Time Planning

Time Calculator

Calculate time duration, add minutes to a start time, and measure business days for cross-timezone projects.

Time Duration Calculator

Subtract break minutes to log net working time.

Net Time
Presets:
Net duration
8h
Worked: 8h (94%)Break: 30m
Start 09:00Total Span: 8h 30mEnd 17:30

Add Minutes to Time

Shift meeting times or reminders instantly.

Shift Time
Quick Shifts:

New time

16:40

Added 145 minutes

Time Between Dates (Business Days)

Exclude weekends and holidays.

Calendar
Ranges:
Business day count
11 / 15 total days
🗓️
Business11d
Weekend4d
Holidays0d

Quick FAQs

Common tips for the time duration calculator and business-day schedules.

  • How do I log overnight shifts?

    Enter end time earlier than start—the calculator rolls to the next day automatically.

  • How do I add minutes across midnight?

    Use add-minutes mode; it returns the correct next-day time.

  • Can I exclude public holidays?

    List holidays in the field to remove them from the business-day count.

How to calculate time differences

Use the tabs to add, subtract, or compare timestamps across time zones.

  1. Pick a mode

    Choose Add Time, Subtract Time, Time Between, or Countdown.

  2. Enter times

    Fill in start and end timestamps or the durations you want to add.

  3. Set time zone

    Select UTC or a city to convert results across locations.

  4. Review the output

    Check total duration, result timestamp, and any day rollover notice.

Case study: Global release planning

An operations team coordinates a product launch that spans regions.

Start time
2026-06-15 18:00 UTC
Tasks
Staging 9h, QA 3h, Buffer 2h
  1. Add durations

    Using Add Time, the team enters each task duration to find a 14-hour total.

  2. Convert zones

    Switching to Pacific Time shows a 01:00 local deployment window.

  3. Countdown

    Countdown mode tracks the remaining hours as the launch approaches.

Operations takeaway

Stakeholders receive a single schedule with UTC and local timestamps to avoid confusion.

Time calculator FAQs

Can I copy times from spreadsheets?

Yes. Paste values and the calculator normalizes them automatically.

Does it handle negative results?

Subtract mode shows negative durations when the end time precedes the start time.

Can I save multiple scenarios?

Use the history list to revisit recent calculations or copy the summary into your tracker.

Further reading

  • Coordinated Universal Time basics
  • Project scheduling best practices
  • IANA time zone database

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