How to interpret ButtonDownFcn event data for axis which limit is datetime?

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This seems like something obvious but I've searched for this all afternoon and can't come up with anything that addresses my issue. I've been struggling with my buttondownfcn callback on an axes which xaxis is defined in datetime.
K>> ax.XAxis
ans =
DatetimeRuler with properties:
Limits: [Aug 21, 2017, 21:00 Aug 21, 2017, 22:45]
TickValues: [Aug 21, 2017, 21:00 Aug 21, 2017, 21:15 Aug 21, 2017, 21:30 Aug 21, 2017, 21:45 Aug 21, 2017, 22:00 Aug 21, 2017, 22:15 Aug 21, 2017, 22:30 Aug 21, 2017, 22:45]
TickLabelFormat: 'HH:mm'
Show all properties
The eventinformation comes in as
K>> eventdata
eventdata =
Hit with properties:
Button: 1
IntersectionPoint: [0.927083313465118 5.139902343750000e+02 -1]
Source: [1×1 Axes]
EventName: 'Hit'
I've read that is the "location of last button click, in axes data units", but the x value doesn't look like a datenum. I thought it might be an offset from the axis limit but
K>> ax.XLim(1)+eventdata.IntersectionPoint(1)
ans =
datetime
Aug 22, 2017, 19:14
is not where I picked. I picked as closed to the 22:15 tick mark (in the attached image) as I could. It's close but there's an origin somewhere that I seem to be missing.
Can anyone shed some light on this?
  6 Comments
Walter Roberson
Walter Roberson on 22 Sep 2017
Campion Loong, I suggest you copy your responses to be an Answer so they can be Accepted.

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Accepted Answer

Campion Loong
Campion Loong on 22 Sep 2017
As Walter suggested, pasting my comment as answer:
Give these functions a try and see if they suit your needs. Looking at your question, num2ruler is a more likely candidate. You'll need to pass it the specific ruler you are working with:
  2 Comments
Joris Brouwer
Joris Brouwer on 12 Sep 2022 at 14:51
Thanks! This was not trivial once I zoomed in or panned the figure. Should be in Matlab documentation itself for the ButtonDownFcn. But this works exactly as intended.

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