在Java中计算linux的时代属于哪一天[重复]

Question

// some code here that I need.... <---??

// The time set here below is (Tue 2019-09-10 14:05:00 UTC)
final long timestamp = 1568124300000L


if (timestamp = xxxxx) {
    System.out.println("The day it belongs to is: " + dayEpoch);
}

Answer 1

您可以使用java.time来满足您的需求：

第一个选项（首选）:offsetdatetime

final long timestamp = 1568124300000L;

// create an Instant from the timestamp
Instant instant = Instant.ofEpochMilli(timestamp);
// create a datetime object from the Instant
OffsetDateTime offsetDateTime = OffsetDateTime.ofInstant(instant, ZoneId.of("UTC"));
// print it in your desired formatting
System.out.println("The day it belongs to is: "
                    + offsetDateTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd")));

第二个选项（有效，但不太合适）:ZonedDateTime

final long timestamp = 1568124300000L;

// create an Instant from the timestamp
Instant instant = Instant.ofEpochMilli(timestamp);
// create a datetime object from the Instant
ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(instant, ZoneId.of("UTC"));
// print it in your desired formatting
System.out.println("The day it belongs to is: "
                    + zonedDateTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd")));