[visualization-api] Customising formats of dates in data point tooltips

Wed, 12 Apr 2017 14:28:14 -0700 

I'm very new to Google Charts and I'm experimenting with very simple line 
graphs of a variable versus date or date and time. In the resulting graph, 
if I hover over a point, a tooltip pops up which gives the value of the 
variable and the date - but the date is always in US "MMM d, yy" format (eg 
"Jan 1, 17"). Is there a way of customising the format - for example "1 Jan 
2015 13:47" with day before month (I'm British, and we prefer it that way 
round!) and with time as well as date.

I've attached the code, which is based very much on a Google Charts example 
with a few of my tweaks.

I know I could attach explicit tooltip text to each data point, but is 
there a more elegant method where you just change a format attribute for 
the tooltip.

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