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Date script
- Thread starter navink123
- Start date
navink123,
The script I use is:
#!/bin/sh
# ydate: A Bourne shell script that
# prints yestarday's date
# Output Form: Month Day Year
# Set the current month day and year.
month=`date +%m`
day=`date +%d`
year=`date +%y`
# Add 0 to month. This is a
# trick to make month an unpadded integer.
month=`expr $month + 0`
# Subtract one from the current day.
day=`expr $day - 1`
# If the day is 0 then determine the last
# day of the previous month.
if [ $day -eq 0 ]; then
# Find the preivous month.
month=`expr $month - 1`
# If the month is 0 then it is Dec 31 of
# the previous year.
if [ $month -eq 0 ]; then
month=12
day=31
year=`expr $year - 1`
# If the month is not zero we need to find
# the last day of the month.
else
case $month in
1|3|5|7|8|10|12) day=31;;
4|6|9|11) day=30;;
2)
if [ `expr $year % 4` -eq 0 ]; then
if [ `expr $year % 400` -eq 0 ]; then
day=29
elif [ `expr $year % 100` -eq 0 ]; then
day=28
else
day=29
fi
else
day=28
fi
;;
esac
fi
fi
MNTH=$month
if [ $MNTH -lt 10 ]
then
month=0$month
fi
DAY=$day
if [ $DAY -lt 10 ]
then
day=0$day
fi
# Print the month day and year.
echo $month"/"$day"/"$year
exit 0
I believe I actually found this from a post at Tek-Tips, but I cannot remember who it was from. I made a few modifications to get the output to be the way I wanted it to be.
John
The script I use is:
#!/bin/sh
# ydate: A Bourne shell script that
# prints yestarday's date
# Output Form: Month Day Year
# Set the current month day and year.
month=`date +%m`
day=`date +%d`
year=`date +%y`
# Add 0 to month. This is a
# trick to make month an unpadded integer.
month=`expr $month + 0`
# Subtract one from the current day.
day=`expr $day - 1`
# If the day is 0 then determine the last
# day of the previous month.
if [ $day -eq 0 ]; then
# Find the preivous month.
month=`expr $month - 1`
# If the month is 0 then it is Dec 31 of
# the previous year.
if [ $month -eq 0 ]; then
month=12
day=31
year=`expr $year - 1`
# If the month is not zero we need to find
# the last day of the month.
else
case $month in
1|3|5|7|8|10|12) day=31;;
4|6|9|11) day=30;;
2)
if [ `expr $year % 4` -eq 0 ]; then
if [ `expr $year % 400` -eq 0 ]; then
day=29
elif [ `expr $year % 100` -eq 0 ]; then
day=28
else
day=29
fi
else
day=28
fi
;;
esac
fi
fi
MNTH=$month
if [ $MNTH -lt 10 ]
then
month=0$month
fi
DAY=$day
if [ $DAY -lt 10 ]
then
day=0$day
fi
# Print the month day and year.
echo $month"/"$day"/"$year
exit 0
I believe I actually found this from a post at Tek-Tips, but I cannot remember who it was from. I made a few modifications to get the output to be the way I wanted it to be.
John
/*
* dateutil.c
*
* Manipulates dates
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
//#define DEBUG
//#define DEBUG2
char *Months[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
int Date_Format=0;
int get_year(int *yy)
{
struct tm *tm;
time_t ltime;
time( <ime );
tm = localtime( <ime );
*yy = tm->tm_year;
if (*yy < 1900)
*yy += 1900;
return 1;
}
int get_datetime(char *sdate, char *stime)
{
struct tm *tm;
time_t ltime;
int yy;
time( <ime );
tm = localtime( <ime );
yy = tm->tm_year;
if (yy < 1900)
yy += 1900;
sprintf(sdate, "%02d/%02d/%04d",
tm->tm_mday, tm->tm_mon+1, yy);
sprintf(stime, "%02d:%02d:%02d",
tm->tm_hour, tm->tm_min, tm->tm_sec);
return 1;
}
/*
* input data is in YYYYMMDD format. Returns y,m,d as integers
*/
int parse_normalized_date(char *sdate, int *y, int *m, int *d)
{
char str[9];
if (strlen(sdate) != 8)
return 0;
memcpy(str, sdate, 4);
str[4] = 0;
*y = atoi(str);
memcpy(str, &sdate[4], 2);
str[2] = 0;
*m = atoi(str);
memcpy(str, &sdate[6], 2);
str[2] = 0;
*d = atoi(str);
return 1;
}
