java-time

I'm moving from using java.sql.Timestamp and java.util.GregorianCalendar to employ java.time.* new classes in a Spring MVC application. So I changed every private GregorianCalendar field; to private LocalDate field; or private LocalDateTime field; But now when serializing those beans, they get serialized like this: "field": { "year": 1970, "month": "JANUARY", "dayOfMonth": 18, "dayOfWeek": "SUNDAY", "era": "CE", "dayOfYear": 18, "leapYear": false, "monthValue": 1, "chronology": { "id": "ISO", "calendarType": "iso8601" } }, I found answers to other questions that mention to add a dependency to

I need to create the formatter for parsing timestamps with optional milli, micro or nano fractions of second. For example, for my needs I see the following opportunity: DateTimeFormatter formatter = new DateTimeFormatterBuilder() .append(DateTimeFormatter.BASIC_ISO_DATE) .appendLiteral('-') .append(DateTimeFormatter.ISO_LOCAL_TIME) .appendOffset("+HH:mm", "Z") .toFormatter(); Or it is also possible to use appendFraction(field, minWidth, maxWidth, decimalPoint) . However in these cases will it be possible to parse timestamps with any number of decimals (up to 9 or maxWidth). How to achieve that

I have this method to calculate midnigt and current time as long values: /** * Returns the time range between the midnight and current time in milliseconds. * * @param zoneId time zone ID. * @return a {@code long} array, where at index: 0 - midnight time; 1 - current time. */ public static long[] todayDateRange(ZoneId zoneId) { long[] toReturn = new long[2]; LocalTime midnight = LocalTime.MIDNIGHT; LocalDate today = LocalDate.now(zoneId); LocalDateTime todayMidnight = LocalDateTime.of(today, midnight); ZonedDateTime todayMidnightZdt = todayMidnight.atZone(zoneId); toReturn[0] =

Is it possible to create only one static instance of DateTimeFormatter and use it everywhere in my project, instead of creating it multiple times? public static final DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd"); Can there be thread-safety issues in such cases? Yes, it is possible. Your variable is Thread Safe because it is immutable - No other thread can change it. Other solutions are also possible in your specific case, but I am always in favour of immutable objects. See Java Concurrency in practice Chapter 3. By the way, the chapter seems to be free to browse now,

I try to parse a date with this format: ddYYYY . For example, I have the string 141968 , and I want to know that day = 14 and year = 1968 . I suppose I have to use directly a TemporalAccessor gave by DateTimeFormatter.parse(String) , but I cannot find how to use this result. While debugging I see the result is a java.time.Parsed which is not public but contains informations I want in field fieldValues . How can I parse this particular format? Thank you. One approach is to default the missing month field: DateTimeFormatter f = new DateTimeFormatterBuilder() .appendPattern("ddyyyy")

I've been looking for this for a while, with no success so far. Do you know if there's a "DateFormat" ish class, that will allow me to use "00:00:00" and "24:00:00" as input parameters (they're both midnight) but when called "getHour()" I'll get 0 or 24 as a result? Using "kk" will only allow me to have <1:24> range, meanwhile I'm looking for <0:24> range formatting The value 24:00 is not represented in a LocalTime because it is strictly part of the next day. Consideration was given to models where 24:00 could be represented as part of LocalTime , but the conclusion was that it would be very

How can I calculate the Modified Julian day from a JSR-310 class such as LocalDate ? (in JDK 8) Specifically, this is the calculation of the continuous count of days known as "Modified Julian day", not the date in the Julian calendar system . For example: LocalDate date = LocalDate.now(); long modifiedJulianDay = ??? Short answer: LocalDate date = LocalDate.now(); long modifiedJulianDay = date.getLong(JulianFields.MODIFIED_JULIAN_DAY); Explanation: The Wikipedia article gives the best description of Julian day as a concept. Put simply, it is a simple, continuous, count of days from some epoch,

i want to replace JodaTime by Java 8 DateTime API . I've got ISO-8601 period described = P2W5DT11H8M In JodaTime i parse it very simply by executing the following code: Period.parse("P2W5DT11H8M") and i get the successful Period object. Can i do the same in Java 8? A Period in Java 8 only has year/month/day components. A Duration has hour/minute/second components. It seems that you will need to parse the string manually. One option could look like the code below (you need to add input validation etc.) - there may be better alternatives. public static void main(String[] args) { System.out

Before Java 8 the common method was the Calendar API: Calendar cal = Calendar.getInstance(); int hour = cal.get(Calendar.HOUR_OF_DAY); How can I get the current hour, but using the new Date-Time API provided in Java 8 ? This all depends, but something like... LocalTime now = LocalTime.now(); System.out.println(now.getHour()); Should work just fine... Take a closer look at LocalTime#getHour for more details 来源： https://stackoverflow.com/questions/25539891/how-to-get-the-current-hour-with-new-date-time-api-in-java-8

I need to parse a string into a LocalDate . The string looks like 31.* 03 2016 in regex terms (i.e. .* means that there may be 0 or more unknown characters after the day number). Example input/output: 31xy 03 2016 ==> 2016-03-31 I was hoping to find a wildcard syntax in the DateTimeFormatter documentation to allow a pattern such as: LocalDate.parse("31xy 03 2016", DateTimeFormatter.ofPattern("dd[.*] MM yyyy")); but I could not find anything. Is there a simple way to express optional unknown characters with a DateTimeFormatter ? ps: I can obviously modify the string before parsing it but that's