Curator doesn't need to have a date stamp in the index name. You can use field_stats based ages in Curator to identify the oldest and/or youngest @timestamp field in the index, removing the need to put a timestamp in the index name.
You're much better off using a default numeric rollover naming sequence to achieve this, with the aforementioned field_stats approach in Curator. But if you must put a timestamp in your index name with a rollover approach, see this forum post.