C# datetime first day of month
- C# datetime get first day of month
- C# datetime set first day of month
- C# datetime first day of current month
- C# datetime get first day of next month
- C# datetime get first and last day of month
- C# datetime first day of next month
- C# datetime first day of last month
- C# check if datetime is first day of month
- C# быстрый старт