.withNotBefore(new Date())

		
 public static String token() {

        Calendar calendar = Calendar.getInstance();
//        instance.add(Calendar.SECOND, Config.Api.expired); // 这里是 token 过期时间
        calendar.add(Calendar.DATE, Config.Api.expired);
        try {
            Algorithm algorithm = Algorithm.HMAC256(Config.Api.appSecret);
            String token = JWT.create()
                    .withJWTId(Config.Api.appKey)
                    .withKeyId(Config.Api.appKey)
                    .withIssuer(Config.Api.appId)
                    .withIssuedAt(new Date())
                    .withSubject(Config.Api.subject)
                    .withAudience(Config.Api.audience)
                    .withExpiresAt(calendar.getTime())
                    .withNotBefore(new Date())
                    .sign(algorithm);

            SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            String datetime = formatter.format(calendar.getTime());

            Log.d(TAG, "Calendar：" + datetime + " Token: " + token);
            return token;
        } catch (JWTCreationException exception) {
            Log.d(TAG, exception.getMessage());
        }
        return null;
    }		
		
		

.acceptLeeway(3) 允许时间无差

			
JWTVerifier verifier = JWT.require(algorithm)
                // specify an specific claim validations
                .withIssuer(business.getAppId())
                .withJWTId(business.getAppKey())
                .withSubject(business.getSubject())
                .withAudience(business.getAudience())
                .acceptLeeway(3)
                // reusable verifier instance
                .build();