make time calculations timezone independent (and thus more portable) (#1337)

[ylfingr]

Time calculations have been done locale-dependent which lead to different
expiration dates.
You can view, comment on, or merge this pull request online at:

  https://github.com/monitoring-plugins/monitoring-plugins/pull/1337

-- Commit Summary --

  * make time calculations timezone independent (and thus more portable)

-- File Changes --

    M plugins/sslutils.c (20)

-- Patch Links --

https://github.com/monitoring-plugins/monitoring-plugins/pull/1337.patch
https://github.com/monitoring-plugins/monitoring-plugins/pull/1337.diff

-- 
Reply to this email on GitHub:
https://github.com/monitoring-plugins/monitoring-plugins/pull/1337
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