Hi Michael

Since you're looping over a bunch of values you probably need to ensure that you only do the date-check if the date in fact has been selected. I suspect there is at least one empty value, which is why you get this error.

I assume that the "lectureTime" is setup to be of a datatype "Datepicker", right?

/Jan

Hi Michael,

Jan is right - this error is 99.999% certain to be caused by an empty value in the lectureTime property (or a bogus value if the property isn't set up as a DatePicker).

You can safeguard by adding a predicate to the nodeselection, using the normalize-space() function to make sure the lectureTime has a value (and assuming it's a DatePicker it will be a valid one):

<xsl:template match="/">
    <xsl:for-each select="$currentPage/*[@isDoc][not(umbracoNaviHide = 1)][normalize-space(lectureTime)]">
        <xsl:sort select="lectureTime" />
        <xsl:variable name="lecType" select="lectureType" />
        <xsl:if test="umbraco.library:DateGreaterThanOrEqualToday(lectureTime)">
            <!-- Do something -->
        </xsl:if>
    </xsl:for-each>
</xsl:template>

/Chriztian

Thank you very much! Jan and Chriztian!

Thank you for taking out your time to anwser my question.

It's very kind of you. I'm very gald I can fix my problem.

I have checked the "lecture time" value of all of nodes, The values are all not empty.

I use the normalize-space() function Chriztian suggested, that's so brilliant. It's working. ;)

I think the form of lection time is not recognized by system. right?

Anyway, Thank you very much again, I very like this place where I can feel warm!

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