While it is probably much more than you want, and doesn't do dates or times I made some simple math things here <http://inmysocks.tiddlyspot.com/#MathyThing%20Plugin>. Tobias made a much simpler javascript macro that can do some math stuff here <https://tobibeer.github.io/tb5/#calc>. I made some quick macros for manipulating dates here <http://inmysocks.tiddlyspot.com/#Date%20Macro%20Demos>.
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