> I suspect that multiple json formats may be available in the wild. Some > parsed as a list of strings and some parsed as a list of numbers. > The JSON schema allows either: Ah, thanks for looking this up! So (format "%s" (caar date)) instead of (number-to-string (caar date))? (That was actually my initial solution, purely out of being defensive and trying to make sure it doesn't break in yet a different way should other things than numbers turn up in date-parts, even nil or such. Then I thought it was too hamfisted and didn't have the time to make a case for being so defensive here. But since it's needed even just to be *compliant*, the case seems quite clear now.) > Can you provide an example json file demonstrating the problem? Sure, I'm attaching a short sample. Best, David