RealCV/src/TrueCV.Application/Helpers/DateHelpers.cs

namespace TrueCV.Application.Helpers;

public static class DateHelpers
{
    /// <summary>
    /// Calculates the number of months between two dates.
    /// </summary>
    public static int MonthsBetween(DateOnly start, DateOnly end)
    {
        return ((end.Year - start.Year) * 12) + (end.Month - start.Month);
    }

    /// <summary>
    /// Calculates the number of months between two dates.
    /// </summary>
    public static int MonthsBetween(DateTime start, DateTime end)
    {
        return ((end.Year - start.Year) * 12) + (end.Month - start.Month);
    }

    public static DateOnly? ParseDate(string? dateString)
    {
        if (string.IsNullOrWhiteSpace(dateString))
        {
            return null;
        }

        if (DateOnly.TryParse(dateString, out var date))
        {
            return date;
        }

        return null;
    }
}