int parse_date(char *dat_in, char *dat)
{
const char delm[] = "-/. ";
char s[32], *p;
int fmt_ymd, i, j, found, a, b, c, yy, mm, dd;
#ifdef DEBUG2
printf("parse_date(%s)\n", dat_in);
#endif
strncpy(s, dat_in, 31);
s[31] = 0;
/* check for date in the form "Nov 19" or "19 Nov" */
found = 0;
for (i=0; i<12; i++)
{
if ((p = strstr(s, Months)) != NULL)
{
found = 1;
break;
}
}
if (found)
{
j = p - s;
if (j == 0)
{
mm = i+1;
sscanf(&p[4], "%d", &dd);
}
else
{
sscanf(s, "%d", &dd);
mm = i+1;
sscanf(&p[4], "%d", &yy);
}
if (yy == 0)
{
get_year(&yy);
}
goto done;
}
/* date is in numerical form YYYY-MM-DD */
if (strchr(s, '-') != NULL)
fmt_ymd = 1;
else
fmt_ymd = 0;
/* date is in numerical form MM/DD/YYYY */
p = strtok(s, delm);
if (!p) return 0;
a = atoi(p);
p = strtok(NULL, delm);
if (!p) return 0;
b = atoi(p);
p = strtok(NULL, delm);
if (!p) return 0;
c = atoi(p);
if (fmt_ymd || a > 1900)
{
yy = a;
mm = b;
dd = c;
}
else
{
dd = a;
mm = b;
yy = c;
}
done:
if (yy < 100 && yy >= 70)
yy += 1900;
else if (yy < 70)
yy += 2000;
sprintf(dat, "%04d%02d%02d", yy, mm, dd);
#ifdef DEBUG2
printf("(%s)\n", dat);
#endif
return 1;
}
/*
* converts date from human format to Unixdate format
*/
int str2unixdate(char *sdate, int *udate)
{
char norm_date[9];
int y, m, d;
struct tm when;
time_t secs;
if (!parse_date(sdate, norm_date))
return 0;
if (!parse_normalized_date(norm_date, &y, &m, &d))
return 0;
memset(&when, 0, sizeof(when));
when.tm_year = y - 1900;
when.tm_mon = m - 1;
when.tm_mday = d;
if ((secs = mktime(&when)) == (time_t)-1)
return 0;
*udate = secs;
return 1;
}
int today(char *sdate2)
{
char sdate[12], stime[12], sdate1[12];
int y, m, d;
get_datetime(sdate, stime);
parse_date(sdate, sdate1);
parse_normalized_date(sdate1, &y, &m, &d);
if (Date_Format == 0)
sprintf(sdate2, "%04d-%02d-%02d", y, m, d);
else
else
sprintf(sdate2, "%02d/%02d/%04d", d, m, y);
return 1;
}
int date_add(char *sdate, int days, char *sdate2)
{
char norm_date[9];
int y, m, d;
struct tm when, *newtime;
time_t secs, secs2;
if (!parse_date(sdate, norm_date))
return 0;
if (!parse_normalized_date(norm_date, &y, &m, &d))
return 0;
memset(&when, 0, sizeof(when));
when.tm_year = y - 1900;
when.tm_mon = m - 1;
when.tm_mday = d;
if ((secs = mktime(&when)) == (time_t)-1)
return 0;
secs2 = secs + days*1440*60;
newtime = localtime(&secs2);
if (Date_Format == 0)
sprintf(sdate2, "%04d-%02d-%02d",
newtime->tm_year+1900, newtime->tm_mon+1, newtime->tm_mday);
else
sprintf(sdate2, "%02d/%02d/%04d",
newtime->tm_mday, newtime->tm_mon+1, newtime->tm_year+1900);
return 1;
}
void usage(char *progname)
{
printf("usage: %s <operation> [<arguments> ...]\n", progname);
printf("operations:\n"
;printf(" unix <date> - returns unix date\n"
;printf(" add <date> <days> - adds days to given date\n"
;printf(" today [<days>] - adds days to today's date (if days not specified, returns today's date)\n"
;printf("format:\n"
;printf(" <date> : YYYY-MM-DD or DD/MM/YY[YY] or DD.MM.YY[YY]\n"
;printf(" <days> : integer (may be negative)\n"
;}
int main(int argc, char *argv[])
{
int udate, days;
char sdate[12], sdate0[12];
if (argc < 2)
goto err;
if (argc == 3 && strcmp(argv[1], "unix"
== 0){
udate = 0;
if (!str2unixdate(argv[2], &udate))
goto err;
fprintf(stdout, "%d\n", udate);
}
else if (argc == 4 && strcmp(argv[1], "add"
== 0){
days = atoi(argv[3]);
if (!date_add(argv[2], days, sdate))
goto err;
fprintf(stdout, "%s\n", sdate);
}
else if ((argc == 2 || argc == 3) && strcmp(argv[1], "today"
== 0){
if (argc == 3)
days = atoi(argv[2]);
else
days = 0;
if (!today(sdate0))
goto err;
if (!date_add(sdate0, days, sdate))
goto err;
fprintf(stdout, "%s\n", sdate);
}
else
goto err;
return 0;
err:
usage(argv[0]);
return 1;
}
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