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Can you provide a link? In what context are you using these?

Hi i’m using in widget (wp\Apparence\Widgets)
show in column right, area “Próximos Eventos”

OLD (my calendar 1.7.3 + wp 3.0) :
https://colegiobristol.es/20140217/bienvenida-a-los-alumnos-americanos-de-intercambio/)

New (my calendar 2.0.58 + WP 3.8.1) :
https://test.colegiobristol.es/20140217/bienvenida-a-los-alumnos-americanos-de-intercambio/

What version of My Calendar? There is no 2.0.58, so I’m not at all certain what you’re using. What is the actual template in your widget?

I’m sorry
in https://test.colegiobristol.es/20140217/bienvenida-a-los-alumnos-americanos-de-intercambio/ is mycalendar 2.2.13

and in https://colegiobristol.es/20140217/bienvenida-a-los-alumnos-americanos-de-intercambio/ is mycalendar 1.7.1

My templates es “twentyten”

I’m referring to the template where you’re using {date} and {link_title},in your My Calendar widget, not your theme.