Questions tagged [date]
This challenge is intended to be solved by using, manipulating, accepting as input, outputting, or calculating calendar dates or clock times.
292 questions
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Verify a Chinese ID Number
Verify a Chinese ID Number
The Resident Identity Card (居民身份证) is a document issued to most Chinese citizens. It contains information about its holder, including their name, address, and ID number, an ...
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Write a program that shows the time until the expiration of Trump's presidential term in milliseconds [closed]
The RULES
Each submission must be a full program.
The program takes no input and prints the time in milliseconds until Trump leaves office to the standard output. So pretty much the title. Write a ...
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A broken clock is right n times a day
You will be provided with a string containing a digital clock. You must determine how many times per day that clock could be correct. You can ignore daylight savings time. You do not know if the clock ...
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When is my coworker's next birthday?
inspired by this post.
Consider 2 coworkers who work Monday - Friday, every week of every year, with no breaks or national holidays.
On day n (day, month and year), worker 1 asks worker 2 their ...
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Antiparallel 12-hour Clock Hands
Output (or print) each of the 11 times, one per line, in the POSIX %I:%M:%S format, at which the hour and minute hands of a 12-hour clock are antiparallel. Here <...
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Where is it midnight?
With the passing of ex-president Jimmy Carter, a meme twitter account titled "Did Jimmy Carter Die Today?" erroneously tweeted the usual "No":
Some commenters argued that the post ...
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When is Daylight Saving Time?
In the United States, Daylight Saving Time starts on the second Sunday of March, and ends on the first Sunday of November.
Write the shortest full program, function, or code snippet that does the ...
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Find a datetime that works for everyone
Given a list of datetime ranges, write the shortest program/function/code snippet that returns a single datetime that is within all ranges, or some falsey value if no such datetime exists, i.e. a ...
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Fast leap year check
The task is to find parameters that make a fast leap year check correct for the widest range of years.
We assume the Proleptic Gregorian calendar, which extends the Gregorian calendar backward from ...
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Is it a date format of YYMMDD, MMDDYY, and/or DDMMYY?
The date format varies between countries; the arrangement of date, month and year can be categorized into these three:
Year-month-date
Month-date-year
Date-month-year
In Gregorian calendar it's year ...
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How many people are awake?
The following data contains the (approximate) population of each UTC timezone in the world (source):
...
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Format Datetime in 30-Hour Clock Time
Input a datetime, format the datetime in YYYY-MM-DD HH:mm:ss format using 30-hour clock time.
The 30-hour clock time works as:
After 6 a.m., it is same as 24-hour ...
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Output 5-line calendar
Given year, month and optionally weekday of 1st, output the calendar of the month. The first week should remain nonempty.
For empty cell, fill it with the date where it's supposed to be, in last or ...
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Write the date in abbreviated Latin
Inspired by How do you write dates in Latin?
Challenge
Given a month-and-day date, output that date in abbreviated Latin, as explained below.
Input
Input is flexible, following conventions from other ...
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Decode the date in Christmas Eve format
This is the inverse of "Encode the date in Christmas Eve format."
Write a program that takes as input the string Christmas, possibly followed by ...
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