Conversion From 12 Hours Time to 24 Hours Time in Java (#14580)
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package com.baeldung.twelvehourstotwentyhours;
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import static org.junit.jupiter.api.Assertions.*;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.time.LocalTime;
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import java.time.format.DateTimeFormatter;
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import java.util.Date;
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import java.util.Locale;
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import org.junit.jupiter.api.Test;
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public class TimeConversionUnitTest {
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@Test
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public void givenTimeInTwelveHours_whenConvertingToTwentyHours_thenConverted() throws ParseException {
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SimpleDateFormat displayFormat = new SimpleDateFormat("HH:mm");
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SimpleDateFormat parseFormat = new SimpleDateFormat("hh:mm a");
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Date date = parseFormat.parse("06:00 PM");
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assertEquals("18:00", displayFormat.format(date));
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}
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@Test
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public void givenTimeInTwelveHours_whenConvertingToTwentyHoursWithDateTimeFormatter_thenConverted() throws ParseException {
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String time = LocalTime.parse("06:00 PM", DateTimeFormatter.ofPattern("hh:mm a", Locale.US))
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.format(DateTimeFormatter.ofPattern("HH:mm"));
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assertEquals("18:00", time);
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}
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}
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