New version (0.1.28) of TimechainCalendar.com allows you to adjust the average block time in future estimates. Click the block height and enter a block in the future. Then slide the slider in the estimate window that pops up to see how different average block times affect the date/time of blocks in the future! I don’t think I have seen this feature anywhere else. Try it! 
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Discussion
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Nice that could be really handy in the future.
I can't seem to figure out where to adjust the slider.
Is this where you would do it?
You don’t have the latest version. Close the browser window/tab entirely. Open a new one and load the site fresh. Check in the INFO tab, if you don’t see version 0.1.28 at the bottom you may need to clear browser cache then reload.
Thanks TC - I did refresh but it mustn't have been a full refresh. Closing the tab did the trick.
Very cool.