How to convert time in seconds from 1970 from a text file to hours, min seconds and complete date?

Hi jhshukla,
Thanks for your answer.
Can you please give me a more detailed explanation?
Do I need the structures to make the conversion?
Is the FileTime the time in seconds ?
is there any example available?
Thanks.

Reference page for strftime :

        http://www.cplusplus.com/reference/clibrary/ctime/strftime.html

Hi Infinity 08,
Great solution!
I learned a lot from it!
1) The time for the seconds since 1970 was calculated as
time_t ltime;
time (&ltime);
So It's local time.
2) I changed the variable that holds the seconds to unsigned int.
3) Thanks for the remarks and the detailed explanations.

>> time (&ltime);
>> So It's local time.

That means that it's GMT actually ;)

Hi,
Yes it was my mistake its GMT/UTC time.
Thanks.

hi star90,
I know you already accepted the answer from infinity but still I will complete my explanation. his is the better answer (platform independence).

anyway here it goes:
FILETIME structure "contains a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601 (UTC)." The doc page recommends using ULARGE_INTEGER & 64-bit arithmetic instead of directly manipulating lowPart and highPart of the FILETIME struct.

example:

ULARGE_INTEGER raw;
FILETIME file_time;
SYSTEMTIME sys_time;
 
fscanf(file_ptr, "%I64", &raw.QuadPart);     /* read from the file */
raw.QuadPart *= 10000000;                    /* convert to 100-ns intervals */
file_time.dwLowDateTime = raw.lowPart;       /* copy to FILETIME in parts */
file_time.dwHighDateTime = raw.highPart;
FileTimeToSystemTime(&file_time, &sys_time); /* convert to year-month-day format */
 
printf("%4d/%02d/%02d", sys_time.wYear, sys_time.wMonth, sys_time.wDay);

                                              

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Hi jhshukla:
Thanks for your answer
I can't compile it since I am getting errors of undeclare identifiers, probably I didn't include the correct files.
Which files should be included?

windows.h

Hi jhshukla:
Thanks for your answer.
I stil however get errors:
'lowPart'  : is not a member of  'ULARGE_INTEGER'
'highPart' is not a member of  'ULARGE_INTEGER'

oops! my mistake. it's LowPart and HighPart.

VS 2008 specific:
if you get that kind of errors, right-click on "ULARGE_INTEGER" and then "Go to Definition." it will lead you to the code where the structure is defined and you can look around to see what else is offered. if you run into typedefs and #defines keep repeating until you find what you are looking for.
Also when you type '.' after the variable name, e.g. 'raw.', a list will pop-up showing the structure's members.
Another option (only for Windows® development) is to go to msdn.com and search for "ULARGE_INTEGER." replace "ULARGE_INTEGER" with whatever type you want to learn about.

Hi  jhshukla:,
Thanks for the explanation
I added the fopen command
fopen (file_ptr,"r");
before the fscan command in your code.
What do you put in the file?
a time lke 1204067242 makes the program crash : Expression:(stream !=NULL)

syntax of fopen can be found here: http://www.cplusplus.com/reference/clibrary/cstdio/fopen.html

FILE * file_ptr = fopen("your_file_name", "r");
fscanf(file_ptr, "%I64", &raw.QuadPart);

But If i want to convert  "20060622113856" into seconds then how i can do that.