import datetime as dt
import panel as pn

pn.extension()

time_picker = pn.widgets.TimePicker(name='Time Picker', value=dt.datetime.now().time(), format='H:i K')
time_picker

time_picker = pn.widgets.TimePicker(name='Time Picker', value="08:28", start='00:00', end='12:00')
time_picker