Can't seem to update timestamptz column with Dart API

await supabase
  .from('clockey')
  .update({'time': newTime}).match({'id': eventId});

await supabase
  .from('clockey')
  .update({'time': newTime}).match({'id': eventId});

Converting object to an encodable object failed: Instance of 'DateTime'

Converting object to an encodable object failed: Instance of 'DateTime'