Ask: how to format ‘11’ as ‘0101’

yyhg520

Ask: how to format ‘11’ into ‘0101’, that is, format the string into MMDD format

wxp1281

Convert.ToDateTime(1999121)

123ffff

DateTime a = new DateTime(2016,7,9,11,9,1)
Initializes a new instance of the DateTime structure to the specified year, month, day, hour, minute, and second.

Your string needs to be split

yyhg520

How to format ‘11’ into ‘0101’, that is, format the string into MMDD format

wxp1281

Convert.ToDateTime("11-2").ToString();
This format can be converted to MMDD
If you want to use pure 11 to convert to 0101, you may need to write a method yourself

yyhg520

Can't the string.Format method convert 11 to 0101? ?

123ffff

People know that "11" is "January 1st", and the two-digit number is fine, but what if it is "111"? Is it January 11th or November 1st?
It will be confusing, so first split to specify the month and day.