\datethis
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\datethis
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\def\title{ABSTIME}
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\def\title{ABSTIME}
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@* Intro. This tiny program prints the number of seconds
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@* Intro. This tiny program prints the number of seconds
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elapsed since 00:00:00 Greenwich Mean Time
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elapsed since 00:00:00 Greenwich Mean Time
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on January 1, 1970. (Greenwich Mean Time is now more properly
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on January 1, 1970. (Greenwich Mean Time is now more properly
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called Coordinated Universal Time, or UTC.)
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called Coordinated Universal Time, or UTC.)
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On January 19, 2038, at 03:14:08 UTC,
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On January 19, 2038, at 03:14:08 UTC,
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a 32-bit signed integer will become too small to hold the
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a 32-bit signed integer will become too small to hold the
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desired result. (The number of elapsed seconds will then be $2^{31}$.)
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desired result. (The number of elapsed seconds will then be $2^{31}$.)
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This program will still work on
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This program will still work on
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January 20 of that year if it has been compiled
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January 20 of that year if it has been compiled
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with a \CEE/ compiler that has type \&{time\_t}
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with a \CEE/ compiler that has type \&{time\_t}
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equivalent to \&{long}, provided that \&{long} integers
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equivalent to \&{long}, provided that \&{long} integers
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hold more than 32 bits.
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hold more than 32 bits.
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@c
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@c
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#include
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#include
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#include
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#include
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@#
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@#
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main()
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main()
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{
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{
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printf("#define ABSTIME %ld\n",time(NULL));
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printf("#define ABSTIME %ld\n",time(NULL));
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return 0;
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return 0;
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}
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}
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