I can't send "Date of Birth" field use "Contacts"

I can't send "Date of Birth" field use "Contacts"

Hello,

I have problem with send "Date of Birth":

I try to send (insert or update) data like below:

<Contacts>

<row no="1">

<FL val="First Name"></FL>

<FL val="Last Name">N14745</FL>

<FL val="Email"> daro@itur.pl</FL>

<FL val="Date of Birth">12.03.2016</FL>

<FL val="Phone">48506836817</FL>

<FL val="Other Phone"></FL>

<FL val="Mailing Street"></FL>

<FL val="Mailing City"></FL>

<FL val="Mailing Zip"></FL>

<FL val="Mailing Country"></FL>

<FL val="Account Name">N-nowe</FL>

</row>

</Contacts>

Field "Date of Birth" is not save after sent.

When I try to get this record I received data without "Date of Birth". Other fields are changed.

I try to use few data formats but it still doesn't work.

Can you help me ?