是否有回历日期可以转换为格鲁吉亚日期转换，反之亦然？ [英] Is there a Hijri Date to Georgian Date Conv and vice versa, which is reliable?
问题描述
我正在寻找一个可以为我提供所需工具的图书馆，以计算从现在起到特定日期的天数，并可以用来确定我是否处于特定时间段（例如。Muharram +-5days
I am looking for a Library that can give me the needed tools, to calculate for example how many days it is from now, to a specific Date AND that I can use to determine whether I am in a specific time period (eg. Muharram +- 5days) or not
我一直在寻找10个小时以上，而我发现的最好的东西是 HijrahDate库 java.time.chrono .HijrahDate和一个叫 Joda Date的东西，我很难用。
I have been looking for over 10hours now, and the best things I found were the "HijrahDate" library "java.time.chrono.HijrahDate" and something called "Joda Date", which I had difficulties to use.
如果有人可以帮助我，将不胜感激。
If anyone can help me with that, it would be much appreciated.
推荐答案
您要使用哪种回历日历？
如果您选择沙特阿拉伯的官方日历，则基于 java.time.HijrahDate 可以工作。但是此类至少需要Android上的API级别26。示例：
If you opt for the official calendar of Saudi-Arabia then the solution based on java.time.HijrahDate would work. But this class requires at least API level 26 on Android. Example:
HijrahDate hd1 = HijrahDate.now();
HijrahDate hd2 = HijrahDate.from(LocalDate.of(2020, 5, 1));
long days = ChronoUnit.DAYS.between(hd1, hd2);
还有比较方法，例如 isAfter（）或 isBefore（）从接口 ChronoLocalDate 和标准plus（）方法继承来确定您的日期
There are also comparison methods like isAfter() or isBefore() inherited from the interface ChronoLocalDate and standard plus()-methods in order to determine if your date is in a specific time period.
java.time 的后台：
Backport of java.time:
还有一个名为 HijrahDate 的实现是不同的，并且不使用沙特阿拉伯的日历（因此您必须容忍日期转换中的差异）。
There is also a backport called ThreetenABP for lower Android-versions. But be aware of the pitfall that its implementation of HijrahDate is different and does NOT use the calendar of Saudi-Arabia (so you have to tolerate differences in date conversion).
关于Joda-Time：
如果您选择该（相当陈旧）的库那么您应该选择适用于android 的库版本。但是，它也不支持沙特阿拉伯的日历，但提供了其他四个不同的版本。您需要指定算法 leap年模式。
If you opt for that (rather outdated) library then you should choose the library version adapted for android. However, it does not support the calendar of Saudi-Arabia, too, but offers four different other variations. You would need to specify the algorithmic leap year pattern.
ICU4J（嵌入Android）：
其类 IslamicCalendar 提供的样式类似于<$的旧日历类c $ c> java.util.Calendar 以及包括沙特阿拉伯在内的多个变体。最低要求的API级别为24。
Its class IslamicCalendar offers a style similar to old calendar classes java.util.Calendar and also several variants including that of Saudi-Arabia. The minimum required API level is 24.
Time4A：
由我自己编写的库（如适用于Android的Time4J的适配）。它提供了 HijriCalendar 类，其中包括Joda-变体，但还包括沙特阿拉伯的日历（变体ummalqura）。它提供了所有必需的功能，例如日期算术（通过plus（）-或minus（）-方法），日期比较（通过isAfter（）等）。示例：
That is a library written by myself (as adaptation of Time4J for Android). It offers the class HijriCalendar with several variations including the Joda-variants but also including the calendar of Saudi-Arabia (variant ummalqura). It offers all needed features like date arithmetic (by plus()- or minus()-method), date comparison (by isAfter() etc.). Example:
String variant = HijriCalendar.VARIANT_UMALQURA;
StartOfDay startOfDay = StartOfDay.definedBy(SolarTime.ofMecca().sunset());
HijriCalendar today = HijriCalendar.nowInSystemTime(variant, startOfDay);
HijriCalendar hcal = // gregorian to Hijri conversion
PlainDate.of(2020, 5, 1).transform(HijriCalendar.class, variant);
long days = CalendarDays.between(today, hcal).getAmount();
其他图书馆不支持诸如日落之类的功能。您的穆哈拉姆语（Muharram）示例-5天请求可能类似于：
Features like sunset as start of day are not supported by other libraries. Example for your Muharram +- 5days-request might look like:
CalendarDays tolerance = CalendarDays.of(5);
HijriCalendar htemp = today.with(HijriCalendar.MONTH_OF_YEAR, HijriMonth.MUHARRAM);
HijriCalendar h1 = htemp.with(HijriCalendar.DAY_OF_MONTH.minimized()).minus(tolerance);
HijriCalendar h2 = htemp.with(HijriCalendar.DAY_OF_MONTH.maximized()).plus(tolerance);
boolean inTimePeriod = !(today.isBefore(h1) || today.isAfter(h2));
这篇关于是否有回历日期可以转换为格鲁吉亚日期转换，反之亦然？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IT屋！
