How to Add Date Time Field to SharePoint List using PowerShell?

Requirement: Add Date and Time Column to SharePoint list using PowerShell.


PowerShell Script to add Date time Column to SharePoint list:

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

#Processing Variables
$WebURL="http://portal.crescent.com/sites/Sales"
$ListName="Vendors"
$FieldName="Date of Contract"
$RequiredField=$false

#Get Objects
$Web = Get-SPWeb $WebURL
$List= $Web.Lists[$ListName]

#Add Date and Time Column
$List.Fields.Add($FieldName,"DateTime", $RequiredField)

This Adds a new field.

Set Date Time Column Settings using PowerShell: 
While the above code adds new field to given list, there are additional settings on the column such as: Display Format, Default Value, etc can be set using PowerShell.
PowerShell to Update Date Time Column Settings:

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

#Processing Variables
$WebURL="http://portal.crescent.com/sites/Sales"
$ListName="Vendors"
$FieldName="Date of Contract"

#Get Objects
$Web = Get-SPWeb $WebURL
$List= $Web.Lists[$ListName]

#Set Column Settings
$List.Fields[$FieldName].Description = "Enter Date of Join”

#Enforce unique
$List.Fields[$FieldName].EnforceUniqueValues = $false

#Required
$List.Fields[$FieldName].Required = $true

#Date Time Display Format 
$List.Fields[$FieldName].DisplayFormat = "DateOnly"

#Default Value
#$List.Fields[$FieldName].DefaultValue="[today]

#Formula
$List.Fields[$FieldName].DefaultFormula = "=[Today]+7"

#Friendly Display Format
$List.Fields[$FieldName].FriendlyDisplayFormat="Disabled"

$List.Fields[$FieldName].update()

Refer this MSDN link for the complete field properties reference: SPFieldDateTime properties