support both seconds & milliseconds timestamp

src/user/message.ts

@@ -587,6 +587,7 @@ export class Message extends Accessory implements Sayable {
    */
 
   public async recall (): Promise<boolean> {
+    log.verbose('Message', 'recall()')
     const isSuccess = await this.puppet.messageRecall(this.id)
     return isSuccess
   }
@@ -915,9 +916,24 @@ export class Message extends Accessory implements Sayable {
       throw new Error('no payload')
     }
 
-    // convert the unit timestamp to milliseconds
-    // (from seconds to milliseconds)
-    return new Date(1000 * this.payload.timestamp)
+    /**
+      * Huan(202001): support both seconds & milliseconds
+      *
+      * How to test if a given time-stamp is in seconds or milliseconds?
+      * https://stackoverflow.com/a/23982005/1123955
+      */
+    let timestamp = this.payload.timestamp
+
+    /**
+      * 1e11:
+      *   in milliseconds:  Sat Mar 03 1973 09:46:39 UTC
+      *   in seconds:       Wed Nov 16 5138 9:46:40 UTC
+      */
+    if (timestamp < 1e11) {
+      timestamp *= 1000 // turn seconds to milliseconds
+    }
+
+    return new Date(timestamp)
   }
 
   /**