Plotly, Python. Can i plot vertical line based on a datetime object?

Question

I am forecasting Covid cases and using Plotly for visualization. I would like to plot a straight vertical line in place where forecast starts. I have a chart like this. chart. I just want to plot a vertical line on date 25 Jan 2021, so it is visible where forecast starts.

Answer 1

I managed to make it work with text annotations by converting it back to milliseconds as suggested here

Here is the example code:

import plotly.express as px
import datetime
df = px.data.stocks(indexed=True)
fig = px.line(df)
fig.add_vline(x=datetime.datetime.strptime("2018-09-24", "%Y-%m-%d").timestamp() * 1000, annotation_text="test" )
fig.show()