How set Italian date (day mounth year ) in the figure(.. x_axis_type='datetime',..)

mauroDia · May 29, 2023, 8:55am

I would like to be able to define a date in the Italian format (yyyy/mmdd)

p=figure(name=nomeOggetto,x_axis_type=‘datetime’,y_range=listaItemDistinct,
x_range=Range1d(dataFrame.Start_dt.min(),dataFrame.End_dt.max()),
tools=[hover,toolsDef])

KInd regards
Mauro

Bryan · May 31, 2023, 4:19am

All of the scales of DatetimeTickFormatter can be configured using the format codes listed in the docs:

https://docs.bokeh.org/en/latest/docs/reference/models/formatters.html#bokeh.models.DatetimeTickFormatter

It seems like you’d want a format string like "%Y/%m%d"

mauroDia · May 31, 2023, 9:47am

Thanks YOU, this works very fine:
p.xaxis.formatter = DatetimeTickFormatter(microseconds = ‘%fus’
,milliseconds = ‘%3Nms’
,seconds = ‘%Ss’
,minsec = ‘:%M:%S’
,minutes = ‘:%M’
,hourmin = ‘%H:%M’
,hours = ‘%Hh’
,days = ‘%d/%b’
,months = ‘%b/%Y’
,years = ‘%Y’)
Only one things: the name of the mounths is in English, can I translate in Italian?
Kind regards
Mauro

Bryan · May 31, 2023, 3:13pm

Bokeh uses the timezone library internally to process the format:

github.com

bokeh/bokeh/blob/fb8f334dd1ace3c818d50322468f2b8224f0c165/bokehjs/src/lib/models/formatters/datetime_tick_formatter.ts#L85


      
            format = format.replace(/((^|[^%])(%%)*)%f/, microsecond_replacement_string)
          
            // timezone seems to ignore any strings without any formatting directives,
            // and just return the time argument back instead of the string argument.
            // But we want the string argument, in case a user supplies a format string
            // which doesn't contain a formatting directive or is only using %f.
            if (format.indexOf("%") == -1) {
              return format
            }
          
            return tz(t, format)
          }
          
          export function _us(t: number): number {
            // From double-precision unix (millisecond) timestamp, get microseconds since
            // last second. Precision seems to run out around the hundreds of nanoseconds
            // scale, so rounding to the nearest microsecond should round to a nice
            // microsecond / millisecond tick.
            return Math.round(((t / 1000) % 1) * 1000000)
          }

It appears that timezone might support different localizations. I am not sure if that support is always built-in or requires additional resource bundles to function. Either way, we could potentially expose the locale property and pass it to timezeone but that would be future development. I’d encourage you to open a GitHub Issue about it.

In the mean time, I think you would need to use CustomJSHover to format manually for now. (Note, if you try this route, that datetime axis values are represented as floating point milliseconds-since-epoch).

system · August 29, 2023, 3:14pm

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