Update Modified field in Office 365 - sharepoint

Question

Is there any way to update the Modified field in Office 365? I have checked both CSOM and Batch update methods. But it's failed. Could anybody help me to update this field.

Answer 1

Before attempting to set Modified, Created, Editor, and Author fields for a list item you need to disable a couple of properties on the List, specifically EnableVersioning and for good measure ForceCheckout.
SharePoint Online prerequisite is the SharePointOnline CSOM:
.NET client API reference for SharePoint Online
Nuget - Microsoft.SharePointOnline.CSOM
using (var context = new ClientContext(webUrl))
{
context.Credentials = new SharePointOnlineCredentials(userName,password);
var list = context.Web.Lists.GetByTitle(listTitle);
var item = list.GetItemById(itemID);
var user = context.Web.EnsureUser(accountName);
context.Load(user);
context.Load(list);
context.Load(item);
context.ExecuteQuery();
// If the properties are enabled on the list then disable them
bool updateList = list.ForceCheckout || list.EnableVersioning;
if (list.ForceCheckout) list.ForceCheckout = false;
if (list.EnableVersioning) list.EnableVersioning = false;
if (updateList)
{
list.Update();
context.ExecuteQuery();
}
// Now set the fields that are normally locked
item["Modified"] = DateTime.Now;
item["Created"] = DateTime.Now.AddDays(-3);
item["Author"] = user.Id;
item["Editor"] = user.Id;
item.Update();
context.ExecuteQuery();
}

Answer 2

SharePoint CSOM API does not support system update (SystemUpdate method counterpart from SSOM API) but you could manipulate system fields like Modified By and Modified fields directly as demonstrated below.
Prerequisites: SharePoint Server 2013 Client Components SDK
using (var ctx = GetContext(webUri, userName, password))
{
//get List Item
var list = ctx.Web.Lists.GetByTitle(listTitle);
var item = list.GetItemById(itemId);
//Retrieve User
var user = ctx.Web.EnsureUser(accountName);
ctx.Load(user);
ctx.ExecuteQuery();
//Update system fields
item["Modified"] = DateTime.Now.AddMonths(-6);
item["Created"] = DateTime.Now.AddYears(-1);
item["Editor"] = user.Id;
item["Author"] = user.Id;
item.Update();
ctx.ExecuteQuery();
}
where
public static ClientContext GetContext(Uri webUri, string userName, string password)
{
var securePassword = new SecureString();
foreach (var ch in password) securePassword.AppendChar(ch);
return new ClientContext(webUri) { Credentials = new SharePointOnlineCredentials(userName, securePassword) };
}

Answer 3

SharePoint CSOM API now support system update using UpdateOverwriteVersion method. This way you can modify Modified, Created, Author and Editor properties without changing the item Version. For example:
$file = Get-PnPFile -Url $FileUrl -AsListItem
##update file properties
$item["Modified"] = $FileModifiedDate
$item["Created"] = $FileCreatedDate
$item["Author"] = $FileCreatedByDest.ID
$item["Editor"] = $FileModifiedByDest.ID
$fileTest2.UpdateOverwriteVersion()
Invoke-PnPQuery
That should do the trick.