C#/.NET: How to write today's date/current time in string

You can use DateTime.Now.ToString to store the current date in the string. Depending on how you would like to format your date and time, you can pass another formatting string:

string dat = DateTime.Now.ToString("dd.MM.yyyy");
// 01.01.2015

string dat = DateTime.Now.ToString("dd-MM-yy");
// 01-01-15

string dat = DateTime.Now.ToString("d.M.yy");
// 1.1.15

string dat = DateTime.Now.ToString("dd.MM.yy HH:mm:ss");
// 01.01.15 00:00:00

string dat = DateTime.Now.ToString("yyyyMMdd");
// 20150101

Hereby, among others, you can use the following format specifiers:

• "yyyy" for a four-digit year (2014), "yy" for a two-digit year (14)
• "MM" for a two-digit month with leading zeros, "M" for the month without leading zeros
• "dd" and "d" accordingly for the day
• "HH", "H", "mm", "m", "ss" and "s" accordingly for hour, minute and second with or without leading zeros

As you can see in the example above, you can also use other characters such as dots or hyphens between the format specifiers like you want.
2014-09-04 at 20:58