Add date to AD attribute ExtensionAttributeC24

Hi Experts,

Need some assistance.


I have an Outbound Sync Rule and through that I want to write EmployeeStartDate to an attribute in AD called ExtensionAttributeC24 which is date time attribute.

I tried multiple permutations and combinations of using string, custom functions but I always end up getting " Syntax-violation" on AD MA Export.

Connected Data Source Error Code : 87

Connected Data Source Error: The parameter is incorrect.

I am stuck here, please suggest a way through. 
Please note that I am using Sync Rule .

Thank You,
Parin Das