Subject: Re: [xsl] Working with xs:date and xs:gYearMonth From: Colin Paul Adams <colin@xxxxxxxxxxxxxxxxxx> Date: 23 Jun 2004 15:18:12 +0100 |
>>>>> "Michael" == Michael Kay <mhk@xxxxxxxxx> writes: Michael> <xsl:variable name="first-of-previous-month" Michael> select="xs:date('0000-01-01') + ($previous-month * Michael> $one-month)" as="xs:date"/> >> Well, Saxon 8.0 doesn't allow this (quite right too - there >> never was a year zero!). Michael> Actually, this is a minor disaster in XML Schema: in the As opposed to the major disaster that is XML Schema itself? Michael> proleptic Gregorian calendar as defined by ISO 8601:2000 Michael> the year before 0001 is indeed 0000, but in XML Schema it Michael> is -0001. Michael> The fact that there was never a year zero is rather Michael> irrelevant; there was never a year -1 either. The Michael> numbers we use were assigned to these years posthumously! which ghost did the assigning then? Post-factum, perhaps. Michael> Saxon's date arithmetic on BC dates is probably Michael> unreliable because of these problems, it's not something Michael> that is very well tested. It would be safer to use a Michael> later date as a baseline. I'll bear it in mind. >> I tried substituting -0001-01-01, which saxon doesn't complain >> of, but date='{first-of-previous-month}'" is coming out as >> date=''. Michael> Missing "$" perhaps? Yes. I've got it all working now, but using 1st December 2 BCE (well -0002-12-01) as a baseline (weird - but that's what works, for now anyway.). -- Colin Paul Adams Preston Lancashire
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