[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

[OT] Important Issue with "TIME" as we had with Y2K.



Dear User,

In my previous article published in darpan 28/04/06 I mentioned  “ technology is changing rapidly and there could be some unanticipated issues”, so here is the time to look into one...

"Date" is one of the well known representation of "Time" and plays a critical role in our life. Just for an example our financial transactions, Important events, various schedules etc. all are directly related to "date/time", similarly it plays an important role in IT industry, our system uses date for various purposes e.g. various updates, application/program execution, backup schedules etc. etc. etc. and hence any variation, misrepresentation, error may lead to a great consequences. I hope you all remember Year 2000(Y2K) problem, just for ready reminder - in fact it was the way we represent "date" i.e. 05/05/75 is 5th May 1975, so date could be of maximum two digits(01-31), month could be of maximum two digits(01-12) but year needs to be four digits till "9999" and hence system could have gone haywire after the midnight of 31st December 1999 when the date was 01/01/00. This was what??? start of the first century or the twenty first century(1st January 2000)???, this misrepresentation and use had a great implications!!! but things were controlled soon with the change in this format, you all know that.

But, why I am discussing all these???  OK, let me tell you another such an issue its "Year 2038 Problem", just go through this article which I have received long ago in a LINUX user group from Mr.Nitin Gupta, CEO, Xaprio Solutions.
               ------------ SNIP ---------------
The Year 2038 Problem, Test it now...
Disclaimer : This is just for FYI only. This  is true and if you do this do at your own risk!!!
1. login to yahoo messenger(YM)/Gaim
2. send instant message to anyone - fine its working...
3. now, change your system date to 19-Jan-2038, 03:14:07 AM or above
4. Confirm weather your date is changed
5. again send instant message to anyone...
Your YM/GAIM crashes ...
* * YES ALL NETWORK BASED APPLICATION WILL NOT WORK NOW AND YOU MAY FACE ISSUES WITH OTHERS * *

Why...,  What is it?
Starting at GMT 03:14:07, Tuesday, January 19, 2038, It is expected to see lots of systems around the world breaking magnificently: satellites falling out of orbit, massive power outages (like the 2003 North American blackout), hospital life support system failures, phone system interruptions, banking errors, etc. One second after this critical second, many of these systems will have wildly inaccurate date settings, producing all kinds of unpredictable consequences. In short, many of the dire predictions for the year 2000 are much more likely to actually occur in the year 2038!

Consider the year 2000 just a dry run. In case you think we can sit on this issue for another 30 years before addressing it, consider that reports of temporal echoes of the 2038 problem are already starting to appear in future date calculations for mortgages and vital statistics! In the first month of the year 2038 C.E. many computers will encounter a date-related bug in their operating systems and/or in the applications they run. This can result in incorrect and wildly  inaccurate dates being reported by the operating system and/or applications. The effect of this bug is hard to predict, because many applications are not prepared for the resulting "skip" in reported time anywhere from 1901 to a "broken record" repeat of the reported time at the second the bug occurs. Also, may make some small adjustment to the actual time the bug expresses itself. This bug to cause serious problems on many platforms, especially Unix and Unix-like platforms, because these systems will "run out of time".
 
What causes it?
Time_t is a data type used by C and C++ programs to represent dates and times internally. (Windows programmers out there might also recognize it as the basis for the CTime and CTimeSpan classes in MFC.) time_t is actually just an integer, a whole number, that counts the number of seconds since January 1, 1970 at 12:00 AM Greenwich Mean Time. A time_t value of 0 would be 12:00:00 AM (exactly midnight) 1-Jan-1970, a time_t value of 1 would be 12:00:01 AM (one second after midnight) 1-Jan-1970, etc..

some example times and their exact time_t representations:
Date & time time_t representation
1-Jan-1970, 12:00:00 AM GMT 0
1-Jan-1970, 12:01:00 AM GMT 60
1-Jan-1970, 01:00:00 AM GMT 3 600
2-Jan-1970, 12:00:00 AM GMT 86 400
1-Jan-1971, 12:00:00 AM GMT 31 536 000
1-Jan-1972, 12:00:00 AM GMT 63 072 000
1-Jan-2038, 12:00:00 AM GMT 2 145 916 800

By the year 2038, the time_t representation for the current time will be over 2 140 000 000. And that's the problem. A modern 32-bit computer stores a "signed integer" data type, such as time_t, in 32 bits. The first of these bits is used for the positive/negative sign of the integer, while the remaining 31 bits are used to store the number itself.
 
