C#所有日期格式

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Response.Write("Default: " + System.DateTime.Now + " ");
 Response.Write("Local Time: " + System.DateTime.Now.ToLocalTime() + " ");
 Response.Write("Long Date: " + System.DateTime.Now.ToLongDateString() + " ");
 Response.Write("Long Time: " + System.DateTime.Now.ToLongTimeString() + " ");
 Response.Write("Short Date: " + System.DateTime.Now.ToShortDateString() + " ");
 Response.Write("Short Time: " + System.DateTime.Now.ToShortTimeString() + " ");
 Response.Write("ToString Default: " + System.DateTime.Now.ToString() + " ");
 Response.Write("Universal Time: " + System.DateTime.Now.ToUniversalTime() + " "); // returns a datetime, which can still be formatted

// Using Format Strings
 Response.Write("d - Short Date: " + System.DateTime.Now.ToString("d") + " ");
 Response.Write("D - Long Date: " + System.DateTime.Now.ToString("D") + " ");
 Response.Write("t - Short Time: " + System.DateTime.Now.ToString("t") + " ");
 Response.Write("T - Long Time: " + System.DateTime.Now.ToString("T") + " ");
 Response.Write("f - Full date/time (short time): " + System.DateTime.Now.ToString("f") + " ");
 Response.Write("F - Full date/time (long time): " + System.DateTime.Now.ToString("F") + " ");
 Response.Write("g - General: " + System.DateTime.Now.ToString("g") + " ");
 Response.Write("G - General: " + System.DateTime.Now.ToString("G") + " ");
 Response.Write("M/m - Month day: " + System.DateTime.Now.ToString("M") + " ");
 Response.Write("u - Universal Sortable: " + System.DateTime.Now.ToString("u") + " ");
 Response.Write("Y/y - Year month: " + System.DateTime.Now.ToString("y") + " ");

// Custom Format Strings
 Response.Write("d, day of month: " + System.DateTime.Now.ToString(" d") + " "); // can't use just "d"
 Response.Write("dd, zero-padded day of month: " + System.DateTime.Now.ToString("dd") + " ");
 Response.Write("ddd, abbreviated day of week: " + System.DateTime.Now.ToString("ddd") + " ");
 Response.Write("dddd, full day of week: " + System.DateTime.Now.ToString("dddd") + " ");

Response.Write("h, hour: " + System.DateTime.Now.ToString(" h") + " "); // can't use just "h"
 Response.Write("hh, hour, zero padded " + System.DateTime.Now.ToString("hh") + " ");
 Response.Write("H, hour, 24-hr " + System.DateTime.Now.ToString(" H") + " "); // can't use just "H"
 Response.Write("H, hour, 24-hr, zero padded " + System.DateTime.Now.ToString("HH") + " ");

Response.Write("m, minute: " + System.DateTime.Now.ToString(" m") + " "); // can't use just "m"
 Response.Write("M, month: " + System.DateTime.Now.ToString(" M") + " "); // can't use just "M"
 Response.Write("MM, month, zero padded: " + System.DateTime.Now.ToString("MM") + " ");
 Response.Write("MMM, month abbreviated: " + System.DateTime.Now.ToString("MMM") + " ");
 Response.Write("MMMM, month full name: " + System.DateTime.Now.ToString("MMMM") + " ");

Response.Write("y, year (omits century): " + System.DateTime.Now.ToString(" y") + " "); // can't use just "y"
 Response.Write("yy, 2-digit year, zero padded: " + System.DateTime.Now.ToString("yy") + " ");
 Response.Write("yyyy, 4-digit year, zero padded: " + System.DateTime.Now.ToString("yyyy") + " ");
 Response.Write("s: " + System.DateTime.Now.ToString("s") + " ");

执行结果：

Default: 8/12/2007 8:37:36 PM
Local Time: 8/12/2007 8:37:36 PM
Long Date: Saturday, 8 December 2007
Long Time: 8:37:36 PM
Short Date: 8/12/2007
Short Time: 8:37 PM
ToString Default: 8/12/2007 8:37:36 PM
Universal Time: 8/12/2007 12:37:36 PM
d - Short Date: 8/12/2007
D - Long Date: Saturday, 8 December 2007
t - Short Time: 8:37 PM
T - Long Time: 8:37:36 PM
f - Full date/time (short time): Saturday, 8 December 2007 8:37 PM
F - Full date/time (long time): Saturday, 8 December 2007 8:37:36 PM
g - General: 8/12/2007 8:37 PM
G - General: 8/12/2007 8:37:36 PM
M/m - Month day: 08 December
u - Universal Sortable: 2007-12-08 20:37:36Z
Y/y - Year month: December 2007
d, day of month: 8
dd, zero-padded day of month: 08
ddd, abbreviated day of week: Sat
dddd, full day of week: Saturday
h, hour: 8
hh, hour, zero padded 08
H, hour, 24-hr 20
H, hour, 24-hr, zero padded 20
m, minute: 37
M, month: 12
MM, month, zero padded: 12
MMM, month abbreviated: Dec
MMMM, month full name: December
y, year (omits century): 7
yy, 2-digit year, zero padded: 07
yyyy, 4-digit year, zero padded: 2007
s: 2007-12-08T20:39:44