Need the answer to “how long is it between 9:00 AM UTC and 12:30 PM UTC?” or “how many hours did I work between 9:27 AM and 4:42 PM?” The Pastetime Time Calculator handles those questions instantly. Instead of manual math or brittle spreadsheet formulas, paste any start and end time (in almost any format) and we’ll calculate the difference, display it in multiple formats, and give you one-click copy buttons.

Use it as a time difference calculator online, a time duration calculator, or a reliable way to double-check how much time sits between two timestamps.

🕒 Why Use a Time Calculator?

A dedicated time calculator removes guesswork and typos when you:

Track working hours or overtime across shifts.
Plan travel durations, event countdowns, or streaming schedules.
Compare timestamps across time zones or daylight saving changes.
Normalize log data into formats your tooling understands.

The Pastetime Time Calculator is built for people who work with time every day: developers, schedulers, project managers, support engineers, and curious time nerds.

⚙️ How the Pastetime Time Calculator Works

Enter your first timestamp
Paste 2025-11-11 09:15, 9:15am, or Tue, 11 Nov 2025 09:15:00 +1100. We auto-detect and parse the format.
Enter your second timestamp
Provide the end time, finish time, or comparison point—such as 2025-11-11 12:30 UTC, 5:19pm, or next Friday. The calculator focuses on the duration between two explicit timestamps (duration input is on our roadmap).
Review instant results
See the calculated duration plus ready-to-copy outputs: total days, hours, minutes, seconds, milliseconds, ISO 8601 duration, and a detailed breakdown.
Copy with one click
Each format includes a copy button so you can paste results into chats, spreadsheets, wiki pages, or code.

📝 Supported Input Formats

Built on the same parsing engine as our Time Converter, the calculator understands almost any format you throw at it.

Input type	Example
ISO 8601	`2025-11-11T09:15:00+11:00`
12-hour time	`9:15 AM`
24-hour time	`21:15`
Natural language	`Tomorrow at 7pm`
Unix timestamp	`1731291300`

No formatting gymnastics required—the tool recognises, normalises, and validates inputs automatically.

🧪 Real-World Examples

1. Verifying a Meeting Window

Planning an international video call that starts at 9:00 AM UTC and wraps at 12:30 PM UTC?

Enter 9:00 AM UTC as the first timestamp.
Enter 12:30 PM UTC as the second timestamp.
Get instant answers: a human-friendly duration (3 hours 30 minutes), plus totals in minutes, seconds, milliseconds, and the ISO 8601 duration PT3H30M.

2. Calculating Duration Between Two Times

Clocked in at 8:47 AM and clocked out at 5:19 PM?

Input both timestamps.
The calculator shows 8 hours 32 minutes, plus equivalents like 512 minutes, 30 720 seconds, and fractional days.

3. Measuring a Short Gap

Trying to confirm the gap between 2:30 PM and 4:00 PM?

Enter 2:30 PM as the first timestamp.
Enter 4:00 PM as the second timestamp.
See the difference (1 hour 30 minutes) alongside the ISO 8601 duration PT1H30M and totals in minutes and seconds.

🧭 Why the Pastetime Tool Is Different

Understands everyday language: No strict format rules or manual conversions.
Handles time zones and DST: We account for offsets and daylight saving changes automatically.
Displays multiple results at once: Jump between ISO 8601 duration, total hours, total seconds, and a detailed breakdown without extra steps.
Free, privacy-friendly, and login-free: Use it as often as you like without creating an account.

Pair it with our Time Zone Converter for global scheduling or the Business Days Calculator when you need working-day precision.

✅ Quick Start Checklist

Paste any first timestamp—no formatting rules.
Enter the comparison timestamp (earlier or later).
Copy the duration in the format you need.
Link to the tool in your workflow docs so teammates can access it fast.

👉 Use the Time Calculator now to compare timestamps and calculate durations instantly.

❓ Frequently Asked Questions

Can I subtract time (use negative durations)?
Enter the earlier timestamp first and the later timestamp second—the calculator reports a negative value automatically when the second time is earlier.

Does it handle daylight saving changes automatically?
Absolutely. We detect your local timezone and apply the correct DST rules when displaying results.

Can I copy results into code or spreadsheets?
Every result has a one-click copy button, so you can paste ISO 8601 duration strings, total seconds, or human-readable formats wherever you need them.

🔗 Related Tools & Resources

⚡ Time Calculator
🌍 Time Zone Converter
📖 How to Convert UTC to Your Local Time
🧭 Understanding Timestamps: ISO, Unix, and RFC Formats

Need more time tools? Explore the full suite at Pastetime.com.