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using System;
using System.Globalization;
String format="D";
DateTime date=DataTime,Now;
Response.Write(date.ToString(format, DateTimeFormatInfo.InvariantInfo));
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D LongDatePattern
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F FullDateTimePattern£¨³¤ÈÕÆÚºÍ³¤Ê±¼ä£©
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m¡¢M MonthDayPattern
r¡¢R RFC1123Pattern
s ʹÓõ±µØÊ±¼äµÄ SortableDateTimePattern£¨»ùÓÚ ISO 8601£©
t ShortTimePattern
T LongTimePattern
u UniversalSortableDateTimePattern ÓÃÓÚÏÔʾͨÓÃʱ¼äµÄ¸ñʽ
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