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Questions[date](ubuntu)

Martin Hope
ICE
Asked: 2019-03-23 05:20:14 +0800 CST
  • 8

I want to get the date information with this command:

date --date=2019-03-22

or 

date --date=2019/03/22

but it shows this error:

date: invalid date ‘2019-03-22’

or

 date: invalid date ‘2019/03/22’

as you can see it is not related to dash. the same thing happens with slash.

When I use another date like 

date --date=2019-03-21

It shows the information correctly.

It shouldn't be related to the bad dash character. because I just deleted the last 2 and replaced it with 1 and the output is OK.

What is going wrong?

Result of some commands for more information:

$ date --version
date (GNU coreutils) 8.28
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by David MacKenzie.

$ type -a date
date is /bin/date

$ uname -m
x86_64

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.2 LTS
Release:    18.04
Codename:   bionic

$ which date
/bin/date

$ apt-cache policy coreutils
coreutils:
  Installed: 8.28-1ubuntu1
  Candidate: 8.28-1ubuntu1
  Version table:
 *** 8.28-1ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

$ date
Fri Mar 22 06:54:59 PDT 2019

date --date=2019-03-22 2>&1 | od -c
0000000   d   a   t   e   :       i   n   v   a   l   i   d       d   a
0000020   t   e     342 200 230   2   0   1   9   -   0   3   -   2   2
0000040 342 200 231  \n
0000044

Something weird going on with different timezone in this date: 2019-03-22. I randomly changed timezone to different areas. Some of them have errors, some of them not! When I select these I have problem with that specific date:

  • Los Angeles (USA)
  • Shanghai (China)
  • Madrid (Spain)
command-line date
Martin Hope
strader
Asked: 2018-05-15 01:35:03 +0800 CST
  • 28

Since the update to 18.04 from 16.04, i see top bar with date and time only on the primary screen of my notebook. On the other screens the top bar is not shown.

Another anoying thing is i see only the actual weekday and time of the day. I would like to see the whole date with time without clicking on it...

I've searched along by google but i didnt found a solution...

date ubuntu-gnome 18.04 top-bar
Martin Hope
Bulrush
Asked: 2014-12-25 04:14:58 +0800 CST
  • 20

I'd like to have a time, say 6:45am, and add an amount of hours, say 1.45 hours, to result in another time. So I'd like to add 1.45 hours to 6:45am to get another time.

Is there a command line utile for that? I've done some Googling, and read the man page for date and haven't found anything like that. wcalc doesn't seem to handle time calculations.

EDIT: Mar 6, 2015. This is the script I ended up with to use decimal hours. It could use some error checking to make sure HH:MM uses 2 digits for the hours.

#!/bin/bash
# Mar 6, 2015
# Add decimal hours to given time. 
# Syntax: timeadd HH:MM HOURS
# There MUST be 2 digits for the hours in HH:MM.
# Times must be in military time. 
# Ex: timeadd 05:51 4.51
# Ex: timeadd 14:12 2.05
echo " "
# If we have less than 2 parameters, show instructions and exit.
if [ $# -lt 2 ]
then
    echo "Usage: timeadd HH:MM DECHOURS"
    exit 1
fi
intime=$1
inhours=$2
# Below is arithmetic expansion $(())
# The bc calculator is standard on Ubuntu. 
# Below rounds to the minute. 
inminutes=$(echo "scale=0; ((($inhours * 60)*10)+5)/10" | bc)
echo "inminutes=$inminutes"
now=$(date -d "$intime today + $inminutes minutes" +'%H:%M')
echo "New time is $now"
date
Martin Hope
krax
Asked: 2013-08-10 06:39:35 +0800 CST
  • 7

I have a dual boot system with Win 7 / Ubuntu 13.04. For some reason, Ubuntu resets the system time to -3 hours regardless of timezone settings. I thought that this was UTC problem, but the problem persists regardless of what is set in /etc/default/rcS.

# assume that the BIOS clock is set to UTC time (recommended)
UTC=no

If I check the timezone with date +%Z it states

UTC

However, when using the graphical user interface to check the timezone it shows that I'm in the right timezone.

Date gives me

pe 9.8.2013 13.51.52 +0000

While hwclock is the correct time

pe  9. elokuuta 2013 16.52.03  -0.516733 sekuntia

Ubuntu seems to set the BIOS time to wrong time. This happens on every boot, even after I've manually changed the time. Windows 7 does not have this problem. I could not find duplicates or solutions beyond the UTC settings.

The system is set to manual time and is not updating it from the internet. I've already tried that but it seems that it never updates so I'm stuck in the wrong time.

date