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using System.Globalization;
String format="D";
DateTime date=DataTime,Now;
Response.Write(date.ToString(format, DateTimeFormatInfo.InvariantInfo));
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d ShortDatePattern
D LongDatePattern
f ÍêÕûÈÕÆÚºÍʱ¼ä£¨³¤ÈÕÆÚºÍ¶Ìʱ¼ä£©
F FullDateTimePattern£¨³¤ÈÕÆÚºÍ³¤Ê±¼ä£©
g ³£¹æ£¨¶ÌÈÕÆÚºÍ¶Ìʱ¼ä£©
G ³£¹æ£¨¶ÌÈÕÆÚºÍ³¤Ê±¼ä£©
m¡¢M MonthDayPattern
r¡¢R RFC1123Pattern
s ʹÓõ±µØÊ±¼äµÄ SortableDateTimePattern£¨»ùÓÚ ISO 8601£©
t ShortTimePattern
T LongTimePattern
u UniversalSortableDateTimePattern ÓÃÓÚÏÔʾͨÓÃʱ¼äµÄ¸ñʽ
U ʹÓÃͨÓÃʱ¼äµÄÍêÕûÈÕÆÚºÍʱ¼ä£¨³¤ÈÕÆÚºÍ³¤Ê±¼ä£©
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dd ÔÂÖеÄijһÌ졣һλÊýµÄÈÕÆÚÓÐÒ»¸öǰµ¼Áã¡£
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M Ô·ÝÊý×Ö¡£Ò»Î»ÊýµÄÔ·ÝûÓÐǰµ¼Áã¡£
MM Ô·ÝÊý×Ö¡£Ò»Î»ÊýµÄÔ·ÝÓÐÒ»¸öǰµ¼Áã¡£
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MMMM Ô·ݵÄÍêÕûÃû³Æ£¬ÔÚ MonthNames Öж¨Òå¡£
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