HoverTool does not display datetime

[YMRTN]

ALL software version info (bokeh, python, notebook, OS, browser, any other relevant packages)

Windows 7 Enterprise
python 3.7.2
bokeh 1.0.4
Firefox 65.0.1 / Chrome 71.0.3578.98 both tested

Using bokeh serve

Description of expected behavior and the observed behavior

The tooltip should display a datetime, but instead displays 150TB %. It looks like datetime is first correctly transformed to a unix timestamp, but is then displayed in bytes format instead of datetime. Using {%F} as formatting string displays the full unix timestamp.

The x-axis displays the datetime correctly, so I assume it doesn't have to do with importing DatetimeTickFormatter.

I followed Configure Plot Tools to implement the tooltip.

Possibly related to this issue on pyviz holoviews

Complete, minimal, self-contained example code that reproduces the issue

from datetime import datetime

from bokeh.models import ColumnDataSource, HoverTool
from bokeh.plotting import figure
from bokeh.io import curdoc

dts = ['19/05/2017 13:39', '20/05/2017 13:34', '21/05/2017 13:28', '22/05/2017 13:27', '23/05/2017 13:12',
       '24/05/2017 13:11', '25/05/2017 13:10', '26/05/2017 11:47', '27/05/2017 11:46', '28/05/2017 11:45',
       '29/05/2017 11:41']
dt = [datetime.strptime(x, '%d/%m/%Y %H:%M') for x in dts]
val = [1.004, 0.915, 0.944, 1.023, 1.075, 0.971, 0.958, 0.969, 1.079, 1.112, 0.999]

source = ColumnDataSource(data={'x': dt, 'y': val})

# @x{%F} doesn't work either
hover_tool = HoverTool(tooltips=[('Timestamp', '@x{%Y%m%d %H:%M}'), ('Value', '@y')],
                       formatters={'Timestamp': 'datetime'},)

plot = figure(title='hover_datetime', x_axis_type='datetime', toolbar_location='above',)
s = plot.scatter(x='x', y='y', source=source)
plot.add_tools(hover_tool)

curdoc().add_root(plot)

Stack traceback and/or browser JavaScript console output

Nothing...

Screenshots or screencasts of the bug in action

[bryevdv]

@YMRTN this is a usage error, the key in the formatter dict should refer to the column name:

 formatters={'x': 'datetime'}

[cmdavidson546]

@bryevdv I actually need to add '@' before the column name in formatters in order to get this to work for me:
formatters={'@x': 'datetime'}

It worked fine once I did that.

[bryevdv]

@cmdavidson546 what I put above used to work, we made it more strict since I posted it

[Material-Scientist]

Could you explain how it works now?

The following still doesn't work for me:

p.add_tools(HoverTool(
    tooltips=[
        ("date",  "$x{%F}"),
        ("price", "$y{"+f"0.00"+" a}"),
        ("value", "@image{0,0.00}"),
    ],

    formatters={
        "date"      : "datetime"
    },
))

*Edit
Nevermind, the following works:

p.add_tools(HoverTool(
    tooltips=[
        ( "date",  "$x{%F}"            ),
        ( "price", "$y{"+f"0.00"+" a}" ),
        ( "value", "@image{0,0.00}"      ),
    ],

    formatters={
        '$x'      : 'datetime', # use 'datetime' formatter for 'date' field
    },

    # display a tooltip whenever the cursor is vertically in line with a glyph
#     mode='vline'
))

[bryevdv]

@Material-Scientist the key in the formatters dict must match either a column name specification including the @-symbol (e.g. @x) or one of the "special" variables including the $-symbol (e.g $y). It is not the label from the hover tooltip (e.g. "date") and the reason for this is a label may correspond to several fields or special variables, and it may be desired to format all of them independently.

Also: in the future, please make sure to take "how do I" support-type questions to the Discourse, not the issue tracker:

https://discourse.bokeh.org

[github-actions]

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