Free time planning tools
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Convert time zones, timestamps, seconds, hours, and HH:MM:SS values, calculate durations, create countdowns, count business days, and plan dates.
Best for meetings, logs, deadlines, launch countdowns, sprint labels, ISO week planning, seconds-to-hours conversion, HH:MM:SS cleanup, start-to-end duration checks, date-time offsets, editing timelines, learning plans, date math, and day-to-day time planning.
Category
Time tools
Access
Free
Data handling note
Time tools calculate dates, durations, timestamps, and zones in the browser. Double-check local time, daylight-saving changes, excluded days, and log units before sharing results.
Last updated
June 30, 2026
Best for meetings, logs, deadlines, launch countdowns, sprint labels, ISO week planning, seconds-to-hours conversion, HH:MM:SS cleanup, start-to-end duration checks, date-time offsets, editing timelines, learning plans, date math, and day-to-day time planning.
Open an individual tool page when you need the actual controls, examples, assumptions, FAQs, and related links.
I have start and end times: Use Time Duration Calculator.
I have a timestamp from logs: Use Timestamp Converter and confirm seconds versus milliseconds.
Compare start and end times: Time Duration Calculator
Convert Unix or ISO timestamps: Timestamp Converter
Featured tools
Best starting points in Time tools
These tools are surfaced from the category decision guide, so they match the most common tasks before the full list below.
Use this when you know start and end values and need elapsed hours, minutes, days, or overnight handling.
Next: Use add/subtract time when you already know the duration to apply.
Processing: Browser-side date and time math.
Use this when logs, APIs, databases, or analytics exports mix Unix seconds, milliseconds, ISO, UTC, and local time.
Next: Confirm seconds versus milliseconds before documenting a timestamp.
Processing: Browser-side timestamp parsing.
Use this for meetings, handoffs, or launch windows across regions.
Next: Check daylight-saving assumptions near date boundaries.
Processing: Browser-side time-zone comparison.
Use business days when weekends or excluded dates matter; use date add for calendar offsets.
Next: Document excluded holidays manually when they affect the result.
Processing: Browser-side calendar math.
Use these for watch-time, course planning, or total runtime estimates.
Next: Use video duration totals before planning compression or publishing workflows.
Processing: Browser-side duration math.
- Mixing Unix seconds and milliseconds.
- Ignoring overnight ranges, daylight-saving changes, or local time zones.
- Counting calendar days when a deadline actually depends on business days.
- Using playback-speed estimates without including breaks or review time.
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All Time tools
This page groups related tools for easier browsing, while every individual tool page focuses on the specific workflow and output.
Can these tools help with global meetings?
Yes. The time zone converter compares IANA time zones and common global regions for meeting planning.
Can I convert Unix timestamps?
Yes. The timestamp converter handles Unix seconds, Unix milliseconds, ISO dates, UTC, and local time formats.
Can I convert seconds, hours, and HH:MM:SS values?
Yes. The time unit converter handles seconds to hours, hours to seconds, minutes to hours, HH:MM:SS to seconds, and seconds to HH:MM:SS.
Can I calculate time between two times or add time to a start?
Yes. The time duration calculator handles start and end date-time ranges, while the add/subtract time calculator moves one date-time forward or backward by hours, days, weeks, or months.
Can I calculate video or podcast time savings?
Yes. The playback speed calculator estimates adjusted completion time at different speeds.
Can I count working days between dates?
Yes. The business days calculator counts weekdays, weekends, calendar days, and manually excluded holiday dates.
Can I calculate ISO week numbers?
Yes. The week number calculator returns ISO week number, ISO week-year, day of year, quarter, and simple Sunday or Monday-start week numbers.
Can I create a deadline countdown?
Yes. The countdown calculator shows days, hours, minutes, and seconds remaining until a local target date and time.
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