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Whenever I use the \neg command I get this badbox warning:
Overfull \hbox (6.03711pt too wide) in paragraph

For example, this code works fine:
\documentclass[12pt, dutch]{report} % to allow chapter tags
\usepackage{mathtools} % use the floor and ceil operators.
\usepackage{amsmath} % use of the ...

Hey Rainer! Thank you very much:
\xdef\timeInit{\timeInit}
did the trick!

Thank you Johannes_B, I will try and clarify with a working example:
\documentclass[12pt, dutch]{report} % to allow chapter tags
\usepackage{subfiles} % for splitting the project into seperate files
\usepackage{calculator} % perform calculations within LaTeX
\usepackage{memory} % use global ...

Goal:
I wish to update variables (created with the calculator-package ) in subfiles.

Question:
How can I set a number in a main file, and perform calculations on the value in a subfile, in such a way that it affects the variable in the main file

Problem:
changes to the variables in subfiles ...