Free Online Time & Date Tools
Turn timestamps and schedules into something a human can read
Time is one of the trickiest parts of a developer's day: timestamps come as seconds or milliseconds, servers run in UTC while users read local time, cron expressions cram five fields into a line that is easy to misread. These tools translate between those forms — converting timestamps to readable dates and back, and explaining cron expressions in plain English while previewing the next run times so you can confirm a schedule before shipping it.
All Time & Date Tools
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports seconds, milliseconds, ISO 8601, and every timezone. Free, no signup, runs entirely in your browser.
Timezone Converter
Convert any date and time between IANA time zones — UTC to EST, PST to Tokyo, Sydney to London. Correct DST handling, compare multiple zones side-by-side. 100% local.
Working Days
Count business (working) days between two dates. Customize your workweek (M-F, M-Sat, custom) and paste a list of holidays to exclude them. Also shows total days, weekend days, and calendar span. 100% local.
Age Calculator
Calculate your exact age in years, months, and days from a date of birth. Shows total weeks, days, hours, and minutes lived, plus the countdown to your next birthday. 100% local — nothing uploaded.
Date Diff
Calculate the exact duration between two dates in years, months, and days, plus total weeks / days / hours / minutes and business days. Optional time-of-day precision. 100% local.
Cron Generator
Build cron expressions from a friendly UI — every N minutes, daily at HH:MM, weekdays only, weekly, monthly, yearly. Preview the next 5 runs and a plain-English description. 100% local.
ISO 8601 Duration
Parse ISO 8601 duration strings (P3Y6M4DT12H30M5S, PT1H30M, P2W) into human-readable form, or convert total seconds into a canonical ISO 8601 duration. 100% local — used by REST APIs, video metadata, and scheduling systems.
Cron Parser
Parse and explain cron expressions in plain English. See the next 5 upcoming run times for any schedule.
When to use these tools
Use these tools when debugging a log with raw timestamps, verifying that a CronJob or scheduled task will fire when you expect, or converting between timezones and epoch representations.
Frequently Asked Questions
Are the results shown in my local timezone?
Yes. Timestamps and next-run previews are rendered against your browser's local timezone. Production servers usually schedule in UTC, so double-check when copying values to production.
Does the cron parser support the 6-field (Quartz) syntax?
The parser targets the 5-field Unix crontab syntax used by cron, Kubernetes CronJobs, and most cloud schedulers. The optional 6th 'seconds' field from Quartz is not supported.