localdate

问题 I want to use java.time.LocalDate and java.time.LocalDateTime with an implicit Ordered like: val date1 = java.time.LocalDate.of(2000, 1, 1) val date2 = java.time.LocalDate.of(2010, 10, 10) if (date1 < date2) ... import scala.math.Ordering.Implicits._ doesn't work, because LocalDate inherits from Comparable<ChronoLocalDate> instead of Comparable<LocalDate> . How can I write my own imlicit Orderd to use <, <=, >, >= operators/methods to compare LocalDate 's? Edit: I found a way with use of an

问题 I want to use java.time.LocalDate and java.time.LocalDateTime with an implicit Ordered like: val date1 = java.time.LocalDate.of(2000, 1, 1) val date2 = java.time.LocalDate.of(2010, 10, 10) if (date1 < date2) ... import scala.math.Ordering.Implicits._ doesn't work, because LocalDate inherits from Comparable<ChronoLocalDate> instead of Comparable<LocalDate> . How can I write my own imlicit Orderd to use <, <=, >, >= operators/methods to compare LocalDate 's? Edit: I found a way with use of an

问题 I am new in Mapstruct. I have a model object which includes LocalDateTime type field. DTO includes Instant type field. I want to map LocalDateTime type field to Instant type field. I have TimeZone instance of incoming requests. Manually field setting like that; set( LocalDateTime.ofInstant(x.getStartDate(), timeZone.toZoneId()) ) How can I map these fields using with Mapstruct? 回答1: You have 2 options to achieve what you are looking for. First option: Use the new @Context annotation from 1.2

问题 Given LocalDate I want to convert to week number since Epoch One way to do that is: LocalDate date = datePicker.getValue(); // input from your date picker Locale locale = Locale.US; int weekOfYear = date.get(WeekFields.of(locale).weekOfWeekBasedYear()); And X = find weeks since Epoch to prevYear And then result = X + weekOfYear Although someway we can find out "week number since epoch", is there clean solution to find it using Java 8 ? UPDATE: Even above solution wont work as one week(always

问题 With Joda library, you can do DateTimeFormat.forPattern("yyyy").parseLocalDate("2008") that creates a LocalDate at Jan 1st, 2008 With Java8, you can try to do LocalDate.parse("2008",DateTimeFormatter.ofPattern("yyyy")) but that fails to parse: Text '2008' could not be parsed: Unable to obtain LocalDate from TemporalAccessor: {Year=2008},ISO of type java.time.format.Parsed Is there any alternative, instead of specifically writing sth like LocalDate.ofYearDay(Integer.valueOf("2008"), 1) ? 回答1:

问题 I'm trying to insert objects of type Book into a database, and one of the columns is specified as date, but according to this exception: Caused by: org.postgresql.util.PSQLException: ERROR: column "publish_date" is of type date but expression is of type bytea Hint: You will need to rewrite or cast the expression. Position: 94 at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2412) at org.postgresql.core.v3.QueryExecutorImpl.processResults

问题 I'm trying to insert objects of type Book into a database, and one of the columns is specified as date, but according to this exception: Caused by: org.postgresql.util.PSQLException: ERROR: column "publish_date" is of type date but expression is of type bytea Hint: You will need to rewrite or cast the expression. Position: 94 at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2412) at org.postgresql.core.v3.QueryExecutorImpl.processResults

问题 I'm trying to insert objects of type Book into a database, and one of the columns is specified as date, but according to this exception: Caused by: org.postgresql.util.PSQLException: ERROR: column "publish_date" is of type date but expression is of type bytea Hint: You will need to rewrite or cast the expression. Position: 94 at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2412) at org.postgresql.core.v3.QueryExecutorImpl.processResults

问题 I am using LocalDateTime in my model, after including LocalDateTimeDeserializer, converted the bean field to @NotNull @Column(name = "created") @JsonDeserialize(using = LocalDateTimeDeserializer.class) private LocalDateTime created; and included the spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS = false property in the SpringBoot's application.properties file, the application is finally able to deserialize the JSON and show properly like, "created": "2018-04-22T21:21:53.025", But,

问题 i tired using java.time.Period , and the results were different from my manual calculations by three days. The weird thing here is when i divide the period into two periods , the results matches my manual calculations. the second method is just like how i calculate the period manually. is there something i missed ? is there a standard method or algorithm of calendar arithmetic ? and what's the algorithm used by java.time.Period ? import java.time.LocalDate; import java.time.Period; import