Questions tagged [date]
This challenge is intended to be solved by using, manipulating, accepting as input, outputting, or calculating calendar dates or clock times.
265
questions
14
votes
10answers
899 views
Which Advent is it?
I know, a bit late.
Challenge
Your challenge is, given a date, output if it's not an Advent Sunday, or the Advent Sunday of the year.
Rules
The \$4^\text{th}\$ Advent is determined by the Sunday ...
57
votes
47answers
8k views
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 ...
16
votes
14answers
2k views
When's the Listening Party?
A listening party is an event where a bunch of people get together to listen to some music (like a viewing party, but for music). In the age of the internet you can do Listening Parties online with ...
11
votes
7answers
752 views
Days of the Week
Create a function that accepts a list of dates (unsorted with possible duplicates) and returns the days of the week in one of the following formats:
A format similar to ...
1
vote
0answers
61 views
Calculate the ISO week of Gregorian Easter [duplicate]
As in this question, your task – should you choose to accept it – is to calculate the date of Easter Sunday according to the Gregorian Computus (as used in the Catholic Church and most others) when ...
18
votes
31answers
3k views
Get the day of the year of a given date
Challenge
Given two positive integers \$1 \le m \le 12\$ and \$1\le d \le 31\$, representing a month and days into the month, output the amount of days that have passed since January 1st, on a non-...
14
votes
6answers
501 views
When's my weekend finally here?
I like my job, but sometimes it can get a bit tedious and boring. As motivation, I want to know how many hours of work are left before I finally get my two days of weekend and relaxation.
I work ...
6
votes
5answers
258 views
US Tax Due Dates
Introduction
In a standard* (e.g. not 2020) tax year, estimated payments are due quarterly according to the schedule outlined in Publication 505.
Payment Period
Due Date
January 1 – March 31
April ...
8
votes
5answers
451 views
When will DST start / end
Daylight saving time (DST), is the practice of advancing clocks (typically by one hour) during warmer months so that darkness falls at a later clock time. The typical implementation of DST is to set ...
11
votes
8answers
2k views
Generate a British numberplate
Modern British number plates (a.k.a. registration marks or license plates) use the format AANNXXX where AA is a "DVLA ...
24
votes
24answers
2k views
Help me get the day of the week correct
Sometimes, I will think it is one day of the week (e.g Friday) when in reality, it's earlier in the week (e.g Tuesday).
Your challenge is to display the number of days my estimates are off by.
...
19
votes
3answers
2k views
Calculate longest Stack Exchange streak
Introduction
This challenge is inspired by the Meta Stack Exchange question The longest consecutive days streak; it turns out that the URL ...
7
votes
25answers
523 views
Which th second now in this year
In this challenge you have to find out which nth second it is now in this year, current date and time now. Or in other words, how many seconds have passed since New Year.
An example current Date is (...
23
votes
37answers
5k views
What year will it be in n seconds?
You are given an integer n as input, and, regardless of the current date, must return the calendar year (Gregorian calendar, other calendars not allowed) taking ...
25
votes
15answers
4k views
How long till Halley's Comet returns?
Halley's Comet is the only comet that may appear (i.e. become visible to the naked eye on Earth) twice in a human lifetime. The orbital period of Halley's Comet is not constant: it has varied between ...
7
votes
12answers
1k views
Output ISO8601 date string from seconds and nanoseconds
One reason why ISO8601 is the best date string format, is that you can simply append as much precision as you like. Given 2 integers representing seconds and nanoseconds that have passed since ...
15
votes
10answers
2k views
When does hh:mm = mm.ss?
Let's begin with a thought experiment. You have a clock and a timer, in which you start the timer when the clock shows exactly hh:mm.00.
Clock: The clock employs ...
-1
votes
8answers
2k views
Make a Ramanujan magic square
Background
As you maybe know Ramanujan made this magic square by \$4x4\$ Matrix:
This works like all magic squares.
But the special thing in this square is that his birthdate is hidden in the first ...
15
votes
4answers
923 views
Eight days a week
Back in 1965, The Beatles released their hit song 'Eight Days a Week'.
In this code-golf challenge we are going to reimagine dates of the 21st century as if there really were eight days a week.
Input
...
8
votes
4answers
509 views
Find the date that is n days from January 1st 1984
This challenge is a relatively simple concept that I'm surprised has not been done yet. You will be given only an integer as an input. Your task is to find the date that is this number of days from ...
20
votes
35answers
3k views
Does this month start on a Monday?
June 2020 is a month in which June 1st corresponds to Monday, June 2nd corresponds to Tuesday, ... June 7th corresponds to Sunday. For reference, here's the cal of ...
6
votes
3answers
251 views
Can I trade today?
Back in 2018, there has been introduced new law in Poland to ban trading on sundays,
but certain exceptions have been made (listed below). The task today is to determine,
can one trade on the sunday ...
