When you use Calkoo to calculate the days between two dates ("calcular días entre fechas"), the tool is utilizing algorithms based on calendar systems. The most famous algorithm for this is the .

: Utilice la Calculadora de edad y diferencia para cálculos de antigüedad laboral o aniversarios. 3. Aplicaciones Prácticas de Calkoo Fechas

Here are the details on the topic and where to find related academic papers:

If you need to cite the mathematics behind Calkoo for an academic paper, you should cite the algorithm:

Several tools and software can help you perform date calculations, including: