Failed to parse time string

Hi - trying to save a page and am getting a server error:

Server Error

Sorry, something went terribly wrong!

0 - An exception has been thrown during the rendering of a template (“Failed to parse time string (13/01/2025) at position 0 (1): Unexpected character”)

The header of the page is:


publish_date: 10/07/2023
title: ‘JaniKing Cricket Beano’
author: ‘Don Robertson’
body_classes: ‘header-lite fullwidth blogstyling’
taxonomy:
category:
- blog
tag:
- NZervio
- ‘Building Maintenance’
media_order: highcleaning.jpg
date: 10/07/2023

The date format in the user/config/system.yaml file is

dateformat:
default: d/m/Y
short: ‘jS M Y’
long: ‘F jS \a\t g:ia’

I’ve had this problem before and don’t recall what I did - I think I modified the theme to ignore the system date formats, but I’d like a decent fix if possible.

Also - clearing the cache doesn’t help. If I edit the md file and change the title, refresh the cache and then try to edit the page in Admin, I see the changed title, but still get the error - even though the date in the error message (today’s date) isn’t in the md file.

The page displays as expected. Other pages with the same dates in the header file - in fact I copied the header section from one page to another - can be edited.

But I can’t see the Date 13/01/2025 in the Page-Header. Is it somewhere else?