Android:获取两个时区的时间差，单位为秒

import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

public class TimezoneUtil {
    public static int getTimezoneOffsetInSeconds(String timezone1, String timezone2) {
        Calendar calendar1 = Calendar.getInstance(TimeZone.getTimeZone(timezone1));
        Calendar calendar2 = Calendar.getInstance(TimeZone.getTimeZone(timezone2));

        Date date1 = calendar1.getTime();
        Date date2 = calendar2.getTime();

        long diffInMillis = date2.getTime() - date1.getTime();
        int diffInSeconds = (int) (diffInMillis / 1000);

        return diffInSeconds;
    }
}

String timezone1 = "Asia/Shanghai";
String timezone2 = "America/New_York";

int offsetInSeconds = TimezoneUtil.getTimezoneOffsetInSeconds(timezone1, timezone2);
System.out.println("时间差：" + offsetInSeconds + "秒");