1. Edit the existing Saved Search
2. Under Results tab > Add Formula(Text)
3. Under the Formula column: TO_CHAR({xxxx}, 'YYYY-MM-DD')
Note: The xxxx is the internal ID of the custom date field.
4. Under the Custom Label column, enter a name here to be displayed on the search results.
5. Click Save & Run
for example
var customrecord_jj_notificationSearch = nlapiSearchRecord("customrecord_jj_notification", null,
[
["custrecord_jj_notification_customer", "anyof", field.internalid]
],
[
new nlobjSearchColumn("custrecord_jj_message"),
new nlobjSearchColumn("custrecord_jj_message_subject"),
new nlobjSearchColumn("formulatext").setFormula("TO_CHAR({custrecord_jj_notification_date} , 'YYYY-MM-DD')").setSort(true),
]
);