The highest number these 31 data bits can store works out to exactly 2 147 483 647. A time_t value of this exact number, 2 147 483 647, represents January 19, 2038, at 7 seconds past 3:14 AM Greenwich Mean Time. So, at 3:14:07 AM GMT on that fateful day, every time_t used in a 32-bit C  or C++ program will reach its upper limit. One second later, on 19-January-2038 at 3:14:08 AM GMT, disaster strikes. When a signed integer reaches its maximum value and then gets incremented, it wraps around to its lowest possible negative value. This means a 32-bit signed integer, such as a time_t, set to its  maximum value of 2 147 483 647 and then incremented by 1, will become -2 147 483 648. Note that "-" sign at the beginning of this large number. A time_t value of -2 147 483 648 would represent December 13, 1901 at 8:45:52 PM GMT. So, if all goes normally, 19-January-2038 will suddenly become 13-December-1901 in every time_t across the globe, and every date calculation based on this figure will go haywire. And it gets worse. Most of the support functions that use the time_t data type cannot handle negative time_t values at all. They simply fail and return an error code.

Solution
"The best way to predict the future is to engineer it." Consider testing your mission-critical code well ahead of time on a non-production test platform set just before the critical date. For more general applications, just using large types for storing dates will do the trick in most cases. For example, in GNU C, 64-bits (a "long " type) is sufficient to keep the time from rolling over for literally geological eons This just means any executables the operating systems runs will always get the correct time reported to them when queried in the correct manner.  It doesn't stop the executables you may still want to be worried about Well-written programs can simply be recompiled with a new version of the library that uses, for example, 8-byte values for the storage format. This is possible because the library encapsulates the whole time activity with its own time types and functions (unlike most mainframe programs, which did not standardize their date formats or calculations). So the Year 2038 problem should not be nearly as hard to fix as the Y2K problem was.

Admittedly, some don't feel that this impending disaster will strike too many people. They reason that, by the time 2038 rolls around, most programs will be running on 64-bit or even 128-bit computers. In a 64-bit program, a time_t could represent any date and time in the future out to 292 000 000 000 A.D., which is about 20 times the currently estimated age of the universe. The problem with this kind of optimism is the same root problem behind most of the Year 2000 concerns that plagued the software industry in previous years: Legacy Code. Even if every PC in the year 2038 has a 64-bit CPU, there will be a lot of older 32-bit programs running on them.  The greatest danger with the Year 2038 Problem is its invisibility. The more-famous Year 2000 is a big, round number; it only takes a few seconds of thought, even for a computer-illiterate person, to imagine what might happen when 1999 turns into 2000. But January 19, 2038 is not nearly as  obvious. Software companies will probably not think of trying out a Year 2038 scenario before doomsday strikes. Of course, there will be some warning ahead of time. Scheduling software,billing programs, personal reminder calendars, and other such pieces of code that set dates in the near future will fail as soon as one of their target dates exceeds 19-Jan-2038, assuming a time_t is used to store them.
               ------------ SNIP ---------------
OK, so by that time I don't know where we will be and what would be the technology, but the message is clear. In the last let Me ask you a very interesting question...

could you tell me what was the day of the week on 3rd Sept. 1752 ? No!!!, OK, then have a choice and tell me for any of these 5th Sept. 1752, 9th Sept. 1752, 12th Sept. 1752.

regards,

Bimal Pandit




[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]