How do I set language of datetime axis in bokeh?
Question
I have trouble with setting language in which datetime axis is formatted in bokeh . According to documentation , DatetimeTickFormatter produces time ticks 'according to the current locale' . However, whatever locale I set in Python, I get a plot formatted in English:
# jupyter notebook
import locale
locale.setlocale(locale.LC_ALL, 'pl')
import random
from datetime import datetime, date
from bokeh.plotting import figure, show
from bokeh.io import output_notebook
from bokeh.models.formatters import DatetimeTickFormatter
output_notebook()
x_values = [datetime(2018, i, 1) for i in range(6, 13)]
y_values = [random.normalvariate(0, 1) for i in range(6, 13)]
p = figure(plot_width=600, plot_height=300,
x_axis_type='datetime', title="test",
x_axis_label='x test', y_axis_label='y test')
p.line(
x=x_values,
y=y_values
)
p.xaxis.formatter = DatetimeTickFormatter(months = '%B')
show(p)
If that's relevant, global system locale is set to en-US :
PS C:\Users\ppatrzyk> GET-WinSystemLocale
LCID Name DisplayName
---- ---- -----------
1033 en-US English (United States)
I am working with plots in multiple languages so I need to change locale on the fly . Doing that through locale.setlocale has worked fine for me with both printing dates to console and with matplotlib . How can I set it in bokeh such that dates are formatted correctly?
EDIT :
The best workaround I got is to plot dates as numeric axis (unix timestamp) and then use major_label_overrides to replace ticks with correctly formatted dates obtained from python's datetime.strftime() . However, in this case zooming to ticks in between data points is broken, so this is far from being a satisfactory solution :
x_values = [datetime(2018, i, 1) for i in range(6, 13)]
y_values = [random.normalvariate(0, 1) for i in range(6, 13)]
x_values_timestamp = [int(el.timestamp()) for el in x_values]
x_values_labels = [el.strftime('%B') for el in x_values]
p = figure(plot_width=600, plot_height=300, title="test",
x_axis_label='x test', y_axis_label='y test')
p.xaxis.ticker = x_values_timestamp
p.xaxis.major_label_overrides = dict(zip(x_values_timestamp, x_values_labels))
p.line(
x=x_values_timestamp,
y=y_values
)
show(p)
1 answers
solution1
0 2022-05-10 11:05:13
I faced the same problem as I wanted the dates be displayed in portuguese of Portugal (pt-PT).
I found out that bokeh uses the file https://cdn.bokeh.org/bokeh/release/bokeh-2.4.2.min.js to set the datetime language.
In my case, I wanted to generate standalone .html files, so I opted to set mode = 'inline' when exporting the file ( output_file('test.html', mode = 'inline') ) to embed the .js into the .html . But I assume that it should be possible to make the .html file load a custom bokeh-2.4.2.min.js by changing its path in the .html <head></head> .
To solve my problem, I edited the exported .html (edit the custom .js if you don't choose mode = 'inline' ) and replaced the following strings:
find = 'locale:"en_US"'
replace = 'locale:"pt_PT"'
find = 'en_US:{date:"%m/%d/%Y",time24:"%I:%M:%S %p",time12:"%I:%M:%S %p",dateTime:"%a %d %b %Y %I:%M:%S %p %Z",meridiem:["AM","PM"],month:{abbrev:"Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec".split("|"),full:"January|February|March|April|May|June|July|August|September|October|November|December".split("|")},day:{abbrev:"Sun|Mon|Tue|Wed|Thu|Fri|Sat".split("|"),full:"Sunday|Monday|Tuesday|Wednesday|Thursday|Friday|Saturday".split("|")}}'
replace = 'pt_PT:{date:"%d/%m/%Y",time24:"%H:%M:%S",time12:"%I:%M:%S %p",dateTime:"%a %d %b %Y %H:%M:%S %Z",meridiem:["AM","PM"],month:{abbrev:"Jan|Fev|Mar|Abr|Mai|Jun|Jul|Ago|Set|Out|Nov|Dez".split("|"),full:"Janeiro|Fevereiro|Março|Abril|Maio|Junho|Julho|Agosto|Setembro|Outubro|Novembro|Dezembro".split("|")},day:{abbrev:"Dom|Seg|Ter|Qua|Qui|Sex|Sáb".split("|"),full:"Domingo|Segunda-feira|Terça-feira|Quarta-feira|Quinta-feira|Sexta-feira|Sábado".split("|")}}'
find = 'u="Sunday|Monday|Tuesday|Wednesday|Thursday|Friday|Saturday|year|month|day|hour|minute|second|millisecond"'
replace = 'u="Domingo|Segunda-feira|Terça-feira|Quarta-feira|Quinta-feira|Sexta-feira|Sábado|ano|mês|dia|hora|minuto|segundo|milissegundo"'
I hope this helps anyone facing this "issue".
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