Put the date into characters? I defined the type of input : 2002-08-10 date in the form of how to judge the validity date? For example : If I illicit importation of other characters (such as : s0f0-02-ds), the date of importation is how to ensure I correct? How to judge? Put the date into characters? What in your programming environment. Put the date into characters? 5.05 SCO UNIX environment Put the date into characters? /***********************************************************************/ LEAVES OF 13 SPECIES OF LAURACEAE IsRunNian */ function name : LEAVES OF 13 SPECIES OF LAURACEAE function : to decide whether or not to introduce Runnian */ LEAVES OF 13 SPECIES OF LAURACEAE format : int IsRunNian Call (i_year) */ LEAVES OF 13 SPECIES OF LAURACEAE input parameters : i_year Year (yyyy) */ LEAVES OF 13 SPECIES OF LAURACEAE return is a leap year : 1 -- */ LEAVES OF 13 SPECIES OF LAURACEAE -1 -- not a leap year */ /***********************************************************************/ Int IsRunNian (int i_year) { If (((i_year%4==0) & (i_year%100!=0)) | | (i_year%400==0)) return 1; Return 1; } /***********************************************************************/ LEAVES OF 13 SPECIES OF LAURACEAE CheckDate */ function name : LEAVES OF 13 SPECIES OF LAURACEAE : functional check on the legality of the date of importation */ LEAVES OF 13 SPECIES OF LAURACEAE Calling format : int CheckDate (s_date) */ LEAVES OF 13 SPECIES OF LAURACEAE s_date input parameters : Date (format yyyymmdd) */ LEAVES OF 13 SPECIES OF LAURACEAE legitimate */ return : 0 -- LEAVES OF 13 SPECIES OF LAURACEAE other -- not legitimate */ /***********************************************************************/ Int CheckDate (char *ylq) { Int i, y, m, d, Int mouth_date[13]={0,31,28,31,30,31,30,31,31,30,31,30,31}; Int rc;    Char s_date[10]; Char ylq5[5]; If (strlen (ylq) !=10) return 1; Strncpy (s_date, ylq,4) ;strncpy (ylq5, ylq+5,2) ;strcat (s_date, ylq5); Strncpy (ylq5, ylq+8,2) ;strcat (s_date, ylq5);    For (i=0;i<8;i++) if (!isdigit (s_date[i])) return 2; I=sscanf (s_date "%4d%2d%2d" &y, &m, &d); If (i!=3) return 3; If (m<1||m>;12) return 5.00 Rc=IsRunNian (y); If (m==2, named rc==1) if (d>;29 | | d<1) return 6; Else if (d>;mouth_date[m] | | d<1) return 7; Return 0 } Put the date into characters? Alright. [ Closed window ]