size_t strftime(char *strDest, size_t maxsize, const char *format, const struct tm *timeptr);
Parameter:
strDest: chuỗi kí tự đầu ra
maxsize: kích thước strDest (tính theo số kí tự)
format: định dạng của chuỗi kí tự
%a: Abbreviated weekday name
%A: Full weekday name
%b: Abbreviated month name
%B: Full month name
%c: Date and time representation appropriate for locale
%d: Day of month as decimal number (01 – 31)
%H: Hour in 24-hour format (00 – 23)
%I: Hour in 12-hour format (01 – 12)
%j: Day of year as decimal number (001 – 366)
%m: Month as decimal number (01 – 12)
%M: Minute as decimal number (00 – 59)
%p: Current locale’s A.M./P.M. indicator for 12-hour clock
%S: Second as decimal number (00 – 59)
%U: Week of year as decimal number, with Sunday as first day of week (00 – 53)
%w: Weekday as decimal number (0 – 6; Sunday is 0)
%W: Week of year as decimal number, with Monday as first day of week (00 – 53)
%x: Date representation for current locale
%X: Time representation for current locale
%y: Year without century, as decimal number (00 – 99)
%Y: Year with century, as decimal number
%z, %Z: Either the time-zone name or time zone abbreviation, depending on registry settings; no characters if time zone is unknown
%%: Percent sign
timeptr: thời gian lưu trong struct tm
Remark:
Hàm strftime( ) trả về số kí tự được đặt trong strDest
- Nếu tổng số ki tự + 1 kí tựu NULL mà lớn hơn maxsize, hàm trả về 0 và nội dung của strDest không chính xác.
Ví dụ:
#include "stdio.h" #include "conio.h" #include "time.h" void main( void ) { time_t ltime; struct tm *info; char str_time[120]; time(<ime); info = localtime(<ime); strftime(str_time, 120, "Today is %A, %d/%m/%Y.", info); printf("\n%s", str_time); getch(); }
Kết quả:
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