在JAVA中生成特定范围内的随机日期
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Generating random date in a specific range in JAVA
提问by Ashish Kumar
How to generate random dates in a specific range in JAVA? I have seen How do I generate random integers within a specific range in Java?link which is to generate random numbers.Is there similar/other kind of way to generate random date in JAVA?
如何在JAVA中生成特定范围内的随机日期？我已经看到如何在 Java 中生成特定范围内的随机整数？生成随机数的链接。在 JAVA 中是否有类似/其他类型的方法来生成随机日期？
采纳答案by Adrian Shum
Given that your question is unclear, I am expecting you are trying to generate random java.util.Datewith given range.
鉴于您的问题不清楚，我希望您尝试在java.util.Date给定范围内生成随机数。
Please note that java.util.Datecontains date + time information.
请注意，java.util.Date包含日期 + 时间信息。
Datein Java is represented by milliseconds from EPOCH. Therefore the easiest way to do what you want is, given d1 and d2 is Date, and d1 < d2 (in pseudo-code):
Date在 Java 中，以 EPOCH 中的毫秒数表示。因此，做你想做的最简单的方法是，给定 d1 和 d2 是Date，并且 d1 < d2 （在伪代码中）：
Date randomDate = new Date(ThreadLocalRandom.current()
.nextLong(d1.getTime(), d2.getTime()));
If it is actually a "Date" (without time) that you want to produce, which is usually represented by LocalDate(in Java 8+, or using JODA Time).
如果它实际上是您想要生成的“日期”（没有时间），通常由LocalDate（在 Java 8+ 中，或使用 JODA 时间）表示。
It is as easy as, assume d1 and d2 being LocalDate, with d1 < d2(pseudo-code):
它就像假设 d1 和 d2 一样简单LocalDate，使用d1 < d2（伪代码）：
int days = Days.daysBetween(d1, d2).toDays();
LocalDate randomDate = d1.addDays(ThreadLocalRandom.nextInt(days+1));
回答by Saravana
Try this
尝试这个
LocalDate startDate = LocalDate.of(1990, 1, 1); //start date
long start = startDate.toEpochDay();
System.out.println(start);
LocalDate endDate = LocalDate.now(); //end date
long end = endDate.toEpochDay();
System.out.println(start);
long randomEpochDay = ThreadLocalRandom.current().longs(start, end).findAny().getAsLong();
System.out.println(LocalDate.ofEpochDay(randomEpochDay)); // random date between the range
回答by ravthiru
You can do something like this
你可以做这样的事情
long random = ThreadLocalRandom.current().nextLong(startDate.getTime(), endDate.getTime());
Date date = new Date(random);
