How to remove this "+0"?

Today I’ve been modifying a bit my Calc template. I included by mistake this “+0” in the default style which is related to numbering. This means that if I now write down a date (eg: 3/3/2003) and I use this style on it (or any other derivated from it), the cell shows the value as a number, not as a date (because LibreOffice understands dates as numbers but shows them as dates when it detects they follow some dating format).

Here is my template and some screenshots: Plantilla personalizada 11.ots (7.5 KB)

Crossposted at ¿Cómo eliminar ese "+0" del estilo predeterminado?.