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This PR is related to BAEL-7181 (#15192) 

* This commit is related to BAEL-7181

This commit aims to add a class "TimestampToLong.java" that provides several approaches to convert timestamp string into long.

* This commit is related to BAEL-7181

This commit aims to add a test class "TimestampToLongUnitTest.java" that provides several approaches to convert timestamp string into long.
This commit is contained in:
MohamedHelmyKassab 2023-11-14 07:53:16 +02:00 committed by GitHub
parent 8532499dcc
commit c5af2f3f3b
2 changed files with 84 additions and 0 deletions
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32
core-java-modules/core-java-datetime-conversion/src/main/java/com/baeldung/timestamptolong/TimestampToLong.java Normal file
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package com.baeldung.timestamptolong;
import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Date;
public class TimestampToLong {
public void usingSimpleDateFormat() throws ParseException {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String currentDateString = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
long actualTimestamp = sdf.parse(currentDateString).getTime();
}
public void usingInstantClass() {
Instant instant = Instant.now();
long actualTimestamp = instant.toEpochMilli();
}
public void usingTimestamp() {
Timestamp timestamp = new Timestamp(System.currentTimeMillis());
long actualTimestamp = timestamp.getTime();
}
public void usingJava8DateTime() {
LocalDateTime localDateTime = LocalDateTime.now();
long actualTimestamp = localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
}
}

52
core-java-modules/core-java-datetime-conversion/src/test/java/com/baeldung/timestamptolong/TimestampToLongUnitTest.java Normal file
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package com.baeldung.timestamptolong;
import org.junit.Test;
import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Date;
import static org.junit.Assert.assertTrue;
public class TimestampToLongUnitTest {
private static final long TOLERANCE = 1000;
@Test
public void givenSimpleDateFormat_whenFormattingDate_thenTConvertToLong() throws ParseException {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String currentDateString = sdf.format(new Date());
long actualTimestamp = sdf.parse(currentDateString).getTime();
assertTrue(Math.abs(System.currentTimeMillis() - actualTimestamp) < TOLERANCE);
}
@Test
public void givenInstantClass_whenGettingTimestamp_thenTConvertToLong() {
Instant instant = Instant.now();
long actualTimestamp = instant.toEpochMilli();
assertTrue(Math.abs(System.currentTimeMillis() - actualTimestamp) < TOLERANCE);
}
@Test
public void givenTimestamp_whenCreatingTimestamp_thenTConvertToLong() {
Timestamp timestamp = new Timestamp(System.currentTimeMillis());
long actualTimestamp = timestamp.getTime();
assertTrue(Math.abs(System.currentTimeMillis() - actualTimestamp) < TOLERANCE);
}
@Test
public void givenJava8DateTime_whenGettingTimestamp_thenTConvertToLong() {
LocalDateTime localDateTime = LocalDateTime.now();
long actualTimestamp = localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
assertTrue(Math.abs(System.currentTimeMillis() - actualTimestamp) < TOLERANCE);
}
}