Hi @juan.fonseca,
Welcome to Plotly forum!
The letters v, h in the names of interpolation type stand for vertical, respectively horizontal. Each one of the combinations of v and h is illustrated at the link you gave above, in the section Interpolation with Line Plots.
You can interpolate your data using your own method and finally pass the x and y lists of interpolated data to go.Scatter. To get displayed your prefered datetime format you can set xaxis_tickvals, respectively xaxis_ticktext, as it is illustrated in the answer to this forum question https://community.plotly.com/t/quiver-plot-with-datetime-x-axis/28972/2.
i.e. no matter what kind of data you have in the go.Scatter.x, you can ensure to be displayed custom ticklabels, mapping the default tickvalues to the list xaxis_tickvals, and setting as ticklabels the strings in xaxis_ticktext.