Hi, in my tests with H2 version 1.3.173 i have found that reading a 
timestamp value is slow respect other data type.

I have found in DateTimeUtils the function convertDateValueToTimestamp, a 
code like:

        long ms = getMillis(TimeZone.getDefault(),
                yearFromDateValue(dateValue),
                monthFromDateValue(dateValue),
                dayFromDateValue(dateValue),
                (int) h, (int) m, (int) s, 0);

I think TimeZone.getDefault() is not a good idea because it's implemented 
how a clone of the original object:

    public static TimeZone getDefault() {
        return (TimeZone) getDefaultRef().clone();
    }


perhaps keep in cache the default timezone can increase speed.

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