Steps to Reproduce

1. run attached example

Current Result

Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'firstChild')
at init._createItemsData (calendar.wpd:3100:19)
at init.items (calendar.wpd:3001:27)
at init.setItems (zk.wpd:9781:15)
at Function._set2 (zk.wpd:10857:38)
at setter.func (zk.wpd:21709:18)
at init.set (zk.wpd:21743:28)
at setAttr (zk.wpd:31273:15)
at Object.setAttrs (zk.wpd:31292:11)
at doProcess (zk.wpd:29398:10)
at doCmdsNow (zk.wpd:29517:11)

Expected Result

no error

Debug Information

dateNote._afterOffset is 5 which is wrong, should be 6. It's caused by error calculating the bound time in _createBoundTime()

Workaround

zkcal-124.js