fix: add compliant dates not in ms, but in seconds. (#206)

src/pollux/models/JWTVerifiableCredential.ts

@@ -320,14 +320,14 @@ export class JWTCredential
     const exp = this.isCredentialPayload(Object.fromEntries(this.properties)) ?
       this.properties.get(JWT_VC_PROPS.exp) :
       this.properties.get(JWT_VP_PROPS.exp);
-    return exp ? new Date(exp).toISOString() : undefined;
+    return exp ? new Date(exp * 1000).toISOString() : undefined;
   }
 
   get issuanceDate() {
     const nbf = this.isCredentialPayload(Object.fromEntries(this.properties)) ?
       this.properties.get(JWT_VC_PROPS.nbf) :
       this.properties.get(JWT_VP_PROPS.nbf);
-    return new Date(nbf).toISOString();
+    return new Date(nbf * 1000).toISOString();
   }
 
   get audience() {

tests/pollux/Pollux.test.ts

@@ -393,10 +393,10 @@ describe("Pollux", () => {
             credential.credentialSubject
           );
           expect(jwtCred.expirationDate).to.be.equal(
-            new Date(jwtPayload[JWTVerifiableCredentialProperties.exp]).toISOString()
+            new Date(jwtPayload[JWTVerifiableCredentialProperties.exp] * 1000).toISOString()
           );
           expect(jwtCred.issuanceDate).to.be.equal(
-            new Date(jwtPayload[JWTVerifiableCredentialProperties.nbf]).toISOString()
+            new Date(jwtPayload[JWTVerifiableCredentialProperties.nbf] * 1000).toISOString()
           );
 
           expect(jwtCred.type).to.be.deep.equal(credential.type);
@@ -428,8 +428,8 @@ describe("Pollux", () => {
           }
         ) as JWTCredential;
 
-        const issuanceDate = new Date(nbf).toISOString();
-        const expirationDate = new Date(exp).toISOString();
+        const issuanceDate = new Date(nbf * 1000).toISOString();
+        const expirationDate = new Date(exp * 1000).toISOString();
 
         expect(result.issuanceDate).to.equal(issuanceDate);
         expect(result.expirationDate).to.equal(expirationDate);