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Full Discussion: Calculate given date - 1 day
Top Forums Shell Programming and Scripting Calculate given date - 1 day Post 302930729 by kmanivan82 on Tuesday 6th of January 2015 03:11:08 PM
Old 01-06-2015
Hi RavinderSingh13,

Need a modification in the output.

I have parameterized the code that you have given as follows.

Code:
	GetDate=$1
	echo $GetDate | awk -vs1="01" -vs2="03" -vs3="12" '{if(length($0)>8){print "Wrong Input!!";exit};YEAR=substr($0,1,4);YEAR+0;MONTH=substr($0,5,2);MONTH+0;DATE=substr($0,7,2);DATE+0;split("31 29 31 30 31 30 31 31 30 31 30 31", W," ");if(DATE==s1 && MONTH==s1){YEAR=YEAR-1; MONTH=12; DATE=31; print YEAR MONTH DATE}  else if(DATE==s1 && MONTH >= s1 && MONTH <= s3){MONTH=MONTH-1;W[2]=(YEAR%4!=0)?28:29;print YEAR MONTH W[MONTH]} else {DATE=DATE-1;print YEAR MONTH DATE}}'

if i exec the script by passing the date, the script will return previous date as output.

ksh date_check.ksh 20150106
2015015


The output is displayed correct. But I need the output day should be displayed in 2 digits. I am expecting the same output to be displayed as 20150105

Output should always be
year 4 digits
month 2 digits
day 2 digits

Can you help me out?

Last edited by rbatte1; 01-07-2015 at 06:08 AM.. Reason: Added CODE tags
 

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DATE(1) 						      General Commands Manual							   DATE(1)

NAME
date - print or set the date and time SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format] OPTIONS
-q Read the date from stdin -s Set the time (implicit for -q or a date string) -u Print the date as GMT -t Use this number of seconds instead of current time EXAMPLES
date # Print the date and time date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m. DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time, with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed by a printf-like string with the following options: %% % character %A Name of the day %B Name of the month %D mm/dd/yy %H Decimal hour on 2 digits %I Decimal hour modulo 12 on 2 digits %M Decimal minute on 2 digits %S Decimal seconds on 2 digits %T HH:MM:SS %U Decimal week number, Sunday being first day of week %W Decimal week number, Monday being first day of week %X Same as %T %Y Decimal year on 4 digits %Z Time Zone (if any) %a Abbreviated name of the day %b Abbreviated name of the month %c Appropriate date & time (default format) %d Decimal day of the month on 2 digits %e Same as %d, but a space replaces leading 0 %h Same as %b %j Decimal dey of the year on 3 digits %m Decimal month on 2 digits %n Newline character %p AM or PM %r 12-hour clock time with AM/PM %s Number of seconds since the epoch %t Tab character %w Decimal day of the week (0=Sunday) %x Same as %D %y Decimal year on 2 digits SEE ALSO
time(2), ctime(3), readclock(8). DATE(1)
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