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[英]Calculate the number of days between two dates in C – Convert date to days
[英]Getting difference between two dates in number of days?
比較兩天時,我得到的日子不正確。 在這里,我得到699天而不是730天,而dd=14,mm=8,yy=2014
time_t t1, t2;
struct tm my_target_date;
my_target_date.tm_sec = 0;
my_target_date.tm_min = 0;
my_target_date.tm_hour = 0;
my_target_date.tm_mday = 14;
my_target_date.tm_mon = 8;
my_target_date.tm_year = 112; /* Date today */
t1 = mktime (&my_target_date);
t2 = time (NULL);
sprintf (sbuff2,"Number of days since target date : %ld\n", (t2 - t1) / 86400);
在struct tm
,
int tm_mday; // day of the month — [1, 31]
int tm_mon; // months since January — [0, 11]
tm_mday
從1
開始,但tm_mon
從0
開始。 因此, my_target_date.tm_mon = 8;
實際上是九月,您要休假一個月。
struct tm
結構是-
struct tm {
int tm_sec; /* seconds */
int tm_min; /* minutes */
int tm_hour; /* hours */
int tm_mday; /* day of the month */
int tm_mon; /* month */
int tm_year; /* year */
int tm_wday; /* day of the week */
int tm_yday; /* day in the year */
int tm_isdst; /* daylight saving time */
};
tm結構的成員是:
tm_sec The number of seconds after the minute, normally in the range 0 to 59, but can be up
to 60 to allow for leap seconds.
tm_min The number of minutes after the hour, in the range 0 to 59.
tm_hour The number of hours past midnight, in the range 0 to 23.
tm_mday The day of the month, in the range 1 to 31.
tm_mon The number of months since January, in the range 0 to 11.
tm_year The number of years since 1900.
tm_wday The number of days since Sunday, in the range 0 to 6.
tm_yday The number of days since January 1, in the range 0 to 365.
tm_isdst A flag that indicates whether daylight saving time is in effect at the time
described. The value is positive if daylight saving time is in effect, zero if it is
not, and negative if the information is not available.
如果將輸入設為dd=14,mm=8,yy=2014
,則表示輸入dd=14,mm=8,yy=2014
9月14日,因為在tm_mon
month中從0
開始。 因此它將計算從September 14th 2014
的天數。 因此您在這31天之間不見了。
輸入為dd=14,mm=7,yy=2014
。
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