24hourto12hour.com · Blog

Guides to reading, converting, and calculating time

Time sounds simple until a 12:00 PM deadline, a 1430 departure, or a decimal-hours timesheet makes you stop and second-guess. These guides clear up every corner of it — and always show the method, so the answer sticks.

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Two people can look at the same moment and write it two completely different ways — 2:30 PM or 14:30, 7:00 AM or 0700. Add time zones, payroll rounding, and Unix timestamps on top, and "what time is it, really?" turns into a surprisingly deep question. This blog answers it, one clear guide at a time.

Everything here is written to be understood, not just skimmed: real worked examples, printable charts, and the reasoning behind each rule, so you can work the next one out yourself. Start with a category below, jump to a popular guide, or skip straight to the tool that does the job for you.

New here? Start with this

The 12-Hour vs 24-Hour Clock guide is the cornerstone of the whole blog — it explains both clock formats and how to move between them, and everything else builds on it.

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Eight topics, each with its own hub listing every guide inside it.

01 Reading the Clock The 12-hour and 24-hour clocks, AM vs PM, and how to convert between them. 02 Military Time What military time is, how to read and say it, and who actually uses it. 03 Time Zones, UTC, GMT & DST UTC and GMT, zone abbreviations, daylight saving, and scheduling across zones. 04 Work Hours, Payroll & Timesheets Calculate hours worked, overtime, decimal hours, and weekly timesheets. 05 Time Math & Duration Work out durations, elapsed time, and business days between two dates. 06 Time Units & Conversions Convert minutes, hours, seconds, days, and weeks with confidence. 07 Developer Time & Timestamps Unix timestamps, epoch time, ISO 8601, and cron expressions, explained. 08 Productivity, Timers & Scheduling Pomodoro, sleep cycles, focus timers, and planning your day by the hour.
Reading the Clock 12-Hour vs 24-Hour Clock: The Complete Guide How both formats work and how to convert between them — the cornerstone explainer. Military Time What Is Military Time? A Complete Beginner's Guide How the 24-hour military clock works, how to read it, and how to say it aloud. Payroll How to Calculate Hours Worked (With Examples) Turn clock-in and clock-out times into paid hours, including breaks and overtime. Time Zones UTC vs GMT: What's the Difference? What each term really means, why they're not quite the same, and when it matters. Developer What Is a Unix Timestamp? A Developer's Guide Epoch time explained in plain terms, with how to read and convert a timestamp. Productivity The Pomodoro Technique: A Complete Beginner's Guide How the 25-minute focus method works and how to run it with a simple timer.

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55+ free, in-browser time tools — converters, calculators, timers, and charts. No sign-up, nothing stored.

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Fletcher Langley

Written & reviewed by Fletcher Langley

Time & Scheduling Specialist · 24hourto12hour.com

Operations and workforce-systems specialist with 14+ years inside shift-based industries and payroll platforms. Fletcher builds and reviews every tool and guide on the site, and writes so the method is always shown — not just the answer. Read the editorial policy or his full profile.

About this blog

Who writes the guides on this blog?

Every guide is written and reviewed by Fletcher Langley, a time and scheduling specialist with 14+ years in shift-based industries and payroll platforms, who also builds the site's tools.

Are the tools and guides free?

Yes. Every guide and every tool on 24hourto12hour.com is free, runs in your browser, and needs no sign-up. Nothing you enter is stored.

How are the guides organized?

Into eight categories, from reading the clock and military time to payroll hours, time zones, developer timestamps, and productivity. Each category has its own hub page listing every guide in it.