parse-date: refactor tm_diff()
Reported-by: Ruediger Meier <ruediger.meier@ga-group.nl> Influenced-by: gnulib 30784c4 Paul Eggert <eggert@cs.ucla.edu> Signed-off-by: J William Piggott <elseifthen@gmx.com>
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@ -957,7 +957,7 @@ static table const * lookup_zone(parser_control const *pc, char const *name)
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* The body of this function is taken directly from the GNU C Library;
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* see src/strftime.c.
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*/
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static long int tm_diff(struct tm const *a, struct tm const *b)
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static int tm_diff(struct tm const *a, struct tm const *b)
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{
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/**
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* Compute intervening leap days correctly even if year is negative.
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@ -970,8 +970,7 @@ static long int tm_diff(struct tm const *a, struct tm const *b)
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int a400 = SHR (a100, 2);
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int b400 = SHR (b100, 2);
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int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
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int ayear = a->tm_year;
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int years = ayear - b->tm_year;
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int years = a->tm_year - b->tm_year;
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int days = (365 * years + intervening_leap_days
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+ (a->tm_yday - b->tm_yday));
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return (60 * (60 * (24 * days + (a->tm_hour - b->tm_hour))
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