how to add placeholder to ADM-dateTimePicker

[LenWhims]

How can I add placeholder to ADM-dateTimePicker?
<adm-dtp class="datetime-picker" ng-model='fromDate' options='{format: "YYYY/MM/DD", autoClose:true}'></adm-dtp>

[Rouhollah]

if you want show anything else from datetime ,use placeholder and options at same time like below:
<adm-dtp ng-model="filters.FromDate" options="{default:''}" placeholder="test"></adm-dtp>