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Unit
DateUtils
function DateOf(const Avalue: TDateTime): TDateTime;
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ʹÓà DateOf º¯ÊýÓÃÀ´°ÑÒ»¸ö TDateTime ÀàÐ͵ıäÁ¿×ª±ä³ÉÒ»¸ö
Ö»´øÓÐÈÕÆÚµÄ TDateTime ÀàÐͱäÁ¿¡£
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showmessage(DateTimetostr(dateof(now())));
ÄãµÃµ½µÄÊÇ 2003/03/19
¶ø showmessage(DateTimetostr((now())));
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¡ñfunction DateTimeToStr(DateTime: TDateTime): string;
ÃèÊö
DateTimeToString º¯Êý½« TDateTime ÀàÐ͵IJÎÊý DateTime ת»»³ÉÒ»¸ö
×Ö·û´®£¬Ê¹Óøø¶¨µÄÈ«¾Ö±äÁ¿ ShortDateFormat µÄ¸ñʽ£¬Ê±¼ä²¿·Ö°´ÕÕ
¸ø¶¨µÄÈ«¾Ö±äÁ¿ LongTimeFormat µÄ¸ñʽ¡£
ÆäÖÐ DateTime ΪÁãµÄ²¿·Ö½«²»»áÏÔʾ³öÀ´¡£
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ShortDateFormat:=’yyyy mm dd’;
showmessage(DateTimetostr((now())));
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¡ñprocedure DateTimeToString(var Result: string; const Format: string; DateTime: TDateTime);
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DateTimeToString ·½·¨½«TDateTimeÀàÐ͵IJÎÊýDateTime °´ÕÕÓɲÎÊýFormatÌṩµÄ¸ñʽ
ת»¯³É×Ö·û´®£¬²¢±£´æÔÚResultÖС£
¶ÔÓÚFormatµÄ¸ñʽÀàÐÍ£¬Çë¿´ Date-Time format strings µÄ°ïÖú¡£
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DateTimeToString(result,’yyyy mm dd’,now());
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¡ñprocedure DateTimeToSystemTime(DateTime: TDateTime; var SystemTime: TSystemTime);
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ÓÐʱΪÁ˵÷ÓÃAPIº¯ÊýÀ´Ê¹ÓÃϵͳʱ¼ä£¬Äã¿ÉÒÔʹÓà DateTimeToSystemTime ·½·¨£¬À´½«Ò»¸ö
TDateTime ÀàÐ͵Äʱ¼ä±äÁ¿×ª»»³ÉÒ»¸ö TSystemTime ÀàÐÍµÄ ÏµÍ³Ê±¼ä¡£
¡ñfunction DateTimeToUnix(const Avalue: TDateTime ): Int64;
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ʹÓà DateTimeToUnix º¯ÊýÀ´½«Ò»¸ö TDateTime ÐÍʱ¼ä±äÁ¿×ª»»³ÉÒ»¸öÏàÓ¦µÄ Unix ¸ñʽ
µÄÈÕÆÚºÍʱ¼ä¡£
Unix date-and-time values are encoded as the number of seconds that have elapsed
since midnight at the start of January 1, 1970.
¡ñfunction DateToStr(Date: TDateTime): string;
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ʹÓà DateToStr º¯ÊýÄܵõ½ TDateTime ÈÕÆÚʱ¼äÀàÐ͵ÄÈÕÆÚ²¿·Ö¡£ÈÕÆÚµÄת»»¸ñʽÒÀÀµÓÚ
È«¾Ö±äÁ¿ ShortDateFormat¡£
¡ñfunction DayOf(const Avalue: TDateTime): Word;
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¶ÔÓÚ¸ø¶¨µÄTDateTimeÀàÐ͵ÄÈÕÆÚʱ¼ä£¬Ê¹Óà DayOf º¯ÊýÄܵõ½¸ÃÈÕÆÚÊǸÃÔ·ݵÄ


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