[tor-bugs] #24870 [Metrics/Onionoo]: Use java 8 date-time functionality in Onionoo

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#24870: Use java 8 date-time functionality in Onionoo
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 Reporter:  iwakeh           |          Owner:  metrics-team
     Type:  enhancement      |         Status:  new
 Priority:  Medium           |      Milestone:
Component:  Metrics/Onionoo  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  metrics-2018     |  Actual Points:
Parent ID:  #23752           |         Points:
 Reviewer:                   |        Sponsor:
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Comment (by karsten):

 Note: #24296 contains some discussion on using `ZonedDateTime` rather than
 `long` or `String` for timestamps.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24870#comment:2>
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