Explore the critical importance of time synchronization in modern technology during this 45-minute conference talk from ShowMeCon 2019. Delve into various aspects of timekeeping, including time zones, Internet of Things, NTP, and UTC. Learn about the challenges posed by leap seconds and their impact on systems like Google. Examine the vulnerabilities of GPS and GNSS technologies, including jamming and its potential for disruption in various sectors. Investigate the root causes of time-related issues and their estimated impact on systems. Discover emerging concepts like quantum entanglement and coordinated activity in relation to timekeeping. Conclude with a Q&A session to address audience inquiries on this crucial yet often overlooked aspect of technology infrastructure.