验证字符串是一个合法的时间

public static Boolean isTimeStr(String validateDate, String format) {
    boolean flag = false;
    try {
        DateUtil.parse(validateDate, format);
        flag = true;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return flag;
}

public static Boolean isTimeStr(String validateDate) {
    boolean flag = false;
    try {
        DateUtil.parse(validateDate, "yyyy-MM-dd HH:mm:ss");
        flag = true;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return flag;
}