[web2py] Submit gutton in fields

[Rick]

Hi,
How to change the text on the submit button in fields? Here'sthe code:

Field('thedate', 'date', label=T(''),
widget=SQLFORM.widgets.date.widget))

I tried with this, but i didn't work:
Field('thedate', 'date', label=T(''),
submit=INPUT(_type='submit'('Some text')),
widget=SQLFORM.widgets.date.widget))

Thanks in advance for help!