This is my code which adding production calendars
public static void AddProductionCalendar(this Project project, List<ProductionCalendarDto> productionCalendars)
{
project.Calendar = null;
var calen…...ParseExact("0001-01-01T09:00:00", "yyyy-MM-ddTHH:mm:ss", CultureInfo.InvariantCulture)...ParseExact("0001-01-01T13:00:00", "yyyy-MM-ddTHH:mm:ss", CultureInfo.InvariantCulture)));...