common.utils.GetUTCTimeUtil Maven / Gradle / Ivy

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package common.utils;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * @Classname GetUTCTimeUtil
 * @Description 获取utc时间
 */
public class GetUTCTimeUtil {

    private static DateFormat utcFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");

    /**
     * 得到UTC时间，类型为字符串，格式为"yyyy-MM-dd HH:mm"

     * 如果获取失败，返回null
     *
     * @return
     */
    public static String getUTCTimeStr(){
        StringBuffer UTCTimeBuffer = new StringBuffer();
        // 1、取得本地时间：
        Calendar cal = Calendar.getInstance();
        // 2、取得时间偏移量：
        int zoneOffset = cal.get(java.util.Calendar.ZONE_OFFSET);
        // 3、取得夏令时差：
        int dstOffset = cal.get(java.util.Calendar.DST_OFFSET);
        // 4、从本地时间里扣除这些差量，即可以取得UTC时间：
        cal.add(java.util.Calendar.MILLISECOND, -(zoneOffset + dstOffset));
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH) + 1;
        int day = cal.get(Calendar.DAY_OF_MONTH);
        int hour = cal.get(Calendar.HOUR_OF_DAY);
        int minute = cal.get(Calendar.MINUTE);
        int second = cal.get(Calendar.SECOND);
        UTCTimeBuffer.append(year).append("-").append(month).append("-").append(day);
        UTCTimeBuffer.append("T").append(hour).append(":").append(minute).append(":").append(second).append("Z");
        Date utcDate = null;
        try {
            utcDate = utcFormat.parse(UTCTimeBuffer.toString());
        } catch (ParseException e) {
            e.printStackTrace();
        }
        String utcDateStr = utcFormat.format(utcDate);
        return utcDateStr;
    }
}