This challenge is intended to be solved by using, manipulating, accepting as input, outputting, or calculating calendar dates or clock times.
6
votes
3answers
270 views
World Time Conversion
World Time Conversion
Challenge:
Given an initial clock time in UTC and a list of countries: for each country in the list, output the local time it is in that country based on the initial time. In ...
17
votes
10answers
611 views
Change the Timezone
Challenge
Given a time and a timezone as input, output the time in that timezone.
Time
The time will be given in 24 hour format like so:
hh:mm
Where hh is the two digit hour and mm is the two ...
3
votes
1answer
167 views
Are you a Fanatic?
Write a function or program that awards you SE badges. If an input "Q" is given it means you have asked a question. If no input is given it means you have only visited the site.*
Badges it must ...
6
votes
3answers
223 views
When is their birthday?
Donald Knuth was born in 1938, on the 20th day of Capricorn.
The first day of Capricorn is the 22nd December.
Donald Knuth was born on the 10th of January (1938).
The challenge
Write a program or ...
32
votes
49answers
6k views
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 ...
19
votes
18answers
2k views
Sort the months of the year
Write a function or program that takes string inputs, fully-spelled, English month names in title case: January, February, March, etc. (null/CR/LF terminated OK, delimited with some non-alpha ...
8
votes
6answers
361 views
A Fractional Year
My PPCG holiday is over :D
Intro
Fractional time is the year + (the value (minute of year) / number of minutes in the year).
Example calculation
You should assume that February always has 28 days ...
22
votes
13answers
2k views
Prime Wednesdays
Prime Wednesdays
Your task is to count the number of Wednesdays that fall on a prime day of the month in a particular year. For instance, 7-13-16 is a prime Wednesday. For consistency use the ...
17
votes
10answers
2k views
Legalize Reversed Date
Input:
A Date (containing dd, MM and yyyy). A date-object, or three separate integers are also valid as input.
Output:
Each part (dd, MM and yyyy) individually reverted and than rounded to the ...
5
votes
4answers
294 views
Validating a CPR number
Validating a CPR number
A Danish CPR number (Person Identification Number) is date of birth followed by 4 digits (the last one being a control digit): DDMMYY-XXXX
The final digit validates the CPR ...
6
votes
11answers
369 views
Calculate Swatch Internet Time
Output the current time of day as Swatch Internet Time.
Specifically, output a three-digit (zero-padded) number of ".beats" (1000ths of a day) which represent the current time of day in the Swatch ...
5
votes
10answers
1k views
I hate Mondays!
You should a program in language X, which will only output its source code (i.e function as a quine) when it is not a monday. On monday it should output some string with a levehnstein distance of 4 ...
17
votes
13answers
1k views
Forecast Palindromic Dates
Palindromic dates are dates that appear as palindromes: the string of digits can be read the same way backwards as forwards. For the North American date format (MM/DD/YYYY), the next few palindromic ...
51
votes
32answers
5k views
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.
Rules:
The input will be a number or a string exactly 6 characters ...
63
votes
34answers
10k views
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 ...
9
votes
3answers
278 views
Simplify a Date
This is similar to simplifying fractions, but with Dates!
The input of your program must be of the form mm/dd
For example
3/4 //March 4
12/15 //December 15
1/1 // January 1
We assume that the input ...
12
votes
10answers
509 views
What's the Binary Time?
What's the Binary Time?
Everybody knows what the normal time is. It's up there in the top-right (or wherever you put it) of your screen. But a question people rarely seem to ask themselves is this: ...
21
votes
29answers
3k views
24 and 12 Hour Times
Write a program or function with no input that prints or returns this string of 24-hour and 12-hour times:
00:00 12:00am
01:00 1:00am
02:00 2:00am
03:00 3:00am
04:00 4:00am
05:00 5:00am
06:00 6:...
10
votes
1answer
166 views
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 ...
8
votes
3answers
570 views
420 <s>Blaze</s> Golf It
This is a pretty simple challenge, but (I hope) a fun one.
Task
If right now either the month is 4 and the day is 20, the hour (on a 12 hour clock) is 4 and the minute is 20, or the minute is 4 and ...
11
votes
1answer
215 views
Beat Pure Regular Expressions at Validating ISO 8601 Dates
In ValiDate ISO 8601 by RX, the challenge was to use only standard regular expressions to validate standard date formats and values (the former is a common job for RX, the latter was unusual). The ...
7
votes
2answers
197 views
Roman-style date formatting
Today (March 15) is the Ides of March, best known for being the date that Julius Caesar was assassinated.
What's “Ides”? Well, the ancient Romans didn't simply number the days of month from 1 to 31 ...
25
votes
37answers
7k views
Happy Rounded Pi Day
To celebrate Rounded Pi Day, you must take advantage of today's date to make a program that takes in a circle's diameter and outputs its circumference by multiplying the diameter by 3.1416, where 3....
3
votes
1answer
208 views
Graduation Meme Tally
Now that we're graduating, it's time to tally up the number of times someone suggested that PPCG was graduating, even before the annoucement! (see here)
Your program will receive a list of chat ...
