EN
Java convert string date time to epoch timestamp
3 points
Quick solution:
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import java.time.LocalDateTime;2
import java.time.ZoneId;3
import java.time.ZonedDateTime;4
import java.time.format.DateTimeFormatter;5
6
public class EpochToDateTimeExample {7
8
public static void main(String[] args) {9
10
String dateText = "2021-05-13 11:59:00.000";11
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ZonedDateTime zonedDateTime = LocalDateTime.parse(13
dateText,14
DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS")15
).atZone(ZoneId.of("UTC"));16
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long epochMilli = zonedDateTime.toInstant().toEpochMilli();18
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System.out.println(epochMilli); // 162090714000020
}21
}Based on above example we can build simple util:
xxxxxxxxxx1
import java.time.LocalDateTime;2
import java.time.ZoneId;3
import java.time.ZonedDateTime;4
import java.time.format.DateTimeFormatter;5
6
public class EpochToDateTimeUtil {7
8
public static long getEpochFromDate(String dateText) {9
ZonedDateTime zonedDateTime = LocalDateTime.parse(10
dateText,11
DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS")12
).atZone(ZoneId.of("UTC"));13
14
return zonedDateTime.toInstant().toEpochMilli();15
}16
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public static void main(String[] args) {18
System.out.println(19
getEpochFromDate("2021-05-13 00:00:00.000")); // 162086400000020
21
System.out.println(22
getEpochFromDate("2021-05-13 11:59:00.000")); // 162090714000023
}24
}xxxxxxxxxx1
ZoneId.of("UTC") // UTC (UTC+00:00)2
ZoneId.of("Europe/Paris") // Europe/Paris (UTC+02:00)In java there is lack of an enum and we need to pass the String to the ZoneId.of("") method.
