m24 - reading date and time values - 29 of 31.mht

sas的考试样题

href=3D"http://www.sas.com/apps/OLTRN/59080/m24/m24_16.htm">YEARCUTOFF=3D=
</A>=20
      system option. The default value of YEARCUTOFF=3D is 1920. You can =
check or=20
      reset the value of this option in your SAS session to use a =
different=20
      100-year span for date =
informats.</TD></TR></TBODY></TABLE></CENTER>
<P align=3Dcenter>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"85%" border=3D0>
  <TBODY>
  <TR>
    <TD><STRONG>Using Dates and Times In Calculations</STRONG><BR>Date =
and=20
      time values can be <A=20
      onmouseover=3D"window.status=3D'Display information on using dates =
in equations.'; "=20
      onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
      href=3D"http://www.sas.com/apps/OLTRN/59080/m24/m24_20.htm">used =
in=20
      calculations</A> like other numeric values. In addition to =
tracking time=20
      intervals, SAS date and time values can be used with SAS functions =
and=20
      with complex calculations.</TD></TR></TBODY></TABLE><BR>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"85%" border=3D0>
  <TBODY>
  <TR>
    <TD>
      <P><STRONG>Using Date and Time Formats<BR></STRONG>SAS provides =
many=20
      specialized date and time formats that enable you to specify how =
date and=20
      time values are displayed and stored. You can use the <A=20
      onmouseover=3D"window.status=3D'Display information on using the =
WEEKDATEw. format.'; "=20
      onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
      =
href=3D"http://www.sas.com/apps/OLTRN/59080/m24/m24_26.htm">WEEKDATE<EM>w=
</EM>.</A>=20
      format to write date values in the form <EM>day-of-week</EM>,=20
      <EM>month-name dd</EM>, <EM>yy</EM> (or <EM>yyyy</EM>). You can =
use the <A=20
      onmouseover=3D"window.status=3D'Display information on using the =
WORDDATEw. format.'; "=20
      onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
      =
href=3D"http://www.sas.com/apps/OLTRN/59080/m24/m24_27.htm">WORDDATE<EM>w=
</EM>.</A>=20
      format to write date values in the form <EM>month-name dd</EM>,=20
      <EM>yyyy.</EM></P></TD></TR></TBODY></TABLE></CENTER><!-- =
InstanceEndEditable --><BR>
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    <TD align=3Dleft>
      <HR>
    </TD></TR></TBODY></TABLE>
<P><!-- InstanceBeginEditable name=3D"syntax" -->
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    <TD><STRONG><A name=3DSyntax>Syntax</A></STRONG>=20
      <P><EM>To go to the page where a statement or option was =
presented, select=20
      a link.</EM> </P></TD></TR></TBODY></TABLE><BR></CENTER>
<P align=3Dcenter>
<TABLE cellPadding=3D2 align=3Dcenter>
  <TBODY>
  <TR>
    <TD><FONT color=3D#003399><STRONG>OPTIONS <A=20
      onmouseover=3D"window.status=3D'Display information on the =
YEARCUTOFF option.'; "=20
      onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
      =
href=3D"http://www.sas.com/apps/OLTRN/59080/m24/m24_16.htm">YEARCUTOFF=3D=
</A></STRONG><EM>yyyy;</EM><STRONG><BR>DATA=3D</STRONG><EM>SAS-data-set</=
EM><STRONG>;</STRONG></FONT><BR><FONT=20
      color=3D#003399>&nbsp; &nbsp; <STRONG>&nbsp;INFILE=20
      =
</STRONG><EM>file-specification</EM><STRONG>;</STRONG></FONT><BR><NOBR><F=
ONT=20
      color=3D#003399>&nbsp; &nbsp; &nbsp;<A=20
      onmouseover=3D"window.status=3D'Display information on INPUT =
statement.'; "=20
      onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
      =
href=3D"http://www.sas.com/apps/OLTRN/59080/m24/m24_7.htm"><STRONG>INPUT<=
/STRONG>=20
      <EM>pointer-control variable=20
      informat</EM>.<STRONG>;</STRONG></A></FONT></NOBR><BR><FONT=20
