed 4 months ago . I am attempting to capture the time before and after I check a timestamp value on a webpage and then confirm my timestamp falls in between those times. However, I'm struggling to convert my String timestamp

问题 I have an Instant coming from a source that should, according to the spec, be a LocalDate, but don't see any methods in LocalDate for the conversion. What is the best way to do this? 回答1: LocalDate.ofInstant(...); I believe was added in Java 9. LocalDateTime has that method in Java 8. yourInstant.atZone(yourZoneId).toLocalDate(); Will work with earlier versions for LocalDate... 回答2: Other answers provided the mechanics for the transformation, but I wanted to add some background on the meaning

问题 In the Microsoft Spec, DATETIME is represented as 2 32-bit integers: low and high Reference: https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-dtyp/cca27429-5689-4a16-b2b4-9325d93e4ba2 The FILETIME structure is a 64-bit value that represents the number of 100-nanosecond intervals that have elapsed since January 1, 1601, Coordinated Universal Time (UTC). typedef struct _FILETIME { DWORD dwLowDateTime; DWORD dwHighDateTime; } FILETIME, *PFILETIME, *LPFILETIME; dwLowDateTime: A 32

问题 In the Microsoft Spec, DATETIME is represented as 2 32-bit integers: low and high Reference: https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-dtyp/cca27429-5689-4a16-b2b4-9325d93e4ba2 The FILETIME structure is a 64-bit value that represents the number of 100-nanosecond intervals that have elapsed since January 1, 1601, Coordinated Universal Time (UTC). typedef struct _FILETIME { DWORD dwLowDateTime; DWORD dwHighDateTime; } FILETIME, *PFILETIME, *LPFILETIME; dwLowDateTime: A 32

问题 There has been changes in Java Date & Time API Since Java 9. LocalDateTime now has microseconds precision. Java 9 has a fresh implementation of java.time.Clock capable of capturing the current moment in resolution finer than milliseconds (three digits of decimal fraction). We get the time in microseconds from our backend service. System.currentTimeMillis > 1565245051795 > 2019-08-08T06:17:31.795 Service.getTime > 1565245051795306 > 2019-08-08T06:17:31.795306 In order to construct a

问题 I have an instant formatted like this: DateTimeFormatter formatter = DateTimeFormatter.ofLocalizedDateTime(FormatStyle.SHORT ) .withLocale( Locale.UK ) .withZone( ZoneId.of("UTC")); String instant = formatter.format(Instant.now()).toString(); and i want to calculate the days, hours and minutes (if possible) between the instant and Instant.now(), something like: // for days String daysBetween = Instant.now() - instant; can i do that ? 回答1: To calculate days , hours and/or minutes between two

问题 Here is my code which i am using to parse string using Instant.parse , String date = "2018-05-01T00:00:00"; Instant.parse(date) And getting below error java.time.format.DateTimeParseException: Text '2018-05-01T00:00:00' could not be parsed at index 19 at java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:1949) at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1851) at java.time.Instant.parse(Instant.java:395) I cannot use other then Instant so looking

问题 Here is my code which i am using to parse string using Instant.parse , String date = "2018-05-01T00:00:00"; Instant.parse(date) And getting below error java.time.format.DateTimeParseException: Text '2018-05-01T00:00:00' could not be parsed at index 19 at java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:1949) at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1851) at java.time.Instant.parse(Instant.java:395) I cannot use other then Instant so looking

问题 The following piece of code: Instant inFourWeeks = Instant.now().plus(4L, ChronoUnit.WEEKS); Throws an exception: java.time.temporal.UnsupportedTemporalTypeException: Unsupported unit: Weeks Why are weeks unsupported? I understand why months and years are not supported, because their duration in smaller units may vary. But a week has constant duration (7 days) and I can achieve the same by writing: Instant inFourWeeks = Instant.now().plus(4L * 7L, ChronoUnit.DAYS); 回答1: It throws

问题 In Java, we can have many different ways to get the current timestamp, but which one is recommended: Instant.now().toEpochMilli() or System.currentTimeMillis() 回答1: Both are fine. And neither is recommended except for a minority of purposes. What do you need milliseconds since the epoch for? In Java, we can have many different ways to get the current timestamp, For current timestamp just use Instant.now() . No need to convert to milliseconds. Many methods from the first years of Java, also