java-time

Below I have 3 methods. The first is very simple. It just counts the total number of days. The second, however, will not only count the days, but will ignore the days of the week that are passed in to the method. My problem is that the third method is not always correct. It should match the second method. I am guessing it has something to do with leap years, because the difference is usually +=3|4 when it is incorrect. Additional Info I am attempting to mock Excel's weekday(serial_number,[return_type]) formula in a way. serial_number = startDate:Date - daysOfWeekToInclude:Array<Integer>

I was playing with the new date time API but when running this: public class Test { public static void main(String[] args){ String dateFormatted = LocalDate.now() .format(DateTimeFormatter .ofPattern("yyyy-MM-dd HH:mm:ss")); System.out.println(dateFormatted); } } It throws: Exception in thread "main" java.time.temporal.UnsupportedTemporalTypeException: Unsupported field: HourOfDay at java.time.LocalDate.get0(LocalDate.java:680) at java.time.LocalDate.getLong(LocalDate.java:659) at java.time.format.DateTimePrintContext.getValue(DateTimePrintContext.java:298) at java.time.format

I'm a bit discouraged with parsing dates in Java 8 Time API . Previously I could easily write: String date = "04.2013"; DateFormat df = new SimpleDateFormat("MM.yyyy"); Date d = df.parse(date); But now if I use LocalDate and do it like this: String date = "04.2013"; DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MM.yyyy"); LocalDate ld = LocalDate.parse(date, formatter); I receive an exception: java.time.format.DateTimeParseException: Text '04' could not be parsed at index 0 java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:1948) java.time.format

I was just migrating a module from the old java dates to the new java.time API, and noticed a huge drop in performance. It boiled down to parsing of dates with timezone (I parse millions of them at a time). Parsing of date string without a time zone ( yyyy/MM/dd HH:mm:ss ) is fast - about 2 times faster than with the old java date, about 1.5M operations per second on my PC. However, when the pattern contains a time zone ( yyyy/MM/dd HH:mm:ss z ), the performance drops about 15 times with the new java.time API, while with the old API it is about as fast as without a time zone. See the

I use Spring Boot and included jackson-datatype-jsr310 with Maven: <dependency> <groupId>com.fasterxml.jackson.datatype</groupId> <artifactId>jackson-datatype-jsr310</artifactId> <version>2.7.3</version> </dependency> When I try to use a RequestParam with a Java 8 Date/Time type, @GetMapping("/test") public Page<User> get( @RequestParam(value = "start", required = false) @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME) LocalDateTime start) { //... } and test it with this URL: /test?start=2016-10-8T00:00 I get the following error: { "timestamp": 1477528408379, "status": 400, "error": "Bad