date format

monu · 10-07-2007, 10:29 PM

Hi,

I am having problem with creatng date formate: YYYYMMDD .

My code is: date +%Y%m%d but its not working it. I checked %Y only displays current year not past year. suppose if i enter my date: 18240804 it doesn't accept it. IT only takes 20070804.. not past years. What is date -s do?

Thanks

monu · 10-07-2007, 10:49 PM

for example:

#!/bin/bash

c_date=`date +%Y`

read -p echo "enter year" year

if......
echo "working"
else

echo "not working"

fi

enter year:2005
not working
enter year: 2007

working!

So my point is %Y is only for current year not for past year. I want to create script which accepts past years day and months like this: YYYMMDD. I read man page i couldn't find out what is date -s ? please provide me some example and with past year.

Thanks

chrism01 · 10-08-2007, 02:20 AM

From the man page:
date - print or set the system date and time
I don't think it does what you want ie check random strings for validate dates (if that's what you meant).

colucix · 10-08-2007, 03:32 AM

The GNU date command accept the -d option to specify a date other than the current date. From the info page:

Quote:

`-d DATESTR'
`--date=DATESTR'
Display the date and time specified in DATESTR instead of the
current date and time. DATESTR can be in almost any common
format. It can contain month names, time zones, `am' and `pm',
`yesterday', etc. For example, `--date="2004-02-27
14:19:13.489392193 +0530"' specifies the instant of time that is
489,392,193 nanoseconds after February 27, 2004 at 2:19:13 PM in a
time zone that is 5 hours and 30 minutes east of UTC. *Note Date
input formats::.

Check the section "Note Date input formats" for details on how to specify the past date. The following are all working examples:

Code:

date -d "23 June 1867" +%Y%m%d
date -d "Jul 11, 1968 - 3 days" +%Y%m%d
date -d "2 days ago" +%Y%m%d

and so on.

Tinkster · 10-08-2007, 04:48 AM

I'm afraid that date won't handle dates before 1902

Code:

$ date -d 1902-04-08
Tue Apr  8 00:00:00 GMT 1902

$ date -d 1901-04-08
date: invalid date `1901-04-08'

Not that I can see any useful application to that,
mind you....

Cheers,
Tink

colucix · 10-08-2007, 05:26 AM

Quote:

Originally Posted by Tinkster

I'm afraid that date won't handle dates before 1902

Uh... mine seems to work...

Code:

$ date -d 1902-04-08
Tue Apr  8 00:00:00 CET 1902

$ date -d 1901-04-08
Mon Apr  8 00:00:00 CET 1901

I have date version:

Code:

date (GNU coreutils) 5.97

I will investigate!

Cheers

monu · 10-08-2007, 11:47 AM

Thanks

I will try that