I have a data file that contains current meter data for multiple days.

I am trying to use the Processing Modeller to extract a single days worth of data for further manipulation, using the `Extract by Expression` algorithm.

My input data layer has the date in it, with the format `dd/mm/yy` (i.e 01/12/19)
[![enter image description here](https://i.stack.imgur.com/sCQhq.jpg)](https://i.stack.imgur.com/sCQhq.jpg)

I've tested my selection expression using Select by expression in QGIS as per below, which correctly selects 1 days worth of data.[![enter image description here](https://i.stack.imgur.com/8KOjt.jpg)](https://i.stack.imgur.com/8KOjt.jpg)

Building my model, I select the input later using a vector feature parameter definition. I then used String parameter definition to input the required date `'25/12/19'` and the date field `"%Date"`

[![enter image description here](https://i.stack.imgur.com/vajkv.jpg)](https://i.stack.imgur.com/vajkv.jpg)[![enter image description here](https://i.stack.imgur.com/OyPnv.jpg)](https://i.stack.imgur.com/OyPnv.jpg)

I entered the below expression into the Processing Modeller to match the `Select by Expression` that I tested ealier.
[![enter image description here](https://i.stack.imgur.com/4h4dN.jpg)](https://i.stack.imgur.com/4h4dN.jpg)

When I run the model, nothing is extracted to the result layer.

I'm sure it's probably a syntax problem, but can't figure it out.