i must find all cases where MYDATE > A SPECIFIC DATE

i write in custom function

crmResp = zoho.crm.searchRecords("Cases", "(MYDATE|>|newDate)",0,200);

MYDATE = yyyy-MM-dd

newDate = yyyy-MM-dd

But i have 0 response, in my CRM i have 46 results. 

The criteria not work with date ?

thanks you