Hi spazmodius,
Unfortunately previous input is gone. However, you can still have something similar and use
inputDateParser.
Demo: https://jsfiddle.net/BlackLabel/jm6gef9r/
Alternatively, you could create your own custom input and a parser and apply selected date range with
setExtremes method, which by the way is used by Highcharts input and range selector under the hood.
Let me know if you have any further questions!
Regards!