Search by date with jqgrid - jqgrid

Question

I am working with Jqgrid on C# and I have an issue when I try
to search by Date because the field 'fecha' in the colModel is a Datetime on the Entity
so, the value that the grid get from json looks like: /Date(1514869200000)/
but with the "formatter: 'date'" the value looks like: 02/01/2018.
When I try to search, the field search by the original value (/Date(1514869200000))
and no as a Date that is that I want
Sorry for my bad English, I hope someone understand me.
Here is my .js
$(function () {
$('#grid').jqGrid({
url: "/Empleados/BuscarEmpleados",
datatype: 'json',
mtype: 'Get',
colNames: ['ID', 'Nombre', 'Cargo', 'Móvil', 'Fecha Inicio', 'Estado', 'Opciones'],
colModel: [
{ label: "ID", key: true, name: 'id', index: 'id', width: '100px' },
{ label: 'Nombre', name: 'nombre', index: 'nombre', width: '280px', searchoptions: { sopt: ['cn', 'eq'] } },
{ label: 'Cargo', name: 'cargo', index: 'cargo', width: '160px', searchoptions: { sopt: ['cn', 'eq'] } },
{ label: 'Movil', name: 'movil', index: 'movil', width: '140px', searchoptions: { sopt: ['cn', 'eq'] } },
{ label: 'Fecha Inicio', name: 'fecha', index: 'fecha', formatter: 'date',
formatoptions: { newformat: 'd/m/Y', srcformat: 'd/m/Y' }, searchoptions: { sopt: ['cn', 'eq', 'gt'] }, width: '150px' },
{ name: 'estado', index: 'estado', width: '155px', search: false },
{ name: 'Opciones', index: 'Opciones', formatter: OpcionesEmpleado, search: false, width: '300px' }
],
pager: jQuery('#pager'),
rowNum: 10,
rowList: [10, 20, 30, 40],
height: "100%",
viewRecords: true,
loadonce: true,
caption: "Empleados",
emptyRecords: "No se han encontrado coincidencias",
jsonReader: {
root: "rows",
page: "page",
total: "total",
records: "records",
repeatitems: false
},
autowidth: true,
multiselect: false,
}).navGrid('#pager', {
edit: false,
add: false,
del: false,
search: true,
refresh: true
});

Answer 1

You need to add
sorttype: "date"
property to the definition of the column fecha (the column with the date).