31
votes
35answers
5k views
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 ...
18
votes
7answers
2k views
When is the closest Conway's Doomsday?
A quote from MO.SE answer:
Although it is well known that Conway was able to quickly calculate the day of the week of any given date, it is less well known that one part of the algorithm is easy to ...
24
votes
13answers
5k views
Is this a legal date? - April Fools' edition
Task
A date can be compactly represented in a 6-character string in the format ddmmyy where the first two characters (dd) ...
22
votes
19answers
4k views
Even a clock that isn't working gets the time right two or three times a day
Context
When I was a little kid, I watched a Disney movie where Goofy told his son "Boy, even a broken clock is right two or three times a day." (see this youtube clip, courtesy of @Arnauld).
...
17
votes
12answers
1k views
Day of the week of an ambiguous date
Goal
Write a program or function that returns the day of the week for a date, eg.
01/06/2020 -> Mon
However, it's unknown if the date is in the format mm/...
9
votes
6answers
570 views
Pairs of palindromic anagramic dates separated by a palindromic number of days
Definitions:
A palindrome is a string which reads the same backward or forward (not counting spaces or special characters), such as "madam" or "Sorel Eros".
A date is said to be a palindrome when ...
32
votes
43answers
7k views
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 ...
33
votes
12answers
3k views
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 ...
7
votes
14answers
2k views
Print out execution time of program [closed]
Challenge
Write a complete program that prints out the time it took to execute a certain part of itself. That part must include a process whose total number of operations (and therefore execution ...
12
votes
17answers
3k views
How many ACUs do I have?
Posted from sandbox
The Intro
What is an ACU? This challenge is based on the concept of money and since this is an international community, we all use different currencies, so in keeping with our ...
16
votes
6answers
3k views
What's the Mayan date?
Just over seven years ago, everybody suddenly stopped talking about the Maya people. It is time to rectify that!
For clarification, I am talking about the Mesoamerican Long Count Calendar. Your ...
10
votes
4answers
543 views
When is Hannukah?
Input
The input will be a year between 1583 and 2239. We just want to know when Hannukah was or will be in that year. This is information used by millions of people every year and put in calendars ...
19
votes
11answers
3k views
Advent calendar
Let's build an advent Calendar for this Christmas!
Many Advent calendars for children take the form of a large rectangular card with numbered windows for each day of December starting from 1 ( ...
4
votes
8answers
398 views
Give me the first day of next month
Simple question!
Given a string that contains a date in ISO8601 format, print the first of the next month in ISO8601 format.
Example inputs:
2018-05-06
...
88
votes
45answers
17k views
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 ...
1
vote
1answer
264 views
Find all possible dates [closed]
You get a string which contains an integer between 1000 and 99999999 as input. The input string might contain leading zeroes but ...
25
votes
34answers
3k views
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 ...
16
votes
10answers
1k views
Digit Date Range
NOTE: Since I'm Dutch myself, all dates are in the Dutch dd-MM-yyyy format in the challenge description and test cases.
Challenge:
Inputs:
Start date \$s\$; End ...
2
votes
0answers
161 views
Rotated analog clock [closed]
Given:
a 12 hour time t in hours and minutes,
a rotation r in degrees,
return the time shown when an analog clock that is ...
59
votes
13answers
8k views
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 ...
6
votes
20answers
625 views
Get delta of days by current hour and added delta of days
Inputs:
current hour: from 0 to 23 (inclusive)
delta of hours: [current hour] + ...
24
votes
5answers
592 views
How long's left?
How long's left?
Recently, I was making pizza using a 5-minute timer on my phone. When someone walked in and asked me how long was left, I was confused for a moment at first as to how to answer the ...
10
votes
17answers
1k views
Tesco's Burger Relish Best Before End date number
Given a date between 2010-01-01 and 2099-12-31 as three integers (please state your order if not [year,month,day]), answer with Tesco's corresponding five-digit ...
25
votes
19answers
3k views
Analog is Obtuse!
An analog clock has 2 hands*: Hour and minute.
These hands circle the clock's face as time goes by. Each full rotation of the minute hand results in 1/12th of a rotation of the hour hand. 2 full ...
-1
votes
14answers
588 views
FizzBuzz but time-based
Make a program that outputs the number of seconds from the beginning of today (00:00:00 of the day you run it) to the second you ran it. However, if this number is divisible by three, print ...
-6
votes
10answers
248 views
The year counter is here [closed]
Create a program that, given an integer N, outputs the number of years we have to get to N A.D. or how many years it has been since N A.D, as a string or int. For example, given 2014, the program ...
8
votes
7answers
796 views
Output the date in the Mel calendar
The Mel calendar is used in the fictional world of Kaldia. Your goal is to convert dates into the Mel calendar.
This calendar has 13 months of 28 days each, plus 1 or 2 extra days after the last ...
36
votes
14answers
2k views
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 ...
