datetime_tick_context#
from bokeh.models import RELATIVE_DATETIME_CONTEXT
from bokeh.plotting import figure, show
from bokeh.sampledata.glucose import data
x = data.loc['2010-10-06'].index.to_series()
y = data.loc['2010-10-06']['glucose']
p = figure(sizing_mode="stretch_width", x_axis_type="datetime",
tools="xwheel_zoom")
p.xaxis.formatter.context = RELATIVE_DATETIME_CONTEXT()
p.line(x, y, line_dash="4 4", line_width=3, color='gray')
show(p)