Falsehoods programmers believe about time and time zones

• Every day has 24 hours
• Every day without DST changes is 86400 (60 * 60 * 24) seconds long
• Every day in UTC is 86400 (60 * 60 * 24) seconds long
• Week one of a year starts in January every year
• If I know what time zone someone is in and they just tell me the date and local time, I can always use software to find out what time that is in UTC
• DST always sets the clock back and forth by exactly one hour
• Countries that observe DST begin observing DST in the first half of the year and end observing DST in the last half of the year
• …

Be sure to click through and read a few more falsehoods, along with their explanations.

Falsehoods programmers believe about time and time zones →