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.
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package com.baeldung.timestamptolong;
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import java.sql.Timestamp;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.time.Instant;
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import java.time.LocalDateTime;
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import java.time.ZoneId;
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import java.util.Date;
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public class TimestampToLong {
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public void usingSimpleDateFormat() throws ParseException {
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SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
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String currentDateString = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
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long actualTimestamp = sdf.parse(currentDateString).getTime();
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}
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public void usingInstantClass() {
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Instant instant = Instant.now();
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long actualTimestamp = instant.toEpochMilli();
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}
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public void usingTimestamp() {
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Timestamp timestamp = new Timestamp(System.currentTimeMillis());
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long actualTimestamp = timestamp.getTime();
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}
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public void usingJava8DateTime() {
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LocalDateTime localDateTime = LocalDateTime.now();
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long actualTimestamp = localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
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}
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}
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package com.baeldung.timestamptolong;
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import org.junit.Test;
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import java.sql.Timestamp;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.time.Instant;
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import java.time.LocalDateTime;
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import java.time.ZoneId;
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import java.util.Date;
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import static org.junit.Assert.assertTrue;
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public class TimestampToLongUnitTest {
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private static final long TOLERANCE = 1000;
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@Test
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public void givenSimpleDateFormat_whenFormattingDate_thenTConvertToLong() throws ParseException {
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SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
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String currentDateString = sdf.format(new Date());
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long actualTimestamp = sdf.parse(currentDateString).getTime();
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assertTrue(Math.abs(System.currentTimeMillis() - actualTimestamp) < TOLERANCE);
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}
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@Test
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public void givenInstantClass_whenGettingTimestamp_thenTConvertToLong() {
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Instant instant = Instant.now();
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long actualTimestamp = instant.toEpochMilli();
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assertTrue(Math.abs(System.currentTimeMillis() - actualTimestamp) < TOLERANCE);
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}
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@Test
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public void givenTimestamp_whenCreatingTimestamp_thenTConvertToLong() {
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Timestamp timestamp = new Timestamp(System.currentTimeMillis());
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long actualTimestamp = timestamp.getTime();
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assertTrue(Math.abs(System.currentTimeMillis() - actualTimestamp) < TOLERANCE);
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}
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@Test
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public void givenJava8DateTime_whenGettingTimestamp_thenTConvertToLong() {
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LocalDateTime localDateTime = LocalDateTime.now();
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long actualTimestamp = localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
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assertTrue(Math.abs(System.currentTimeMillis() - actualTimestamp) < TOLERANCE);
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}
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}
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