Just to close this. I finally installed the Date Range Picker and I used Archetype to have multiple entries: And I created an extension to get the date ranges:

public static List<DateRange> GetDateRanges(this IPublishedContent node, string alias)
    {
        List<DateRange> dateRanges = new List<DateRange>();
        var archetypeModel = node.GetPropertyValue<ArchetypeModel>(alias);
        if (archetypeModel != null && archetypeModel.Fieldsets != null)
        {
            foreach (var item in archetypeModel)
            {
                dateRanges.Add(item.GetValue<Diplo.DateRangePicker.DateRange>("dateRange"));
            }
        }
        return dateRanges;
    }

The package seems to be working fine for 7.4.3, the only bad thing is that I could't find it on NuGet.