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Guides — how to use clocks, alarms and time zones

Long reads about time: alarms, sleep, time zones, daylight saving and counting days.

673 guides in “Calendar”.

Calendar 4 min read

Happy friends day

Happy Friends Day is a greeting for Friendship Day, which does not sit on one worldwide date. The United Nations marks 30 July. Many places instead use the first Sunday in August.

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Calendar 4 min read

Happy friendship day

“Happy Friendship Day” is a greeting used to celebrate friends and the bonds between people. In the United States, National Friendship Day is commonly marked on the first Sunday in August; the United

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Calendar 4 min read

Happy national bf day

“Happy National BF Day” is a greeting for National Boyfriend Day on October 3. The label is unofficial. Banks, schools, and last collections ignore it.

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Calendar 4 min read

Happy women s day

“Happy Women’s Day” is an appropriate greeting for International Women’s Day on March 8. Make it warmer by naming the person’s contribution or expressing respect, while avoiding stereotypes about appe

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Calendar 4 min read

Hay day

Hay Day is not a statutory winter feast. It names a harvest stretch, a local summer gathering, or a farming game. None of those moves Christmas, which stays on 25 December.

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Calendar 4 min read

Hijri calendar

The Hijri calendar is the Islamic lunar year of twelve months. Months last 29 or 30 days. Religious dates such as Ramadan follow it, not the Gregorian year.

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Calendar 4 min read

Hiroshima and nagasaki bomb dates

The United States detonated an atomic bomb over Hiroshima on August 6, 1945, and another over Nagasaki on August 9, 1945. The two dates sit three days apart in August.

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Calendar 4 min read

History day website

A History Day website is a student contest entry built in National History Day’s own editor, or the program’s site at nhd.org. It is not a civic feast and does not close a school.

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Calendar 4 min read

Hobonichi weeks

Hobonichi Weeks is a slim weekly planner in the Japanese Hobonichi Techo line: the week on the left page, a graph memo page on the right, in a long-wallet size.

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Calendar 4 min read

Holly day

Holly day is holly used as Christmas greenery, and a pun on the word holiday. The plant is Ilex, with spiny leaves and, on female plants, red berries. It does not name a public feast.

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Calendar 4 min read

Holocaust day of remembrance

Holocaust remembrance commemorates the victims of Nazi persecution and encourages serious reflection on antisemitism, dehumanization, and the consequences of indifference. International Holocaust Reme

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Calendar 4 min read

Holy day december 8

8 December is the Catholic Solemnity of the Immaculate Conception. In the United States it is a holy day of obligation for Latin-rite Catholics, except when the feast itself falls on a Sunday and is t

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Calendar 4 min read

How far is a light year

A light-year is a distance: how far light travels in vacuum in one Julian year of 365.25 days. It is about 9.46 trillion kilometres, or about 5.88 trillion miles.

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Calendar 4 min read

How long is a light year

A light-year is not a length of time. It is the distance light travels through a vacuum in one year: about 9.46 trillion kilometers, or about 5.88 trillion miles.

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Calendar 4 min read

How many abortions in the us per year

There is no single official US count that every agency prints the same way. Recent national estimates of clinician-provided abortions have been above one million in a year.

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Calendar 4 min read

How many advil can you take in a day

On the Advil 200 mg label, adults and children 12 and over take 1 tablet every 4 to 6 hours, or 2 if needed, and do not exceed 6 tablets in 24 hours unless a doctor directs otherwise.

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Calendar 4 min read

How many bananas should you eat a day

There is no official banana quota for a day. One medium banana counts as fruit; how many you eat depends on the rest of your diet, your health, and whether a clinician has limited potassium.

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Calendar 4 min read

How many calories do i need a day

How many calories you need in a day depends on your body and that day’s movement. There is no one number for every person. A civil day is 24 hours; the need is yours, not the calendar’s.

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Calendar 4 min read

How many calories should i burn a day

You already burn calories all day through basic body functions and movement. There is no single daily target suitable for everyone; the useful amount depends on body size, age, activity, health, food

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Calendar 4 min read

How many calories should i eat in a day

How many calories you should eat in a day is personal. United States food labels use 2,000 calories as a general guide; your own need depends on age, sex, height, weight, and activity.

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Calendar 4 min read

How many calories should i have a day

How many calories you should have in a day depends on your body and that day’s work. United States labels use 2,000 calories as general advice; your need may be higher or lower.

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Calendar 4 min read

How many cat years is one human year

One human year is not a fixed number of cat years. Cats mature fast in the first two calendar years, then slower. After that, a common veterinary mapping treats each extra cat year as about four human

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Calendar 4 min read

How many centuries are in a year

A year holds no whole centuries. A century is 100 years, so one year is one hundredth of a century, written 0.01 centuries if you need a fraction.

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