RFR: 7904067: Include the millisecond part in the start and end times reported in each action's section

[Jaikiran Pai]

On Sat, 23 Aug 2025 11:02:57 GMT, Jaikiran Pai <jpai at openjdk.org> wrote:

> Can I please get a review of this trivial change which updates the reporting of start and end dates of each action to also include the millisecond part? 
> 
> As noted in https://bugs.openjdk.org/browse/CODETOOLS-7904067, this detail can sometimes help during debugging when comparing other log files which typically have the millisecond part.
> 
> Existing self tests continue to pass with this change.

Thank you Christian for the review.

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PR Comment: https://git.openjdk.org/jtreg/pull/275#issuecomment-3218577732