它应该是DateTime。ToString("MMMM")

你不需要所有额外的Ms。

您可以使用系统中的CultureInfo。全球化来获取数据，基于当前正在使用的文化。

_ = CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName(DateTime.Now.Month)

或者，使用InvariantCulture来获得英文名称。

_ = CultureInfo.InvariantCulture.DateTimeFormat.GetMonthName(DateTime.Now.Month);

用这个来表示当月的全名:

DateTime date = DateTime.Now;
string month = $"{date:MMMM}"; // f.g October

用它来做月份的缩写:

DateTime date = DateTime.Now;
string month = $"{date:MMM}"; // f.g Oct

用它来表示本周的全称:

DateTime date = DateTime.Now;
string month = $"{date:dddd}"; // f.g Saturday

用这个作为一周的缩写:

DateTime date = DateTime.Now;
string month = $"{date:ddd}"; // f.g Sat

你可以用这个结构f.g设置每个自定义模板:

DateTime date = DateTime.Now;
string month = $"{date:dd/MMM/yyyy}"; // 12/Oct/2022
string month = $"{date:dd-MM-yyyy}"; // 12-10-2022
string month = $"{date:dd MMMM yyyy}"; // 12 October 2022
string month = $"{date:ddd - - - MMM}"; // Sat - - - Oct
string month = $"{date:ddddd $- yyyy}"; // Saturday $- 2022
string month = $"{date:ddMMyyyy}"; // 12102022

使用"MMMM"自定义格式说明符:

DateTime.Now.ToString("MMMM");

它应该是DateTime。ToString("MMMM")

你不需要所有额外的Ms。

DateTime birthDate = new DateTime(1981, 8, 9);
Console.WriteLine ("I was born on the {0}. of {1}, {2}.", birthDate.Day, birthDate.ToString("MMMM"), birthDate.Year);

/* The above code will say:
"I was born on the 9. of august, 1981."

"dd" converts to the day (01 thru 31).
"ddd" converts to 3-letter name of day (e.g. mon).
"dddd" converts to full name of day (e.g. monday).
"MMM" converts to 3-letter name of month (e.g. aug).
"MMMM" converts to full name of month (e.g. august).
"yyyy" converts to year.
*/