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Keith, given your seemingly-encyclopaedic knowledge of all things to do with dates, time-zones and the like, I'm surprised at you confusing a "[solstice](https://en.wikipedia.org/wiki/Solstice)" ("_when the Sun appears to reach its most northerly or southerly excursion relative to the celestial equator_") and the "solidus" (the Unicode name for the "[slash](https://en.wikipedia.org/wiki/Slash_(punctuation\))" and, when reversed, the "[backslash](https://en.wikipedia.org/wiki/Backslash)"). :-)
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(Scott's reply wasn't there when I started this...)