90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
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/***********************************************************************\
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* *
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* DATE.C Copyright (C) 1993 Sequiter Software Inc. *
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* *
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\***********************************************************************/
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/* See User's Manual, page 154 */
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#include "d4all.h"
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#ifdef __TURBOC__
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extern unsigned _stklen = 10000;
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#endif
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int valid_date(char *date)
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{
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long rc;
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rc = date4long(date);
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if(rc < 1)
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return 0;
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else
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return 1;
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}
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void how_long_until(int month,int day,char *title)
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{
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char today_standard[9],today[25],date[9],*dow;
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int year,days;
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long julian_today,julian_date;
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memset(today_standard,NULL
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,sizeof(today_standard));
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memset(today,NULL,sizeof(today));
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memset(date,NULL,sizeof(date));
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date4today(today_standard);
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date4format(today_standard,today
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,"MMM DD/CCYY");
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printf("\nToday's date is %s\n",today);
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julian_today = date4long(today_standard);
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year = date4year(today_standard);
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sprintf(date,"%4d%2d%2d",year,month,day);
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julian_date = date4long(date);
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if(julian_date < julian_today)
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{
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year ++;
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sprintf(date,"%4d%2d%2d",year,month,day);
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julian_date = date4long(date);
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}
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days = julian_date - julian_today;
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printf("There are %d days until %s"
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,days,title);
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dow = date4cdow(date);
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printf("(which is a %s this year)\n",dow);
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}
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void main()
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{
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char birthdate[80],standard[9];
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how_long_until(12,25,"Christmas");
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do
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{
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printf("\nPlease enter your birthdate");
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printf(" in \"DEC 20/1993\" format:");
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gets(birthdate);
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date4init(standard,birthdate,"MMM DD/CCYY");
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}while(!valid_date(standard));
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how_long_until(date4month(standard)
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,date4day(standard)
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,"your next birthday");
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}
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