If / Then statement based on another field's value (ADOBE ACROBAT PRO FORMS)

Hi all; I've been struggling trying to add an If/then statement, based on the value selected on a drop-down; list within the form. I have created the Java-script for this, and it seems that this (script) is correct; however, it doesn't display the required info. I really appreciate if someone can give me a hint or a definite solution.... Thanks much! Jackie. Here's part of the code I used: var INICIO = this.getField("INICIO").valueAsString; if (INICIO=="LUNES-16-DICIEMBRE-2024") FIN = "MARTES-31-DICIEMBRE-2024"; else if (INICIO=="MIERCOLES-1-ENERO-2025") FIN = "MIERCOLES-15-ENERO-2025"; else if (INICIO=="JUEVES-16-ENERO-2025") FIN = "VIERNES-31-ENERO-2025"; else if (INICIO=="SABADO-1-FEBRERO-2025") FIN = "SABADO-15-FEBRERO-2025"; else if (INICIO=="DOMINGO-16-FEBRERO-2025") FIN = "SABADO-15-FEBRERO-2025"; else if (INICIO=="SABADO-1-MARZO-2025") FIN = "SABADO-15-MARZO-2025"; else if (INICIO=="DOMINGO-16-MARZO-2025") FIN = "LUNES-31-MARZO-2025"; else if (INICIO=="MARTES-1-ABRIL-2025") FIN = "MARTES-15-ABRIL-2025"; //and so on...