Sitefinity Classic Editor DateTime format

Issues

• Content Edit Page – Show mm/dd/yyyy

• Content Listing Page – Show unknown (AM / PM) time

What I did to resolve it?

1. Add a new ViewMap Control

Advanced Settings → Controls → ViewMap → <Create new>
HostType: Telerik.Sitefinity.Web.UI.Fields.DateField, Telerik.Sitefinity
Layout: ~/Utils/Extensions/DateFieldExtended.ascx

Sample: GitHub Gist - hawjeh/sample sitefinity classic editor datetime

2. Update Content Type Listing DateTime Format

Advanced Setting → DynamicModules → Controls → <Custom Module Backend Definition> 

→ Views → <Module Backend List> → View Modes → Grid → Columns → <Field> → Client Template →

<span>{{ (Start) ? Start.sitefinityLocaleFormat(‘dd/MM/yyyy hh:mm tt’): ‘-‘ }}</span>

3. Do for LastModified, DateCreated fields too.

Resolved Screen

• Content Edit Screen

• Content Listing Screen

References

• Sitefinity Community Article 1
• Sitefinity Community Article 1