Questions tagged [date]
This challenge is intended to be solved by using, manipulating, accepting as input, outputting, or calculating calendar dates or clock times.
280
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Has my milk expired?
Aww, man, this expiry date doesn't write the months with letters! I can't tell if it's expiring on March 10th or October 3rd... Wait, no, never mind, the year says 2012. (alley-oops half-used brick of ...
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votes
54
answers
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Sleep for 1000 years
Some sleep commands implement a delay of an integer number of seconds. However, 2³² seconds is only about 100 years. Bug! What if you need a larger delay?
Make a ...
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Wait a minute – in less than ten seconds
Task
Using any type of parallelisation, wait multiple periods, for a total sleep time of at least a minute (but less than a minute and a half).
The program/function must terminate within 10 seconds ...
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Legen… wait for it…
dary!
In events entirely unrelated to what will hopefully happen to me in the next couple of days, I task you to write code that does the following:
Print
...
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Automate Saving the World
You are Desmond Hume. For the last 3 years, you and your partner, Kelvin, have been slave to a computer that requires a very specific sequence to be entered into it every 108 minutes to save the world....
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Increment The Time
Every digital clock contains a small creature that has to advance the time every minute [citation needed]. Due to the popularty of digital clocks and the popularity of catching them in the wild, they ...
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Convert YYYYMM to MMMYY
Basing on this SO question.
Challenge is rather simple: given a date period in the format YYYYMM output it in the format MMMYY.
...
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Print a word clock
Since I saw the first one a few years ago, I always was subjugated by this kind of word clock where the time is actually spelled out by words being lit up or not into a meaningful sentence.
The text ...
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Who was president of the USA?
Challenge
Write a program that takes as input a day from April 30, 1789 to August 21, 2019 and returns as output who was president of the USA that day.
Notes
For the list of US presidents, the ...
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votes
35
answers
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Encode the date in Christmas Eve format
The day this post was published was Christmas Eve. Tomorrow will be Christmas. Yesterday was Christmas Eve Eve. In two days it will be
...
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answers
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ASCII Art Calendar
Let's make an ASCII art clock and calendar that tells us the current month, day of the month, day of the week, hour, minute, and whether it's night or day (but not the year or second).
At any ...
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I'm too cold, turn up the temperature
This is my first golf contest.
What you need to do
Build me, in the shortest amount of bytes possible, my AC remote control system. My room is too cold right now, and I'm missing my remote.
Now, I ...
user59331
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votes
19
answers
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Detect Time Travel
Computers are everywhere nowadays - in cars, trains, skateboards, even nuclear reactors. The possibility that your software will run in a time travelling device is just a matter of time. Can you deal ...
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We had a question once which only failed on Sundays
Inspired by We had a unit test once which only failed on Sundays, write a program or function that does nothing but throw an error when it is Sunday, and exit gracefully on any other day.
Rules:
No ...
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Type the Alphabet - as fast as you can!
Your task is to make a program that measures how fast you can type the letters of the English alphabet.
The program shall only accept lowercase letters a to ...
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List of possible birth years of living humans
The Challenge
Output a list of years that starts with the current year and ends 120 years ago. The birth year of every living human would be included in this list.
Details
The list should be in ...
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Read a date in xkcd notation
In his xkcd about the ISO 8601 standard date format Randall snuck in a rather curious alternative notation:
The large numbers are all the digits that appear in the current date in their usual order, ...
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Is it a leap year?
This challenge is quite simple. You will take an input which will be a year from 1801 to 2400, and output if it is a leap year or not.
Your input will have no newlines or trailing spaces:
...
user40734
46
votes
28
answers
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Big Ben goes BONG
Your task is to create a program that is to mimic Big Ben (Twitter).
Task
Whenever a new hour has begun (according to your computer's local time or UTC), you have to output ...
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45
votes
94
answers
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Output the Current Time
Challenge
You must output the current time continuously (until cancelled by an interrupt), once every second, by any of the following means:
It must be in 24-hour or AM/PM format.
If it is the ...
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42
votes
16
answers
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Use xkcd's formula to approximate the world population
In xkcd 1047, Randall Munroe lists "slightly wrong" approximations of assorted quantities and numbers with varying precision and complexity, such as that the number of liters in a gallon is very close ...
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Happy Birthday, Finland!
Introduction
As is known, in 2017, Finland celebrates its 100 years of independence. To mark the occasion, it is your job to produce a Finnish flag for everyone's enjoyment.
Challenge
Create a ...
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When is Thanksgiving?
Background
Some holidays have fixed, easy-to-remember dates, like Oct 31, Dec 25, etc. Some, however, want to be troublesome. They're specified as things like "the first Monday in September" or "the ...
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Advance Happy New Year, 2016!
Your input will be a integer between 1970 and 2090 (inclusive), representing a year. Your program should output the next year on which New Years Day falls on the same day of the week as the input year....
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votes
29
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Stop, stand there where you are!
