Inconsistency between dates in branches and commit details

Summary

Branches list shows last commit's commit date (as defined by git) for the "Last update" column, but in commit details view you can see only the author date (as defined by git), but not the commit date.

Steps to reproduce

Head to Repository => Branches tab and compare with Commits tab

What is the current bug behavior?

The dates are inconsistent

What is the expected correct behavior?

Both should show the same date

Relevant logs and/or screenshots

Pasted_Image_4_10_17__5_28_PM

Pasted_Image_4_10_17__5_30_PM

https://gitlab.zendesk.com/agent/tickets/72210

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