DevConf.cz 2018 has ended

DevConf.cz 2018 is the 10th annual, free, Red Hat sponsored community conference for developers, admins, DevOps engineers, testers, documentation writers and other contributors to open source technologies such as Linux, Middleware, Virtualization, Storage, Cloud and mobile where FLOSS communities sync, share, and hack on upstream projects together in the beautiful city of Brno, Czech Republic.

When: Friday, January 26 to Sunday, January 28, 2018

Venue: Faculty of Information Technology (VUT FIT - Božetěchova 2, Brno)


  • Friday 17:15: at the venue there will be a surprise show, stick around!
  • Saturday 19:00: the social event starts at Fleda Club. TICKET IS REQUIRED. Tickets will be distributed each day at check-in. First come, first serve.
  • Sunday 17:00: there will be many prizes given away at the closing session.
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Friday, January 26 • 11:00am - 11:23am
Astounding time madness

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Limited Capacity seats available

"Dealing with date and time in code is complicated because numbers are all odd. A day has 86400 seconds, months have between 28 and 31 days, and so on. Leap years, leap seconds and DST add to complexity.

In fact it's even more complicated. Not only sun and moon influence our calendar system but also math, politics, religion, relativity theory, tidal range, and even Caesar's love for Cleopatra have an impact. Did you ever wonder why a minute has 60 seconds? Why Eastern and Ramadan are always on different dates? Why do we need leap seconds, astronomers UT1 and UT1R besides UTC? What's up with 11 missing days in September of 1752 in some countries or Chicago's time zone "18:09:00 STD, LMT-1"?

My talk will shed some light on time and calendar systems."

avatar for Christian Heimes

Christian Heimes

Principal Software Engineer, Red Hat
Christian is a long time Python developer from Hamburg/Germany and contributor to several Open Source projects such as the CPython interpreter. In the past years he has helped to keep Python secure, for example as member of the Python security response te

Friday January 26, 2018 11:00am - 11:23am CET
H-E112 Faculty of Information Technology (VUT FIT)
  Development, Presentation