      color=3D#003399><STRONG>RUN;<BR>PROC PRINT=20
      =
DATA=3D</STRONG><EM>SAS-data-set</EM><STRONG>;<BR>&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;=20
      </STRONG><A=20
      onmouseover=3D"window.status=3D'Display information on date and =
time formats statement.'; "=20
      onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
      =
href=3D"http://www.sas.com/apps/OLTRN/59080/m24/m24_26.htm"><STRONG>FORMA=
T</STRONG><EM>=20
      variable =
format</EM>.<STRONG>;</STRONG></A><BR><STRONG>RUN;</STRONG>=20
      </FONT></TD></TR></TBODY></TABLE>
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<CENTER>
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    <TD align=3Dleft>
      <HR>
    </TD></TR></TBODY></TABLE><BR></CENTER><!-- InstanceEndEditable -->
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  <TR>
    <TD align=3Dleft><STRONG><A name=3DSample>Sample =
Program</A></STRONG> <PRE><FONT color=3D#003399>     options =
yearcutoff=3D1920;
     data perm.aprbills;</FONT>
<FONT color=3D#003399>        infile aprdata;</FONT>
<FONT color=3D#003399>        input LastName $8. @10 DateIn mmddyy8.
              +1 DateOut</FONT> <FONT color=3D#003399>mmddyy8. +1 =
RoomRate 6. </FONT>
<FONT color=3D#003399>              @35 EquipCost 6.;</FONT>
<FONT color=3D#003399>        Days=3Ddateout-datein+1;</FONT>
<FONT color=3D#003399>        RoomCharge=3Ddays*roomrate;</FONT>
<FONT color=3D#003399>        Total=3Droomcharge+equipcost;</FONT>
<FONT color=3D#003399>     run;</FONT>
<FONT color=3D#003399>     proc print data=3Dperm.aprbills;</FONT>
        <FONT color=3D#003399>format datein dateout worddate12.;</FONT>
<FONT color=3D#003399>     run;</FONT>
</PRE>
      <P>
      <HR>
    </TD></TR></TBODY></TABLE><BR><!-- InstanceEndEditable -->
<P><!-- InstanceBeginEditable name=3D"pointstoremember" -->
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"85%" border=3D0>
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  <TR>
    <TD align=3Dleft><STRONG><A name=3DPoints>Points to =
Remember</A></STRONG>=20
      <P>
      <UL>
        <LI>SAS makes adjustments for leap years, but not for leap =
seconds or=20
        daylight saving time. <BR><BR>
        <LI>The minimum acceptable field width for the TIME<EM>w</EM>. =
informat=20
        is 5. If you specify a <EM><STRONG>w</STRONG></EM> value less =
than 5,=20
        you'll receive an error message in the SAS log. <BR><BR>
        <LI>The default value of the YEARCUTOFF=3D option is 1920. When =
you work=20
        with two-digit year data, remember to check the default value of =
the=20
        YEARCUTOFF=3D option, and change it if necessary. <BR><BR>
        <LI>The value of the YEARCUTOFF=3D system option does not affect =

        four-digit year values. Four-digit values are always read =
correctly.=20
        <BR><BR>
        <LI>Be sure to specify the proper informat for reading a date =
value, and=20
        specify the correct field width so that the entire value is =
read.=20
        <BR><BR>
        <LI>If SAS date values appear in your program output, use a date =
format=20
        to display them in legible form. =
</LI></UL></TD></TR></TBODY></TABLE><!-- InstanceEndEditable =
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    <TD>&nbsp;</TD>
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      face=3D"Arial, Helvetica, sans-serif">Copyright</FONT></A> <FONT=20
      face=3D"Arial, Helvetica, sans-serif">=A9 2003 SAS Institute Inc., =
Cary, NC,=20
      USA. All rights reserved.</FONT></FONT> <FONT=20
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