?
Solved

The 2038 bug

Posted on 2008-06-18
4
Medium Priority
?
303 Views
Last Modified: 2010-04-15
My curiosity recently brought me to analyse what is the exact nature of the 2038 date problem.

Well as you all probably know, it comes from the limitation in the C standard library type 'time_t' which is usually defined as a 32 bits signed integer.

The time_t type is defined by the C standard to contain "the number of seconds elapsed since January 1, 1970, 00:00:00". The C documentation says it can contain dates up to January 18, 2038, 19:14:07.

But when I calculate the number of seconds a 32 bits signed integer can contain, I come to the number 2147483647, which is 24855 days, 3 hours, 14 minutes and 7 seconds. Adding this value to January 1, 1970, 00:00:00 gives the following date: January 19, 2038, 03:14:07

So how can you explain the difference between the C documentation date and the calculated date ?
0
Comment
Question by:stsanz
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 21815581
Are you sure you included all leap years correctly in your calculation?
0
 
LVL 53

Expert Comment

by:Infinity08
ID: 21815590
>> The C documentation says it can contain dates up to January 18, 2038, 19:14:07.

What timezone was that documentation for ?
0
 
LVL 53

Accepted Solution

by:
Infinity08 earned 500 total points
ID: 21815662
>> January 19, 2038, 03:14:07

That's the highest UTC date/time that can be represented by a signed 32bit time_t.

>> January 18, 2038, 19:14:07

That would thus be the highest date/time in UTC-8.
0
 
LVL 6

Author Comment

by:stsanz
ID: 21815674
Well I found all the explanations here :
http://en.wikipedia.org/wiki/Year_2038_problem

Thanks for your comments
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Summary: This tutorial covers some basics of pointer, pointer arithmetic and function pointer. What is a pointer: A pointer is a variable which holds an address. This address might be address of another variable/address of devices/address of fu…
Windows programmers of the C/C++ variety, how many of you realise that since Window 9x Microsoft has been lying to you about what constitutes Unicode (http://en.wikipedia.org/wiki/Unicode)? They will have you believe that Unicode requires you to use…
The goal of this video is to provide viewers with basic examples to understand and use structures in the C programming language.
Video by: Grant
The goal of this video is to provide viewers with basic examples to understand and use for-loops in the C programming language.
Suggested Courses

801 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question