[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           |   Keywords:  metrics-2018
Actual Points:                   |  Parent ID:  #23752
       Points:                   |   Reviewer:
      Sponsor:                   |
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 This affects documents and updater code.  The changes should strive to
 shorten existing code, make it more readable, and remove helper constants
 and classes currently used for time conversions/calculations.

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