4
votes
19answers
535 views
Read an analog clock
You are given the positions of the minute and hour hands of an analog clock as an angle of clockwise rotation from the top (12). So a hand pointing at 9 is at an angle if 270, and a hand pointing ...
17
votes
3answers
299 views
Generate lazy microwave input
Related: Program my microwave oven and Generate lazy values.
My colleague is so lazy that he doesn't even bother to move his finger when programming the microwave oven. (This is actually true!)
Help ...
3
votes
1answer
301 views
What time is it again? [closed]
The Inspiration
The Challenge
I'm tired of seeing the same old-same old clock in my top-right-hand corner of my screen. It's time for a new clock. While the clock clock sated my lack of interesting ...
-5
votes
15answers
666 views
Is the time linear?
I like patterns in time. My favorite is when the time lines up. For example, all of these line up:
3:45
12:34
23:45
3:21
6:54
This is because each digit in the hour/minute is increasing/decreasing ...
0
votes
0answers
66 views
Is it a leap year? Use only assignments and arithmetic expressions [duplicate]
Write a program that outputs 1 when the year is a leap year, otherwise 0. You can use any programming language, but use only assignments and arithmetic expressions for the calculation.
The Gregorian ...
2
votes
1answer
188 views
Convert string to time
This challenge is inspired by this other.
The challenge
Write a program or a function in any programming language that given as input a string representing a time in English (see below, for further ...
17
votes
6answers
380 views
Convert the Time to a String
Problem
One day, you boss walks up to you and tells you he needs to know the time. He still insists after you pointing at the clock directly above you head, and confesses he has a severe case of ...
14
votes
3answers
335 views
Check work periods
Introduction
Here in Germany the ruling on work times is very strict. If you work 6 or more hours a day, you have to take at least a 30 minute break. If you work 9 or more hours, you need to take a ...
12
votes
6answers
608 views
Calculate the day number of the year
Seems like we do not have this one yet, so here we go:
The Challenge
Write a program or function that takes a date as input and outputs the day number of the year. You may not use any builtins for ...
14
votes
9answers
479 views
Next public holiday
Australians love public holidays, and drinking. Yesterday, the 26th January, was Australia day, which is a public holiday. I was glad to not be at work yesterday, and eager to know the next time I get ...
10
votes
1answer
338 views
Calculate the Lunar Phase
Introduction
tl;dr
In this challenge you have to calculate the moon's phase for a given date.
This challenge is inspired by the game psycho social audiovisual experiment "Superbrothers: Sword & ...
11
votes
3answers
355 views
Superstitious Programming
Your challenge is extremely simple. Given a year as input, print all the months in that year that will contain a Friday the 13th according to the Gregorian calendar. Note that even though the ...
16
votes
11answers
1k views
Pi Day, Pi Minute, or Pi Second?
In this challenge you will need to determine whether it's Pi Day, Pi Minute, or Pi Second.
Because Pi is irrational, it wants your code to be as short as possible.
Examples
No input is provided, ...
8
votes
15answers
474 views
Chinese Zodiac of the year
2015 was the year of the goat! In this challenge, you will figure out which animal represents the year. To avoid making this challenge to complex you won't need to calculate Chinese new year.
Because ...
26
votes
16answers
1k views
ASCII clock with dot & comma time markers
Introduction
Imagine that line of chars is in fact two rows. Upper row - dots - represents hours (24 hour system), while lower - commas - represents minutes. One character can represent hour, minute ...
16
votes
2answers
350 views
Forgotten Realms date calculator
In an effort to level the playing field between languages with built-in date libraries and those without, let's work with a fictional calendar. The Forgotten Realms are a (the?) campaign setting for ...
1
vote
5answers
106 views
Parrot User’s Delay [duplicate]
A simple code golf challenge similar to an already existing, but more complex one:
Wait for user to press enter.
Wait for user to press enter again.
Print the elapsed time between the 1. and 2.
Wait ...
43
votes
7answers
2k views
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, ...
23
votes
7answers
581 views
Convert a date to 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, ...
17
votes
6answers
440 views
Rollover Calendar
This is inspired by one of Downgoat's questions in Sandbox, where I suggested that he include April 31 as Pi day for people who use day/month format, only for him to inform me that there is no April ...
13
votes
4answers
386 views
How many weeks?
Your task is to output a single number; the number of ISO weeks that a given date range intersects. To quote Wikipedia: An average year is exactly 52.1775 weeks long, but this is not about the average....
3
votes
2answers
176 views
Create a Winter Bash 2015 hat reminder
Input
Two dates, each comprising of a month (Dec or Jan) and a day (01-31). These will be given as 4 integers (12 01 01 01, for example), in any reasonable format you choose (leading zeroes, no ...
38
votes
31answers
4k views
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....
10
votes
20answers
2k views
How long ago was this?
How long ago was this?
The Rules
Each submission must be a full program.
The program must take input as two comma-separated dates in the form YYYY-MM-DD, and print the number of days that has passed ...
22
votes
50answers
2k views
Running length of the movie in a human readable format
Whenever I search for the running length of a movie in IMDb, it is displayed in minutes. Immediately I would try to convert it into hour(s) and minute(s). It would be better if we could automate this.
...
