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Date and Time Guides

Practical, well-researched guides about calendars, clocks, time zones, and the math behind our tools.

When Does Daylight Saving Time End in 2027?

Daylight saving time ends on Sunday, November 7, 2027 at 2:00 AM. Here is the 2027 US schedule, which states skip it, and what changes.

What are time zones, how do UTC and GMT differ, and what is daylight saving? A plain-language guide with practical conversion tips.

Is it 365 or 366 days in a year? Learn when each applies, how leap years decide it, and why the answer matters for age and date math.

Learn the manual method for counting days between dates, when to include the end date, and the common mistakes that throw counts off by one day.

Confused by 12-hour and 24-hour time? Learn how AM/PM works, how to convert between the two systems, and the tricky cases like 12 AM and 12 PM.

Why does February sometimes have 29 days? Learn the three leap year rules, why leap years exist, and how they affect age and date calculations.

Learn how to calculate your exact age by hand. Step-by-step method with a worked example, plus how leap years and month lengths affect the result.