Olutil stands for Online Utilities — a growing suite of privacy-first, browser-native web tools. This sub-site brings you a complete suite of time utilities that run entirely in your browser: Unix timestamp converters, date difference calculators, timezone converters, world clocks, countdown timers and more, all in one place. 100% Local Processing
Convert Unix timestamps to human-readable dates. Supports seconds, milliseconds, microseconds and nanoseconds. Free online conv...
Convert Unix epoch time to human-readable dates and back. Shows seconds, milliseconds, ISO 8601, RFC 2822 and comparison with f...
Convert a date or datetime string into Unix seconds, milliseconds, microseconds or nanoseconds. Runs in your browser, nothing i...
Live current Unix timestamp with millisecond precision. Updates automatically and shows ISO 8601, RFC 2822 and local time. Free...
Convert Unix timestamps to ISO 8601, RFC 3339 and RFC 2822 strings. Pick any IANA timezone for the offset. Free online converte...
Convert ISO 8601, RFC 3339 and RFC 2822 strings to Unix seconds, milliseconds, microseconds and nanoseconds. Instant, in-browse...
Convert any Unix timestamp to UTC, your local time and any IANA timezone at once, with the exact offset difference in hours. Fr...
Generate the current or any specified time as Unix seconds, milliseconds, microseconds and nanoseconds. Exact integers, plus IS...
Calculate the exact difference between two dates in days, weeks, months and years. Shows the calendar difference and total hour...
Difference between two dates with inclusive day counts, working days, non-working days, excluded public holidays and total week...
Count working days between two dates. Customisable rest days, public holiday exclusions, calendar days and weekly workdays. Fre...
Add or subtract days, weeks, months, years, hours, minutes and seconds from any date. Shows the result in ISO 8601, RFC 2822 an...
Find the weekday of any date, with ISO weekday number, day of year, ISO week and the first weekday of the month. Free online da...
Find the ISO 8601 week number, ISO week date, US week number, day of year, quarter and leap year status of any date. Free onlin...
Check if any year is a leap year under the Gregorian rules, with the century exception explained. Shows day counts and nearby l...
Calculate exact age in years, months and days from a birth date, with total months, weeks, days and hours, plus your next birth...
Live countdown to your next birthday. Shows days remaining, the date, your current age and today clock, updating every second. ...
List every date between two dates with a custom step: daily, weekly, monthly or yearly. Shows count and calendar span. Free onl...
Generate random dates between two bounds in five formats: YYYY-MM-DD, US or European order, ISO with time, or Unix seconds. Fre...
Convert the current time or any specific time between two timezones. 50 world cities, exact offset difference, DST handled auto...
Convert UTC or GMT time to your local time. Shows the local date, whether the day shifts across midnight, your offset and Unix ...
Live world clock showing the current time in 50 cities with dates, weekdays and UTC offsets. Updates every second, searchable, ...
Calculate the exact time difference between two timezones on any date. Shows both offsets, the gap in hours, weekdays and wheth...
Pick a meeting time in any timezone and see the matching wall clock time in every selected city. Perfect for cross-timezone tea...
Calculate the UTC offset of any timezone on any date, in hours and minutes, plus the standard and DST offsets of the zone. Free...
Check whether daylight saving time is active in any timezone on any date. Shows the offset, the standard offset and when DST ap...
Online stopwatch with 10 millisecond precision and split lap recording. Start, pause, resume and reset without losing your plac...
Free online countdown timer with hours, minutes and seconds, quick presets and a live progress bar. Alerts you when time is up....
Pomodoro timer with work sessions, short and long breaks, and automatic cycling. Customise minutes and session count. Free focu...
Live countdown to any date or event. Shows days, hours, minutes and seconds remaining, updating every 250 milliseconds. Counts ...
Compact analog world clock for 50 cities in a dense grid. Pin any city to a top row that stays visible, with live hands, dates ...
Format any date with your own pattern. Tokens for year, month, day, week, day of year, weekday and offset. Presets included, ru...
Convert seconds to HH:MM:SS with days and hours broken out for long durations. Handles fractions and totals. Free online second...
Convert a HH:MM:SS or H:MM:SS duration string to total seconds, minutes and hours. Handles hours above 24. Free online time con...
Convert time between seconds, minutes, hours, days, weeks, months and years. Shows every unit in one conversion. Free online ti...
Parse ISO 8601 durations like P1Y2M3DT4H5M6S into total seconds, minutes, hours and days, or build an ISO duration from a plain...
Convert between Excel serial numbers and real dates. Handles the 1900 leap year bug, the 1904 Mac system, and time fractions in...
Convert between Julian Date, Modified Julian Date and normal calendar dates. Astronomical continuous day count, accurate to the...
Convert Unix time to GPS time, GPS week number, NTP 64 bit timestamp and TAI. Includes the 37 second leap offset and NTP hex fr...
Format HTTP date headers like Sun, 06 Nov 1994 08:49:37 GMT. Convert between HTTP dates, ISO 8601, Unix timestamps and local ti...
Calculate cookie expiration from a session length or an exact date. Get the Expires header, Max-Age seconds and a ready Set-Coo...
Convert between the Gregorian and Hijri Islamic calendars using the Umm al-Qura system. Both directions, with weekday and month...
Convert any Gregorian date to the Hebrew calendar with weekday, month and Hebrew year. Uses the browser calendar engine, runs l...
Calculate the moon phase for any date: new moon, full moon, quarters and crescents, with age, illumination and next moon events...
Estimate sunrise and sunset times for any city and date using latitude and longitude. Includes daylight length. Free online sun...
Convert dates to and from Roman numerals, e.g. 20.IX.MMXXVI. Supports both directions and any year 1-3999. Free online date con...
Live Swatch Internet Time in beats, with UTC and your local time. @000.000 format updates in real time. Free online .beat clock.
Live binary clock: hours, minutes and seconds rendered as glowing LED columns. Read the time visually or hit decode. Free onlin...
Live decimal time where a day is 100,000 units, plus a converter between decimal time and normal HH:MM:SS. Free online decimal ...
Calculate net work hours between a start and end time, minus breaks, and multiply for any number of work days. Free online hour...
Enter daily start, end and break times to total your weekly work hours. Optional hourly rate shows gross pay. Free online time ...
Every tool on this site runs as a self-contained page in your browser. There is no backend server, no account and no upload: you type or paste a value, the page computes the result on your own device and displays it instantly.
Pick a tool from the grid below, make your selection or paste your data, and press the convert or calculate button. The result appears immediately with the values you need, ready to copy.
Yes. Every tool on time.olutil.com is free to use, runs entirely in your browser and needs no account or sign-up of any kind.
No. All processing happens locally in your browser. Your dates, timestamps and timezones are never sent to any server.
A Unix timestamp counts the seconds since 1 January 1970 00:00:00 UTC. This tool converts between those numbers and normal dates.
Yes. Offsets are computed from your browser built-in timezone database, so daylight saving transitions are handled automatically.
Absolutely. The whole site is responsive and works on any screen, and because every tool is self-contained you can keep it open as a reference.