DateTime Formatting C# with Example

Standard DateTime Formatting 
DateTimeFormatInfo specifies a set of specifiers for simple date and time formatting. Every specifier correspond to 
a particular DateTimeFormatInfo format pattern. 
//Create datetime 
DateTime dt = new DateTime(2016,08,01,18,50,23,230); 
var t = String.Format("{0:t}", dt); // "6:50 PM" ShortTime 
// "8/1/2016" ShortDate 
var d = String.Format("{0:d}", dt); 
var T = String.Format("{0:T}", dt); // "6:50:23 PM" LongTime 
// "Monday, August 1, 2016" LongDate 
var D = String.Format("{0:D}", dt); 
// "Monday, August 1, 2016 6:50 PM" LongDate+ShortTime 
var f = String.Format("{0:f}", dt); 
var F = String.Format("{0:F}", dt); // "Monday, August 1, 2016 6:50:23 PM" FullDateTime 
// "8/1/2016 6:50 PM" ShortDate+ShortTime 
var g = String.Format("{0:g}", dt); 
// "8/1/2016 6:50:23 PM" ShortDate+LongTime 
var G = String.Format("{0:G}", dt); 
var m = String.Format("{0:m}", dt); // "August 1" MonthDay 
// "August 2016" YearMonth 
var y = String.Format("{0:y}", dt); 
// "SMon, 01 Aug 2016 18:50:23 GMT" RFC1123 
var r = String.Format("{0:r}", dt); 
// "2016-08-01T18:50:23" SortableDateTime 
var s = String.Format("{0:s}", dt); 
var u = String.Format("{0:u}", dt); // "2016-08-01 18:50:23Z" 
UniversalSortableDateTime 
Custom DateTime Formatting 
There are following custom format specifiers: 
y (year) 
M (month) 
d (day) 
h (hour 12) 
H (hour 24) 
m (minute) 
s (second) 
f (second fraction) 
F (second fraction, trailing zeroes are trimmed) 
t (P.M or A.M) 
z (time zone). 
year 
var year = String.Format("{0:y yy yyy yyyy}", dt); // "16 16 2016 2016" 
month 
var month = String.Format("{0:M MM MMM MMMM}", dt); // "8 08 Aug August" 
var day = String.Format("{0:d dd ddd dddd}", dt); // "1 01 Mon Monday" day 
hour 12/24 
var hour = String.Format("{0:h hh H HH}", dt); // "6 06 18 18" 
minute 
var minute = String.Format("{0:m mm}", dt); // "50 50" 
var secound = String.Format("{0:s ss}", dt); // "23 23" second 
sec.fraction 
var fraction = String.Format("{0:f ff fff ffff}", dt); // "2 23 230 2300" 
var fraction2 = String.Format("{0:F FF FFF FFFF}", dt); // "2 23 23 23" without zeroes 
A.M. or P.M. 
var period = String.Format("{0:t tt}", 
dt); // "P PM" 
time zone 
var zone = String.Format("{0:z zz zzz}", dt); // "+0 +00 +00:00" 
You can use also date separator / (slash) and time sepatator : (colon). 
 

For code example 
For more information MSDN.