Fix crash with time command

[synfinatic]

• use RFC3339
• Use a 10 year cert for testing

Fixes: #1008

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.

Project coverage is 84.61%. Comparing base (647bc5f) to head (1ec6206).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1010   +/-   ##
=======================================
  Coverage   84.61%   84.61%           
=======================================
  Files          34       34           
  Lines        3040     3040           
=======================================
  Hits         2572     2572           
  Misses        375      375           
  Partials       93       93           

Flag	Coverage Δ
unittests	84.61% <92.86%> (ø)

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Files	Coverage Δ
internal/sso/settings.go	77.36% <ø> (ø)
internal/utils/utils.go	96.12% <92.86%> (ø)

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