ByteDecoder/ByteDecoder.Common

namespace ByteDecoder.Common;

/// <summary>
/// DateTimeOffset extensions.
/// </summary>
public static class DateTimeOffsetExtensions
{
    /// <summary>
    /// Extend a contract based in a number of months to the last day of the month.
    /// </summary>
    /// <param name="current">Current date to extend.</param>
    /// <param name="months">Month number extension.</param>
    /// <returns>New extended DateTimeOffset.</returns>
    public static DateTimeOffset ExtendContract(this DateTimeOffset current, int months)
    {
        var newContractDate = current.AddMonths(months).AddTicks(-1);

        return new DateTimeOffset(
            newContractDate.Year,
            newContractDate.Month,
            DateTime.DaysInMonth(newContractDate.Year, newContractDate.Month),
            23, 59, 59, current.Offset);
    }
}