Java 8 LocalDate 从 long 到 date 转换不正确

Question

我想将以毫秒为单位的日期转换为日期，但转换不正确。

public static void main(String[] args) {        
    LocalDate today = LocalDateTime.now().toLocalDate();
    System.out.println("Today: ----------" + today);
    long todayLong = today.atStartOfDay(ZoneId.systemDefault()).toEpochSecond();
    System.out.println("todayLong: ---------- " + todayLong);
    LocalDate todayBack = Instant.ofEpochMilli(todayLong).atZone(ZoneId.systemDefault()).toLocalDate();
    System.out.println("todayBack: ---------- "+todayBack);
}

这是输出：

Today: ----------2017-06-27

todayLong: ---------- 1498507200

todayBack: ---------- 1970-01-18

Answer 1

你必须将 todayLong 乘以 1000

LocalDate todayBack = Instant.ofEpochMilli(todayLong * 1000).atZone(ZoneId.systemDefault()).toLocalDate();

System.out.println("todayBack: ---------- " + todayBack);

获取输出：

Today: ----------2017-06-27

todayLong: ---------- 1498514400

todayBack: ---------- 2017-06-27

Answer 2

您需要使用 ofEpochSecond 而不是 ofEpochMilli 因为您的 todayLong 是 second，而不是 milisecond

LocalDate todayBack = Instant.ofEpochSecond(todayLong).atZone(ZoneId.systemDefault()).toLocalDate();

Answer 3

你在第6行有一点错误(Instant.ofEpochMilli)。使用 Instant.ofEpochSecond 代替：

LocalDate today = LocalDateTime.now().toLocalDate();
System.out.println("Today: ----------" + today);
long todayLong = today.atStartOfDay(ZoneId.systemDefault()).toEpochSecond();
System.out.println("todayLong: ---------- " + todayLong);
LocalDate todayBack = Instant.ofEpochSecond(todayLong).atZone(ZoneId.systemDefault()).toLocalDate();
System.out.println("todayBack: ---------- " + todayBack);

Java 8 LocalDate 从 long 到 date 转换不正确

Java 8 LocalDate from long to date not converted correct

java

date

zoneddatetime

localdate