correct date format

[dxuhuang]

@benblack86 @DanSimon @jlbelmonte @aliyakamercan @amotamed

https://github.com/tumblr/colossus/issues/604

[codecov-io]

Codecov Report

Merging #606 into develop will increase coverage by 0.08%. The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #606      +/-   ##
===========================================
+ Coverage    84.79%   84.88%   +0.08%     
===========================================
  Files           98       99       +1     
  Lines         4388     4452      +64     
  Branches       361      363       +2     
===========================================
+ Hits          3721     3779      +58     
- Misses         667      673       +6

Impacted Files	Coverage Δ
...rc/main/scala/colossus/protocols/http/Header.scala	84.11% <100%> (+0.58%)	:arrow_up:
...src/main/scala/colossus/metrics/MetricSystem.scala	93.18% <0%> (-2.06%)	:arrow_down:
...s/src/main/scala/colossus/service/ServiceDSL.scala	85.41% <0%> (-1.82%)	:arrow_down:
...ssus/src/main/scala/colossus/core/Connection.scala	68.18% <0%> (-1.59%)	:arrow_down:
...in/scala/colossus/controller/InputController.scala	86.04% <0%> (-1.14%)	:arrow_down:
...rc/main/scala/colossus/service/ServiceClient.scala	91.6% <0%> (-0.65%)	:arrow_down:
...in/scala/colossus/protocols/memcache/package.scala	100% <0%> (ø)
...lossus/src/main/scala/colossus/core/Pipeline.scala	97.95% <0%> (+0.04%)	:arrow_up:
.../scala/colossus/metrics/collectors/Histogram.scala	90.57% <0%> (+0.06%)	:arrow_up:
...rc/main/scala/colossus/service/ServiceServer.scala	90.83% <0%> (+0.07%)	:arrow_up:
... and 10 more

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[benblack86]

Can we get a test?