CODEWITHSUNDEEP
c
Raju Mahato
Raju Mahato

Reputation: 129

What is size of the time variable in C programming?

What is the size of the time variable that are used to show datetime in bits ? Actually in time.h file the time variable that are used, are they store into int variable or what ?

Upvotes: 2

Views: 4975

Answers (3)

schot
schot

Reputation: 11268

From the C99 standard (7.23.1):
"The range and precision of times representable in clock_t and time_t are implementation-defined."

From the standard's perspective it might be an integer, floating point number, Huffman encoded , etc. In practice on most UNIX-like systems it will be a 32 or 64 bit unsigned integer signifing the number of seconds since the UNIX epoch (midnight Januari 1 1970).

Upvotes: 2

PeterK
PeterK

Reputation: 6317

Use sizeof( time_t ); to determine the size in bytes. Then multiply this number with bits per byte (usually 8, but depends on your HW).

Upvotes: 2

Matt Joiner
Matt Joiner

Reputation: 118620

On GCC (echo '#include <time.h>' | gcc -E -):

__extension__ typedef long int __time_t;
typedef __time_t time_t;

Platform details:

Linux stanley 2.6.32-24-generic-pae #39-Ubuntu SMP Wed Jul 28 07:39:26 UTC 2010 i686 GNU/Linux

Upvotes: 2

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