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comment Gauss' formula

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This commit is contained in:
Igor Sysoev
2008-04-10 09:37:12 +00:00
parent d52c878692
commit b8a71b6c1b
1 changed files with 14 additions and 5 deletions
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19
src/http/ngx_http_parse_time.c
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@@ -240,7 +240,7 @@ ngx_http_parse_time(u_char *value, size_t len)
/*
* shift new year to March 1 and start months from 1 (not 0),
* it is needed for Gauss's formula
* it is needed for Gauss' formula
*/
if (--month <= 0) {
@@ -248,11 +248,20 @@ ngx_http_parse_time(u_char *value, size_t len)
year -= 1;
}
/* Gauss's formula for Grigorian days from March 1, 1 BC */
/* Gauss' formula for Grigorian days since March 1, 1 BC */
return (365 * year + year / 4 - year / 100 + year / 400
+ 367 * month / 12 - 31
+ day
return (
/* days in years including leap years since March 1, 1 BC */
365 * year + year / 4 - year / 100 + year / 400
/* days before the month */
+ 367 * month / 12 - 30
/* days before the day */
+ day - 1
/*
* 719527 days were between March 1, 1 BC and March 1, 1970,