I'm using CultureInfo() to get format of DateTime

CultureInfo culture = new CultureInfo(CultureInfo.CurrentCulture.Name);
someDateTime.ToString("d", culture));

How to get custom formats and not to lose separator which comes with CultureInfo()?

CodePudding user response：

According to the documentation for DateTimeFormatInfo.DateSeparator:

If a custom format string includes the "/" format specifier, the DateTime.ToString method displays the value of DateSeparator in place of the "/" in the result string.

So just use a custom date/time format string with slashes, and they will be replaced automatically.

Example:

var someDateTime = new DateTime(1900, 12, 21);
Console.WriteLine(someDateTime.ToString("d/M", new CultureInfo("en-US")));
Console.WriteLine(someDateTime.ToString("d/M", new CultureInfo("nl")));
Console.WriteLine(someDateTime.ToString("yyy/M", new CultureInfo("en-US")));
Console.WriteLine(someDateTime.ToString("yyy/M", new CultureInfo("nl")));

Output:

21/12
21-12
1900/12
1900-12

Just be aware that this probably isn't a great idea. The separator is not the only meaningful difference between cultures' date representations. 5/6 means May 6 to Americans, but it means June 5 to most Europeans (even those which use the same date separator).

CodePudding user response：

You can provide a format when you call ToString on DateTime objects. e.g.:

someDateTime.ToString("MM-yyyy"); // produces a formatted date like 12-1900

Formatting Info: https://www.c-sharpcorner.com/blogs/date-and-time-format-in-c-sharp-programming1

CodePudding user response：

You can also specify the separator property of the DateTimeFormatInfo object, like so:

DateTime someDateTime = DateTime.Now;
            
CultureInfo culture = new CultureInfo("en-US");
            
DateTimeFormatInfo dtfi = culture.DateTimeFormat;
dtfi.DateSeparator = "-";

someDateTime.ToString("d", culture);