Challenge
Write a function which takes one parameter: an integer t. Your function has to stop your program for t seconds before ...
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37
votes
6
answers
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COBOL Y2K redux
In the 1990s, COBOL computer engineers worked out a way to extend six-digit date fields by converting them to YYYDDD where YYY ...
user15259
36
votes
14
answers
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Today is the Center
Given a date as input in any convenient format, output a calendar with that date as the exact center of a five-week window. The header of the calendar must include the two-letter abbreviations for the ...
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It's [current year] already, folks, go home
On most new-years challenges when it is currently not the corresponding year of the challenge, It says this in the front.
It's [current year] already, folks, go home.
You have to output this text ...
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Is it Christmas?
Challenge
Given that Christmas is:
December
Month 12
Day 25
Every year, determine today's date, and whether or not today is Christmas.
If it is Christmas, you must print ...
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Merry Golfmas, Everyone!
It's Christmas everybody, and here's a code-golf challenge to celebrate. You need to make a program to print out a present. Specifically, the words "Merry Christmas". BUT, there is a catch: this ...
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What day is it (on Flooptonia)?
You are a space tourist on your way to planet Flooptonia! The flight is going to take another 47,315 years, so to pass the time before you're cryogenically frozen you decide to write a program to help ...
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Is it really time?
A time in the format hhMMss is represented by six numbers in the range 0..9 (e.g.100203 for 3 seconds after 2 minutes after 10am (10:02.03), or ...
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How many countries are in the European Union?
Tonight, 31 January 2020, Brexit will happen and the United Kingdom will leave the European Union, the first time that the number of EU member states will decrease.
Your job is to take a date and ...
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The symmetry of months
Introduction
Some months are completely symmetric, meaning they have central symmetry as well as reflection symmetry, like February of 2010:
...
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35
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Help, I've mixed my week up!
My dog ate my calendar, and now my days are all mixed up. I tried putting it back together, but I keep mixing up the days of the week! I need some help putting my calendar back together, with the days ...
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How much time is remaining?
The Program
You are given two strings, A and B. A is the current position at which your timer is at, and B is the position at which your timer will stop. Both strings are in the format m:ss. You must ...
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Setting the time
Imagine the following 24-hour clock that can be controlled by arrow keys:
╔══╗ ┌──┐
║00║:│00│
╚══╝ └──┘
HH mm
Pressing the up arrow twice (...
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When will Brexit happen?
Well, Brexit happened. And Sky News, being the geniuses they are, have decided to create a countdown on the side of a bus.
Your job is to do something similar. The UK leaves the the EU on 31st of ...
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votes
22
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The Time Anagram
Originally posted (and deleted) by @Tlink, which was most likely inspired from this StackOverflow question.
Since it was a shame it got deleted, because it seemed like a good challenge in general, I ...
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crossed out 44 is still regular 44 ;(
Introduction
On March 24th, 2015 @isaacg golfed his Pyth answer from 44 to 42 bytes. Since a crossed out 44 (44) looks a lot like a regular 44, @Optimizer made the following comment:
striked out ...
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Compute the RFC 2550 timestamp
RFC 2550 is a satirical proposal (published on April 1, 1999) for a space-efficient ASCII representation of timestamps that can support any date (even those prior to the beginning of the universe and ...
user45941
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36
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Days in indexed month
This simple challenge is very similar to this one: How many days in a month? The only difference is you yield the number of days in a month given the index of the month instead of its name.
The ...
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The Last Monday
Monday, October 31st, is Halloween. And it got me thinking -- I wonder what other months have the last day of the month also be a Monday?
Input
A positive integer in any convenient format ...
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votes
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What's the Date?
Challenge
Weirdly, this hasn't been done yet: output the current date.
Rules
The date format you should follow is as follows:
YYYY-MM-DD
Where the month and ...
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37
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How many friday the 13th in a year?
Your challenge is to write a program which, given a year, outputs the number of "Friday 13ths" in it.
Rules & Details:
You can take input via STDIN, or as an ...
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How old is it roughly?
Write a short program which takes in a positive number of seconds representing an age, and outputs an estimate of that time in English.
Your program must output the least precise amount of time which ...
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Leap for Leap Seconds!
Since today marks the occasion of the 26th leap second ever to occur, your challenge will be to output the date and time of every leap second in GMT or UTC that has occurred so far, as well as the one ...
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12 hour to 24 hour time converter
Amazingly, this simple task doesn't seem to exist already, so...
Your task is to write a program that takes as input a 12 hour time, and converts it into "military time", or 24-hour time format.
...
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Format microseconds as hours:minutes:seconds, etc
The following is inspired by a question that came up on Stack Overflow today.
Given a number of microseconds, 0 <= n <= 86400000000 (e.g. ...
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Alarm Optimization
My Alarm Clock
I'm American, and so is my (digital) alarm clock. To set the alarm, it starts at the time it was previously. Hitting the hour button moves it up one hour, and hitting the minute button ...
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