How to get date of tomorrow in console?

[cro.smiley]

Is there a way to get tomorrow date in console, using "date" command or something else?

I need that so i can put new date in /proc/acpi/alarm to wake my computer every day at 7:00.

Date should be in format: yyyy-mm-dd
Thank you.

[sphinx]

I was about to suggest obtaining the day field seperately and incrementing it yourself in the bash script, like this $((`date +%d`+1)) but then I realised that wouldn't work if today was the last day of the month. Otherwise you might end up with a date of 2006-03-32.

You could program around this problem but I'm sure someone somewhere has already solved this problem in one language or another. As I only really know Java I'll list the code to do it in that, but I'm sure other languages has this abillity too. I realise this code is useless to you if you dont have java installed and if this is the case then hopefully someone else will reply with another solution.



import java.util.Calendar;
import java.text.SimpleDateFormat;

public class PrintTomorrow {
public static void main(String[] args) {
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(System.currentTimeMillis());
cal.add(Calendar.DAY_OF_MONTH,1);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
System.out.print(sdf.format(cal.getTime()));
}
}

[Moobert]

or in python which comes preinstalled


#!/usr/bin/env python

import time
import datetime

day = (24*60)*60
tomorrow = datetime.datetime.fromtimestamp(time.time() + day)
print tomorrow.strftime("%Y-%m-%d")

your just need to put it in a text file (ending in .py), then
chmod +x <file name>the file, then run it from the terminal, with a
./<file name> As for alarms i'd look into crontab:

http://www.adminschoice.com/docs/crontab.htm

[wmcbrine]

I found out a while back that "date" is a remarkably powerful and flexible command. Check it out:

date -d tomorrow

However, I agree that this really sounds like a job for cron.

[sphinx]

date -d tomorrow


Bah! Foiled by a ridiculously simple command line argument yet again!

[thumper]

If we ignore the date command and go back to python...


#!/usr/bin/env python
# don't need time module
from datetime import datetime, timedelta
tomorrow = datetime.today() + timedelta(1)
# default string representation is extended ISO
date_str = str(tomorrow)[:10]
print date_str

:)

[cro.smiley]

Thank you all for help. I think I'll use python to solve this.

btw I think I can't use cron for this cause I need to wake my computer from suspend to RAM, and I can do it only by putting date and time in /proc/acpi/alarm file.
So if I need to wake it up every day I need to refresh file with the date of tomorrow every day.

But nevermind, you all helped a lot.

[thumper]

You could run a cron job everyday that updates the contents of the alarm file to be tomorrows date. No reason why that would be a problem.