C # DateTime date formatting,

C # DateTime date formatting,

In C #, DateTime is a type that contains Date and time. When ToString () is used to convert a data type to a string, you can convert it to multiple string formats based on the parameters passed to Tostring.

Directory

1. Category

2. Standard Type

3. Custom format type

 

1. Category

DateTime calls ToString ()Input parametersIt can be divided into two types: Standard and custom:

1) Standard: the system comes with a specific transferSingle CharacterIt can be converted to the format set by the system.

2) custom: freely combine date codes (y, M, d, h, m, s, and f) to display rich date formats.

 

2. Standard Type

Description: Transfer specificSingle CharacterIt can be converted to the format set by the system.

2.1 symbol comparison table

. Net version4.0

System Version: Win7

Symbol	Syntax	Example (13: 09: 55: 2350)
Y	DateTime. Now. ToString ()	13:09:55
D	DateTime. Now. ToString ("D")
D	DateTime. Now. ToString ("D")	May 9, 2016
F	DateTime. Now. ToString ("F")	May 9, 2016
F	DateTime. Now. ToString ("F")	May 9, 2016 13:09:55
G	DateTime. Now. ToString ("G")
G	DateTime. Now. ToString ("G")	13:09:55
T	DateTime. Now. ToString ("T")
T	DateTime. Now. ToString ("T")	13:09:55
U	DateTime. Now. ToString ("U")	2016-05-09 13: 09: 55Z
U	DateTime. Now. ToString ("U")	May 9, 2016 5:09:55
M	DateTime. Now. ToString ("M")	May 9
M	DateTime. Now. ToString ("M")	May 9
R	DateTime. Now. ToString ("R")	Mon, 09 May 2016 13:09:55 GMT
R	DateTime. Now. ToString ("R")	Mon, 09 May 2016 13:09:55 GMT
Y	DateTime. Now. ToString ("Y")	May 2016
Y	DateTime. Now. ToString ("Y")	May 2016
O	DateTime. Now. ToString ("O")	2016-05-09T13: 09: 55.2350000
O	DateTime. Now. ToString ("O")	2016-05-09T13: 09: 55.2350000
S	DateTime. Now. ToString ("S")	2016-05-09T13: 09: 55

 

2.2 example

 

2.3 pay attention to the system version

'-'Symbol substitution'/'Symbol.

 

3. Custom format type

Developers can use English characters (y, M, d, h, m, s, f) to replace (year, month, day, hour, minute, second, millisecond) to freely combine the date and time formats.

3.1 symbol comparison table

. Net version4.0

System Version: Win7

 

Symbol	Description	Syntax	Example (13: 09: 55: 2350)
Yy	The last two digits of the year	DateTime. Now. ToString ("Yy")	DateTime. Now. ToString ("yy"); // => 16
Yyyy	4-digit year	DateTime. Now. ToString ("Yyyy")	DateTime. Now. ToString ("yyyy"); // => 2016
MM	Two months; fill in 0 before the singular month	DateTime. Now. ToString ("MM")	DateTime. Now. ToString ("MM"); // => 05
Dd	Days	DateTime. Now. ToString ("Dd")	DateTime. Now. ToString ("dd"); // => 09
Ddd	Week	DateTime. Now. ToString ("Ddd")	DateTime. Now. ToString ("ddd"); // => Monday
Dddd	Day of the week	DateTime. Now. ToString ("Dddd")	DateTime. Now. ToString ("dddd"); // => Monday
Hh	Hours in 12-hour format	DateTime. Now. ToString ("Hh")	DateTime. Now. ToString ("hh"); // => 01
HH	Hours in the 24-hour format	DateTime. Now. ToString ("HH")	DateTime. Now. ToString ("HH"); // => 13
Mm	Minutes	DateTime. Now. ToString ("Mm")	DateTime. Now. ToString ("mm"); // => 09
Ss	Seconds	DateTime. Now. ToString ("Ss")	DateTime. Now. ToString ("ss"); // => 55
Ff	The first two digits in milliseconds	DateTime. Now. ToString ("Ff")	DateTime. Now. ToString ("ff"); // => 23
Fff	The first three digits in milliseconds	DateTime. Now. ToString ("Fff")	DateTime. Now. ToString ("fff"); // = & gt; 235
Ffff	The first four digits in milliseconds	DateTime. Now. ToString ("Ffff")	DateTime. Now. ToString ("ffff"); // = & gt; 2350
Delimiter	You can use delimiters to separate year, month, day, hour, minute, and second. The value can be non-key characters such as-,/, and :.	DateTime. Now. ToString ("yyyy-MM-dd HH: mm: ss: ffff"); // => 2016-05-09 13: 09: 55: 2350 DateTime. Now. ToString ("yyyy/MM/dd HH: mm: ss: ffff"); // => 2016/05/09 13: 09: 55: 2350 DateTime. Now. ToString ("yyyy/MM/dd HH: mm: ss: ffff dddd"); // => 2016/05/09 13: 09: 55: 2350 Monday

 

3.2 Example

 

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