问题描述
有没有一种方法可以自动完成YYYY-MM-DD格式的日期，而输入字段只需要MM-DD.
Is there a way to auto complete a date in YYYY-MM-DD format where the input field would only require MM-DD.
除非月份和日期是过去的日期，否则年份将是当前年份.
The year would be the current year unless the month and day were in the past.
示例:
输入"06-28"将输出2017-06-28
Input of "06-28" would output 2017-06-28
如果日期是过去的时间，
and if the date was in the past,
输入"04-30"输出2018-04-30
Input "04-30" output 2018-04-30
代码将以HTML或Java编写
The code would be written in HTML or Java
感谢您的帮助，如果我错过了某些事情，我们深表歉意.
Thanks for the help and sorry if I am missing something.
推荐答案
这是 java.time 类很出色.
This is where the java.time classes excel.
public static LocalDate autocomplete(String mmdd) {
ZoneId clientTimeZone = ZoneId.systemDefault();
LocalDate today = LocalDate.now(clientTimeZone);
MonthDay md = MonthDay.parse(mmdd, DateTimeFormatter.ofPattern("MM-dd"));
Year y = Year.from(today);
if (md.isBefore(MonthDay.from(today))) {
// in the past; use next year
y = y.plusYears(1);
}
return y.atMonthDay(md);
}
请注意对时区的依赖性.请三思而后行，应该使用哪个区域.
Please note the dependency on time zone. Think twice about which zone you should use.
如果需要将结果作为String，只需使用toString().
If you need the result as a String, just use toString().
正确的情况:该方法将接受02-29作为有效输入，并且如果所选的年份不是a年，则该方法将自动完成到2月28日.除非明年二月有29天，否则您可能需要对其进行修改以拒绝02-29.
Corner case: The method will accept 02-29 as valid input and will autocomplete into a date of February 28 if the chosen year is not a leap year. You may want to modify it to reject 02-29 unless next February has 29 days.
这篇关于MM-DD输入中的Java自动完成/格式化日期的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！