> The space between the minus sign and the “<“ apparently matters. I don’t think it should:
>
> < 2015-11-21 07:11:02.517785000 > - <2015-11-11 06:50:56.721641000 >
> < 2015-11-23 05:18:35.460725000 > -<2015-11-11 06:50:56.721641000 >
You're right; it shouldn't.
I'm not working on Calc any more, though; perhaps you could send this to address@hidden