Zingtree has built a handy webhook so that you can reformat a date to a new format. You just need to add a new Webhook and install it into the node where you want the new format to take place. Here's how to set it up:

Step 1: Add the Webhook to your Organization

1. Go to Account Settings, My Apps.
2. Click on Add Webhook.
3. Give the Webhook a name (like "Reformat date"), and enter this for the webhook URL:
   

   https://zingtree.com/apps/webhook/filters/date-reformat.php?

 The end result looks like this: 

Step 2: Collect a date in your tree

Set up a data entry field in your tree using the Date field type and the variable name of:

 date

Step 3: Call the webhook from your tree

Open your tree, and add the webhook to a node before you want a new date format to appear.

1. Under the Apps / Webhooks tab, click Add App / Webhook.
2. Pick the Webhook you added previously (Reformat Date , for example).
3. In the Message Data area, enter something like this:

   var=new_date&format=yy-mm-dd&date=date

   Here's what that message data means:
   var: The new variable that will be created with the new date format.
   format: The format of the new date. Note:Date Formats can be found here.
   date: the name of the variable used in the date you originally collected in Step 2.
   
   

Save the changes to the node. Your edits should look something like this:

Now just use #‌new_date# anywhere you want to show the newly formatted date.

• Webhooks Library
• Troubleshooting Webhooks