Hi,
you can use this css -
.DatePlace:before {
content: attr(placeholder) !important;
color: #aaa;
margin-right: 0.1em;
width: 100%;
}
.DatePlace:focus:before,
.DatePlace:valid:before {
content: "";
}
after that add a condition on style class property of date input widget like
If(DateVar=NullDate(),"DatePlace","form-control")
Hope this will help you.
Regards
Rahul