Update compareTime arguments.

lib/index.js

@@ -648,15 +648,15 @@ export function _checkCredential({
       if(mode === 'verify') {
         // check if `now` is after `expirationDate`
         const expirationDate = new Date(credential.expirationDate);
-        if(compareTime({t1: expirationDate, t2: now, maxClockSkew}) > 0) {
+        if(compareTime({t1: now, t2: expirationDate, maxClockSkew}) > 0) {
           throw new Error('Credential has expired.');
         }
       }
     }
     // check if `now` is before `issuanceDate` on verification
     if(mode === 'verify') {
       const issuanceDate = new Date(credential.issuanceDate);
-      if(compareTime({t1: now, t2: issuanceDate, maxClockSkew}) > 0) {
+      if(compareTime({t1: issuanceDate, t2: now, maxClockSkew}) > 0) {
         throw new Error(
           `The current date time (${now.toISOString()}) is before the ` +
           `"issuanceDate" (${credential.issuanceDate}).`);
@@ -670,7 +670,7 @@ export function _checkCredential({
       assertDateString({credential, prop: 'validUntil'});
       if(mode === 'verify') {
         validUntil = new Date(credential.validUntil);
-        if(compareTime({t1: validUntil, t2: now, maxClockSkew}) > 0) {
+        if(compareTime({t1: now, t2: validUntil, maxClockSkew}) > 0) {
           throw new Error(
             `The current date time (${now.toISOString()}) is after ` +
             `"validUntil" (${credential.validUntil}).`);
@@ -682,7 +682,7 @@ export function _checkCredential({
       if(mode === 'verify') {
       // check if `now` is before `validFrom`
         validFrom = new Date(credential.validFrom);
-        if(compareTime({t1: now, t2: validFrom, maxClockSkew}) > 0) {
+        if(compareTime({t1: validFrom, t2: now, maxClockSkew}) > 0) {
           throw new Error(
             `The current date time (${now.toISOString()}) is before ` +
             `"validFrom" (${credential.validFrom}).`);