How to Set an Alarm on Any Device
Set a reliable alarm on an iPhone, Android phone, Windows or Mac computer, smart speaker, or web browser, with practical checks that prevent missed alerts.
By Online Alarm Clock
Guides — how to use clocks, alarms and time zones
Long reads about time: alarms, sleep, time zones, daylight saving and counting days.
This is the index of every guide on this site: short, practical instructions for our clocks, timers, countdowns, and the word counter. Pick the tool you need below, and its guide will walk you through it in a few minutes.
1637 guides.
Sleep Cycles and the Best Time to Wake Up
Use sleep-cycle timing as a practical estimate for bedtime and wake-up planning while keeping total sleep, consistency, and individual variation in view.
By Online Alarm Clock
Time Zones Explained: UTC Offsets, GMT, and Local Time
A clear guide to time zones, UTC offsets, half-hour and quarter-hour zones, GMT, daylight saving time, and accurate conversion between places.
By Online Alarm Clock
Daylight Saving Time: How Clock Changes Work
Understand why daylight saving time exists, when clocks change in the United States and Europe, where it is not used, and how reliable time tools handle changing rules.
By Online Alarm Clock
How to Use a Pomodoro Timer for Focused Work
Learn the practical Pomodoro method, choose useful work and break lengths, fit sessions into a real day, and handle interruptions without losing the task.
By Online Alarm Clock
How to Count Days Between Two Dates
Calculate calendar days, inclusive days, working days, weeks, and month-based spans correctly, including leap years and reversed date ranges.
By Online Alarm Clock
1 sep holiday
1 September is a public holiday only where a country named it one. The United States has no federal holiday on that date. Uzbekistan keeps Independence Day. Labor Day in 2026 was 7 September, not the
By Online Alarm Clock
10 year anniversary
A 10 year anniversary is the same month and day ten civil years after the original date. If that day does not exist in the later year, pick 28 February or 1 March and say which.
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100 seconds
100 seconds equals one minute forty seconds, or 100 s, or PT1M40S. It is a short duration. It is not 1:00, and it is not a hundred on a digital clock.
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10000 days
10,000 days is a little more than 27 years: 27 × 365 = 9,855 days, so 145 days remain if you ignore leap days.
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107 days
107 days is a span of 107 midnights on the civil calendar: 15 weeks and 2 days. From Thursday 3 September 2026 that span ends on Saturday 19 December 2026.
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11th november holiday
The 11th November holiday is Armistice Day, Remembrance Day, or Veterans Day, depending on the country. It is a fixed date, 11 November, not a floating Monday. Other November holidays sit on other day
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12 dates of christmas
12 Dates of Christmas is a 2011 ABC Family television film in which a woman relives Christmas Eve until she treats people better. It is a time-loop rom-com, not a dating app.
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120 minutes in hour
120 minutes is 2 hours, because one hour holds 60 minutes. Write it as 2:00 or as two hours; it is not 120 hours.
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13 hour cast
A 13 hour cast writes thirteen hours as a label in front of the word cast. Most people who type it want the actors in the film 13 Hours. The number is a duration, not a clock time.
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14 days with you
Fourteen days is two weeks. Every month has at least 28 days, so the riddle “how many months have 28 days” is twelve, not one.
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14 hour ago
Fourteen hours ago is the instant 14 hours before now. An hour ago calculator subtracts that span from the current clock, in the same time zone, and shows the earlier timestamp.
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150 min to hour
150 minutes equals 2 hours and 30 minutes, or 2.5 hours in decimal form. Divide minutes by 60 for decimal hours; for an hours-and-minutes format, use the quotient as hours and the remainder as minutes
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16 weeks pregnant
Sixteen weeks pregnant means a gestational age of 16 weeks. Clinics usually count those weeks from the first day of the last menstrual period, or from dating a clinician assigned.
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1ms to seconds
One millisecond equals 0.001 seconds. To convert milliseconds to seconds, divide the millisecond value by 1,000.
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1st day of spring
The 1st day of spring depends on the definition and location. Meteorological spring uses a seasonal calendar, while astronomical spring begins at an equinox. In the Southern Hemisphere, spring occurs
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1year how many seconds
A common year holds 31,536,000 seconds and a leap year holds 31,622,400. Both products start from how many seconds on a day: 86,400.
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1year how many weeks
One year has 52 weeks plus 1 day in a common year, and 52 weeks plus 2 days in a leap year. That is 365 or 366 days, not a round 52.
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2 3 years dagestan
Two to three years is a span of 24 to 36 months, about 104 to 156 weeks, plus leftover days. The phrase is a duration, not a weekend, and not a single season.
By Online Alarm Clock
How to use All guides
Scan the list and open the page that matches your task. Every guide follows the same shape: what the tool does, how to start it, what the controls mean, and a short FAQ built from questions readers actually send. None of the tools require an account or an installation — each one runs in an ordinary browser tab, and its guide points out the two or three things worth knowing before you press the first button.
Guides for the word counter and other writing tools
The most visited guide here explains the online word counter: paste a draft, read the totals, and see whether your essay, ad, or post fits its limit. If you write to a length requirement — school assignments, application letters, meta descriptions — start there. The guide also covers the habits that make counting useful, like checking the total before you trim rather than after, so you know exactly how much has to go instead of cutting blind.
Guides for clocks, timers, and countdowns
Most of the collection deals with time. There are guides for the stopwatch, the tally counter, the holiday countdown pages, and two longer reads that explain how time zones and daylight saving actually work. The explainers pair well with the live tools: read the theory once, then lean on the map and the converter whenever a meeting crosses an ocean. If you only ever open one, make it the daylight saving guide the week before the clocks change.
Stopwatch and timer basics — measuring up versus counting down Countdowns to Halloween, New Year, and other dates people wait for Time zones explained, and what daylight saving does to them Small tools: tally counter, coin flip, password generator, widgets
How the guides are written
Long manuals get skimmed; short ones get read. So each guide answers the main question in its first paragraph and keeps the details for people who scroll. If a page leaves your question unanswered, that is a defect by our own definition — the FAQ sections grow out of exactly those gaps, one reader at a time. A good guide is like a good referee: when it does its job, nobody remembers it was there.
Questions and answers
- Are the tools behind these guides free?
- Yes, all of them — including the free word counter, the stopwatch, and every countdown page. There is no premium tier hiding behind a button, and no sign-up gate in front of anything.
- Do I have to read a guide before using a tool?
- No. The tools are meant to be self-explanatory. The guides exist for the edge cases: the option you did not notice, the question that comes up halfway through the job.
- Where do new guides appear?
- On this page. When a tool or a longer explainer is added, its guide is listed here, so this index is always the complete picture of what the site can teach you.