java 本地时间与UTC时间转换

在对接接口时发现对方使用的是UTC时间，而我采用的是北京时间（GMT+08），于是写了一个格式转换的工具类

时间格式转换工具类

public class DateLocalUtcUtil {

	public static String localToUTC(String localTimeStr) {
		try {
			Date localDate = getLocalSDF().parse(localTimeStr);
			return getUTCSDF().format(localDate);
		} catch (ParseException e) {
			e.printStackTrace();
		}

		return null;
	}

	public static String utcToLocal(String utcTimeStr) {
		try {
			Date date = getUTCSDF().parse(utcTimeStr);
			return getLocalSDF().format(date);
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return null;
	}

	private static SimpleDateFormat getLocalSDF() {
		return new SimpleDateFormat(DateFormatConstant.DATE_TIME_FROMAT);
	}

	private static SimpleDateFormat getUTCSDF() {
		SimpleDateFormat utcSDF = new SimpleDateFormat(DateFormatConstant.ISO_DATE_TIME_FORMAT);
		utcSDF.setTimeZone(TimeZone.getTimeZone("UTC"));
		return utcSDF;
	}
}

测试代码

public class Test01 {

	public static void main(String[] args) throws ParseException {

		String dataStr = "2020-12-07 15:43:03.987";
		String isoDataStr = "2020-12-07T07:43:03.987Z";

		String utcDateStr = DateLocalUtcUtil.localToUTC(dataStr);
		System.out.println(utcDateStr );

		String localDateStr = DateLocalUtcUtil.utcToLocal(isoDataStr);
		System.out.println(localDateStr);

	}

}

结果

2020-12-07T07:43:03.000Z
2020-12-07 15:43:03.987