UnixTimeConverter.java

import java.util.Calendar;
import java.text.SimpleDateFormat;

public class UnixTimeConverter {
	public String conv(String utime) {
		String retstr = "";

		try {
			Calendar cal = Calendar.getInstance();
			cal.setTimeInMillis(Long.parseLong(utime) * 1000L);
			retstr = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss z").format(cal.getTime());
		} catch (NumberFormatException e) {
			retstr = "<error...>";
		}

		return retstr;
	}

	public static void main(String[] args) {
		UnixTimeConverter obj = new UnixTimeConverter();

		if (args.length>0) {
			for (String arg : args) {
				System.out.println(obj.conv(arg));
			}
		} else {
			System.out.println("<no input...>");
		}
	}
}