Use standard library UTC

[akx]

No description provided.

[codecov]

Codecov Report

Merging #957 (a4ae42e) into master (2c1875e) will decrease coverage by 0.26%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #957      +/-   ##
==========================================
- Coverage   90.50%   90.24%   -0.26%     
==========================================
  Files          25       25              
  Lines        4401     4397       -4     
==========================================
- Hits         3983     3968      -15     
- Misses        418      429      +11     

Impacted Files	Coverage Δ
babel/dates.py	84.26% <100.00%> (-0.72%)	⬇️
babel/localtime/_helpers.py	42.30% <0.00%> (-19.24%)	⬇️
babel/localedata.py	95.16% <0.00%> (-0.81%)	⬇️
babel/messages/catalog.py	95.50% <0.00%> (-0.03%)	⬇️

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