With the last update of Chronos (Nov 19-20), compatability between Timex and Chronos has been borked.
At least that's what Anduin said.
Well in any case, it came with an error report, if it'll help...
Count: 1
Error: Interface\AddOns\Sky\Sky.lua:327: attempt to call field `scheduleRepeating' (a nil value)
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Count: 4
Error: Interface\AddOns\Sky\Sky.lua:235: attempt to index field `?' (a nil value)