[metrics-bugs] #24635 [Metrics/Website]: Use date and timestamp classes for calculations etc.

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#24635: Use date and timestamp classes for calculations etc.
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     Reporter:  iwakeh           |      Owner:  metrics-team
         Type:  enhancement      |     Status:  new
     Priority:  Medium           |  Milestone:
    Component:  Metrics/Website  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 See #24260 comment 14 for details.

 Also try finding a way to add tests here.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24635>
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