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<title>第三章</title>
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<div style='text-align:justify;mso-line-spacing:"135 0 0";position:absolute;
top:6.25%;left:9.36%;width:26.59%;height:6.0%'><nobr><span style='font-size:
117%;color:red'><b><span style='mso-spacerun:yes'>
</span>5</b></span><span style='font-family:宋体;mso-fareast-font-family:宋体;
font-size:117%;color:red'><b>、日期常量 </b></span></nobr></div>
<div style='text-align:justify;mso-line-spacing:"135 0 0";position:absolute;
top:14.24%;left:9.36%;width:88.2%;height:19.5%'><b><span
style='mso-spacerun:yes'> </span></b><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>日期（</b></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-font-family:"Arial Unicode MS";mso-fareast-language:ZH-CN'><b>Date</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>）型数据按</b></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-font-family:"Arial Unicode MS";mso-fareast-language:ZH-CN'><b>8</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>字节的浮点数来存储，表示日期范围从公元</b></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-font-family:"Arial Unicode MS";mso-fareast-language:ZH-CN'><b>100</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>年</b></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-font-family:"Arial Unicode MS";mso-fareast-language:ZH-CN'><b>1</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>月</b></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-font-family:"Arial Unicode MS";mso-fareast-language:ZH-CN'><b>1</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>日</b></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-font-family:"Arial Unicode MS";mso-fareast-language:ZH-CN'><b>~9999</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>年</b></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-font-family:"Arial Unicode MS";mso-fareast-language:ZH-CN'><b>12</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>月</b></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-font-family:"Arial Unicode MS";mso-fareast-language:ZH-CN'><b>31</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>日，而时间范围从</b></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
mso-fareast-font-family:"Arial Unicode MS";mso-fareast-language:ZH-CN'><b>0:00:00~23:59:59</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>。</b></span><span
style='font-family:"Arial Unicode MS";mso-fareast-font-family:"Arial Unicode MS";
display:none'><b> </b></span></div>
<div style='mso-line-spacing:"135 0 0"'><span style='position:absolute;
top:35.75%;left:9.36%;width:104.68%;height:5.25%'><span style='color:black'><b><span
style='mso-spacerun:yes'> </span></b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;color:black'><b>一种在字面上可被认作日期和时间的字符，只要用号码符</b></span></span><span
style='position:absolute;top:43.0%;left:9.36%;width:88.2%;height:5.25%'><span
style='font-family:"Times New Roman";mso-ascii-font-family:宋体;mso-fareast-font-family:
"Arial Unicode MS";mso-hansi-font-family:"Times New Roman";color:black'><b>“</b></span><span
lang=EN-US style='color:black;mso-fareast-language:ZH-CN'><b>#</b></span><span
lang=EN-US style='font-family:"Times New Roman";mso-ascii-font-family:宋体;
mso-fareast-font-family:"Arial Unicode MS";mso-hansi-font-family:"Times New Roman";
color:black;mso-fareast-language:ZH-CN'><b>”</b></span><span style='font-family:
宋体;mso-fareast-font-family:宋体;color:black'><b>括起来，都可以作为日期型数值常量。</b></span><span
style='font-family:"Arial Unicode MS";mso-fareast-font-family:"Arial Unicode MS";
display:none'><b> </b></span></span></div>
<div style='mso-line-spacing:"135 0 0"'><span style='position:absolute;
top:50.24%;left:9.36%;width:101.12%;height:5.25%'><span style='color:black'><b><span
style='mso-spacerun:yes'> </span></b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;color:black'><b>例：</b></span><span
lang=EN-US style='color:black;mso-fareast-language:ZH-CN'><b>#09/02/99#</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;color:black'><b>、</b></span><span
lang=EN-US style='color:black;mso-fareast-language:ZH-CN'><b>#January 4,1989#</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;color:black'><b>，</b></span><span
lang=EN-US style='color:black;mso-fareast-language:ZH-CN'><b>#2002-5-4
14:30:00 </b></span></span><span style='position:absolute;top:57.49%;
left:9.36%;width:88.2%;height:5.25%'><span lang=EN-US style='color:black;
mso-fareast-language:ZH-CN'><b>PM#</b></span><span style='font-family:宋体;
mso-fareast-font-family:宋体;color:black'><b>都是合法的日期型常量。</b></span><span
style='font-family:"Arial Unicode MS";mso-fareast-font-family:"Arial Unicode MS";
display:none'><b> </b></span></span></div>
<div style='mso-line-spacing:"135 0 0"'><span style='position:absolute;
top:64.75%;left:9.36%;width:104.68%;height:5.25%'><span style='color:black'><b><span
style='mso-spacerun:yes'> </span></b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;color:#0033CC'><b>说明：</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;color:black'><b>当以数值表示日期数据时，整数部分代表日期，</b></span></span><span
style='position:absolute;top:71.75%;left:9.36%;width:104.68%;height:5.25%'><span
style='font-family:宋体;mso-fareast-font-family:宋体;color:black'><b>而小数部分代表时间；例如</b></span><span
lang=EN-US style='color:black;mso-fareast-language:ZH-CN'><b>1</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体;color:black'><b>表示</b></span><span
lang=EN-US style='color:black;mso-fareast-language:ZH-CN'><b>1899</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>年</b></span><span
lang=EN-US style='mso-fareast-language:ZH-CN'><b>12</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>月</b></span><span
lang=EN-US style='mso-fareast-language:ZH-CN'><b>31</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>日。大于</b></span><span
lang=EN-US style='mso-fareast-language:ZH-CN'><b>1</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>的</b></span></span><span
style='position:absolute;top:79.0%;left:9.36%;width:104.68%;height:5.25%'><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>整数表示该日期以后的日期，</b></span><span
lang=EN-US style='mso-fareast-language:ZH-CN'><b>0</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>和小于</b></span><span
lang=EN-US style='mso-fareast-language:ZH-CN'><b>0</b></span><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>的整数表示该日期以</b></span></span><span
style='position:absolute;top:86.25%;left:9.36%;width:88.2%;height:5.25%'><span
style='font-family:宋体;mso-fareast-font-family:宋体'><b>前的日期。</b></span><b> </b></span></div>
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