fix(timepicker): prevent date reset on timepicker clear

Author: dysfunc

docs/package-lock.json

@@ -1,7 +1,7 @@
 {
   "name": "@svelte-plugins/datepicker",
   "description": "A simple datepicker component designed for Svelte.",
-  "version": "1.0.5",
+  "version": "1.0.6",
   "license": "MIT",
   "author": "Kieran Boyle (https://github.com/dysfunc)",
   "homepage": "https://github.com/svelte-plugins/datepicker",

package.json

@@ -791,10 +791,11 @@
       return date.getTime();
     }
 
-    const [hours, minutes] = (which === 'start' ? startDateTime : endDateTime).split(':');
+    const [hours = 0, minutes = 0, seconds = 0] = (which === 'start' ? startDateTime : endDateTime).split(':');
 
     date.setHours(hours);
     date.setMinutes(minutes);
+    date.setSeconds(seconds);
 
     return date.getTime();
   };