Dating for separated
The following table provides information on these four standard date and time format strings.
Parse Exact methods, which require an input string to exactly conform to a particular pattern for the parse operation to succeed.
Many standard format strings map to multiple custom format strings, so a date and time value can be represented in a variety of formats and the parse operation will still succeed.
A standard date and time format string uses a single format specifier to define the text representation of a date and time value.
Any date and time format string that contains more than one character, including white space, is interpreted as a custom date and time format string; for more information, see Custom Date and Time Format Strings.