The "Date" you see in History tab for each version is get from[ sf_VersionItem] table. We cast the value to ToLocalTime(). This is the date when the VersionItem has been created. DateModified is updated when you Publish the item, but this does not create a new version.
The values of Date and DateModifed are equivalent only when you create the item for the first time - so there is only one version of the item. Once you publish the item the DateModified gets updated.
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the Telerik team
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