NF2010. "Date/Time control" - HowTo shows the first day of week as Monday instead of Sunday

Hello Guys,

I have quick question regarding Nintex Forms 2010 because I can’t find an answer.
Do you know how to change “Date/Time control” to show in calendar preview the first day of week as Monday instead of Sunday?

By default Nintex is showing Sunday as first day of week. On the same site I have another list with default SharePoint form and week is starting from Monday.
Site regional settings are set as below:
Define Your Work Week / First day of week: Monday

Google shows some part of sentence from NF2010_version_history.pdf, but can’t find this info in document:
The first day of the week in a Date control is now synched with the site's (..)

Any support would be more than welcome.