java - Java 中的 "How to format LocalDate with Custom Pattern"

Question

我是 JodaTime 的新手，正在自己学习。实际上我想要的只是以我自己的格式格式化 LocateDate 。我的格式是 "dd-mm-yyyy"

我有计算两个日期差异的方法:

private void sampleDaysDifference() {
    DateTime todayDate = getLocalTodayDate();
    DateTime dateAfterTwoDays = getDateAfterTwoDays();

    //get the days difference
    int differenceOfDates = Days.daysBetween(todayDate, dateAfterTwoDays).getDays();
    Log.e("logX","differenceOfDates: " + differenceOfDates);

}

要获取我正在使用的今天日期:

private DateTime getLocalTodayDate() {
    LocalDate now = LocalDate.now();
    DateTimeFormatter fmt = DateTimeFormat.forPattern(DATE_FORMAT);
    return fmt.parseDateTime(now.toString());//return the today date
}

并获取两天后的日期:

private DateTime getDateAfterTwoDays() {
    LocalDate now = LocalDate.now();
    DateTimeFormatter fmt = DateTimeFormat.forPattern(DATE_FORMAT);
    return fmt.parseDateTime(now.plusDays(2).toString());//return date after two days
}

问题是我不知道如何使用 JodaTime 格式化日期，有人可以告诉我如何格式化 JodaTime LocalDate!

实际上，我的应用程序因堆栈跟踪而崩溃:

  Caused by: java.lang.IllegalArgumentException: Invalid format: "16 January, 2019" is malformed at " January, 2019"

Answer 1

您即将完成，但只是您指定的模式错误，请将 "dd-mm-yyyy" 更改为 "dd-MM-yyyy" docs-for-patterns

简单示例

System.out.println(LocalDate.now().format(DateTimeFormatter.ofPattern("dd-MM-yyyy")));   //16-01-2019

来自 Joda DateTimeFormatter joda-docs

模式语法大部分与 java.text.SimpleDateFormat 兼容