Hi Juanma,
I believe the issue may relate to the CSS selector currently being used to pull in the Date information.
The current CSS selector is: .info-evento .info-evento__section:nth-child(5) span:nth-child(2). This does not seem to be targeting the correct content in many cases.
I think the correct CSS selector for the Date would look like this: span[itemprop=startDate].
I came up with this by inspecting the page and looking at the properties for the Date span, which you can see highlighted on the right.
This should fix the issue where it seems like the Connector isn’t updating the Date field!
Best,
DJ