Variables

I'm not certain how to handle a specific variable operation.

<xsl:variable name="startTime"/>
        <xsl:call-template name="date:day-name">
                <xsl:with-param name="date-time"
select="Dates/DateSpan/StartDate"/>
        </xsl:call-template>
                                                
<xsl:if test="number(substring(Dates/DateSpan/StartDate,12,2)) &gt;=
12">
        I want to set startTime = a specific number, how do I do that?
</xsl:if>


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