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UNIX Dates

 
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# 1  
Old 02-14-2008
UNIX Dates
Hey guys.

I need to manipulate the system date to move forward a day. So, if the system date was 02/14/08, I need the 'new' date to be 02/15/08 so my script will look for the date of 02/15/08. The thing is the file I will be looking for always has the date of the next day.

Any ideas,

Thanks
# 2  
Old 02-14-2008
No, you probably don't want to set the system time to any arbitrary value. Even with your own desktop, it may cause problems you will not anticipate.


From what I gather from what you said, all you need to do is use touch -t <file>:
Code:
# assuming tomorrow is feb 15 2008 at 1200

# if myfile doesn't exist touch wil create an empty file for you
touch -t 200802151200 myfile

Now the file has tomoorow's date.
# 3  
Old 02-14-2008
In ksh or bash

Current time:
XXX$ date
Thu Feb 14 19:20:44 CET 2008

Same time tomorrow:
XXX$ ZONE=`date +%Z`
XXX$ TZOFFSET=`date +%z| sed -e "s/..$//"`
XXX$ ((DAYAHEAD=$TZOFFSET+24))
XXX$ TZ=$ZONE-$DAYAHEAD date
Fri Feb 15 19:20:44 CET 2008
# 4  
Old 02-14-2008
You can set an enviroment variable for tomorrow's date and then use
that for your check.

Code:
date +%Y%m%d
20080214

TOMORROW=`TZ=aaa-24 date +%Y%m%d`

echo $TOMORROW
20080215

# 5  
Old 02-14-2008
thanks den for your help. Simple solution.

One more thing though, I need a way to find out what day of the week a certain date is.

For example, if the date returned by what den posted, 20080215, the day of week would be '5'.

Does anybody know a way to find this information?

Thanks again, appreciate your help
# 6  
Old 02-14-2008
date +%u

gives the day of the week as a number
# 7  
Old 02-14-2008
Quote:
Originally Posted by denn
You can set an enviroment variable for tomorrow's date and then use
that for your check.

Code:
date +%Y%m%d
20080214

TOMORROW=`TZ=aaa-24 date +%Y%m%d`

echo $TOMORROW
20080215

This works fine if you are not interested in hours and minutes, because it neglects your offset to UTC. It will also specify the timezone as aaa.

To maintain all information, and just go 1 day ahead, the example as I posted is correct.
 
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