Unix/Linux command to get the future time for the any given time value
I have used the below commands to find the 30 mins older time but not able to frame commands to add 30 mins.
Sample structure of input.
dateinput=20181214202959
inputTime=$(echo $dateinput | sed 's,(.{4})(.{2})(.{2})(.{2})(.{2}),1-2-3 4:5:,')
param2=`date '+%Y%m%d%H%M%S' --date="$inputTime 30 minutes ago"`
echo $param2
20181214195959
Please let me know the steps to add 30 mins similar to the above one. For the sample dateinput given above the desired output is 20181214205959.
With the direct date command I am able to add and reduce based on the requirement like given below :
$date
Tue Dec 18 20:49:06 PST 2018
$date --date "-30 minutes"
Tue Dec 18 20:18:55 PST 2018
$date --date "+30 minutes"
Tue Dec 18 21:19:01 PST 2018
But my requirement is to get the date from the input which will be given like 20181214202959 which is in YYYYMMDDhhmmss format. This is where I am facing issues. Able to reduce the time using "30 minutes ago" command but not able to get the future value for the given time.
linux date
asked Dec 19 '18 at 4:58
Sekar Ramu
54
add a comment |
I have used the below commands to find the 30 mins older time but not able to frame commands to add 30 mins.
Sample structure of input.
dateinput=20181214202959
inputTime=$(echo $dateinput | sed 's,(.{4})(.{2})(.{2})(.{2})(.{2}),1-2-3 4:5:,')
param2=`date '+%Y%m%d%H%M%S' --date="$inputTime 30 minutes ago"`
echo $param2
20181214195959
Please let me know the steps to add 30 mins similar to the above one. For the sample dateinput given above the desired output is 20181214205959.
With the direct date command I am able to add and reduce based on the requirement like given below :
$date
Tue Dec 18 20:49:06 PST 2018
$date --date "-30 minutes"
Tue Dec 18 20:18:55 PST 2018
$date --date "+30 minutes"
Tue Dec 18 21:19:01 PST 2018
But my requirement is to get the date from the input which will be given like 20181214202959 which is in YYYYMMDDhhmmss format. This is where I am facing issues. Able to reduce the time using "30 minutes ago" command but not able to get the future value for the given time.
linux date
asked Dec 19 '18 at 4:58
Sekar Ramu
54
add a comment |
I have used the below commands to find the 30 mins older time but not able to frame commands to add 30 mins.
Sample structure of input.
dateinput=20181214202959
inputTime=$(echo $dateinput | sed 's,(.{4})(.{2})(.{2})(.{2})(.{2}),1-2-3 4:5:,')
param2=`date '+%Y%m%d%H%M%S' --date="$inputTime 30 minutes ago"`
echo $param2
20181214195959
Please let me know the steps to add 30 mins similar to the above one. For the sample dateinput given above the desired output is 20181214205959.
With the direct date command I am able to add and reduce based on the requirement like given below :
$date
Tue Dec 18 20:49:06 PST 2018
$date --date "-30 minutes"
Tue Dec 18 20:18:55 PST 2018
$date --date "+30 minutes"
Tue Dec 18 21:19:01 PST 2018
But my requirement is to get the date from the input which will be given like 20181214202959 which is in YYYYMMDDhhmmss format. This is where I am facing issues. Able to reduce the time using "30 minutes ago" command but not able to get the future value for the given time.
linux date
asked Dec 19 '18 at 4:58
Sekar Ramu
54
I have used the below commands to find the 30 mins older time but not able to frame commands to add 30 mins.
Sample structure of input.
dateinput=20181214202959
inputTime=$(echo $dateinput | sed 's,(.{4})(.{2})(.{2})(.{2})(.{2}),1-2-3 4:5:,')
param2=`date '+%Y%m%d%H%M%S' --date="$inputTime 30 minutes ago"`
echo $param2
20181214195959
Please let me know the steps to add 30 mins similar to the above one. For the sample dateinput given above the desired output is 20181214205959.
With the direct date command I am able to add and reduce based on the requirement like given below :
$date
Tue Dec 18 20:49:06 PST 2018
$date --date "-30 minutes"
Tue Dec 18 20:18:55 PST 2018
$date --date "+30 minutes"
Tue Dec 18 21:19:01 PST 2018
But my requirement is to get the date from the input which will be given like 20181214202959 which is in YYYYMMDDhhmmss format. This is where I am facing issues. Able to reduce the time using "30 minutes ago" command but not able to get the future value for the given time.
linux date
linux date
asked Dec 19 '18 at 4:58
Sekar Ramu
54
asked Dec 19 '18 at 4:58
Sekar Ramu
54
asked Dec 19 '18 at 4:58
Sekar Ramu
54
asked Dec 19 '18 at 4:58
Sekar Ramu
54
asked Dec 19 '18 at 4:58
Sekar Ramu
54
54
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Your code
dateinput=20181214202959
inputTime=$(echo $dateinput | sed 's,(.{4})(.{2})(.{2})(.{2})(.{2}),1-2-3 4:5:,')
adds spacing to dateinput to set inputTime to 2018-12-14 20:59:39.
You then are running date --date="2018-12-14 20:59:59 30 minutes ago" asking for a particular output format.
If you remove the ago from the request you will ask for the time 30 minutes in the future. The effect of the word ago is to negate the most recent time offset. In general you can list a number of time offsets and these are all added, so you can combine for example a number of minutes and a number of weeks.
$ date --date="2018-12-14 20:00:00 30 minutes ago 1 week"
Fri Dec 21 19:30:00 PST 2018
$ date --date="2018-12-14 20:00:00 30 minutes 1 week"
Fri Dec 21 20:30:00 PST 2018
$ date --date="2018-12-14 20:00:00 30 minutes 1 week ago"
Fri Dec 7 20:30:00 PST 2018
answered Dec 19 '18 at 5:32
icarus
5,6611929
Thanks buddy, tried hell lot of things but missed to try this :)
– Sekar Ramu
Dec 19 '18 at 6:01
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Your code
dateinput=20181214202959
inputTime=$(echo $dateinput | sed 's,(.{4})(.{2})(.{2})(.{2})(.{2}),1-2-3 4:5:,')
adds spacing to dateinput to set inputTime to 2018-12-14 20:59:39.
You then are running date --date="2018-12-14 20:59:59 30 minutes ago" asking for a particular output format.
If you remove the ago from the request you will ask for the time 30 minutes in the future. The effect of the word ago is to negate the most recent time offset. In general you can list a number of time offsets and these are all added, so you can combine for example a number of minutes and a number of weeks.
$ date --date="2018-12-14 20:00:00 30 minutes ago 1 week"
Fri Dec 21 19:30:00 PST 2018
$ date --date="2018-12-14 20:00:00 30 minutes 1 week"
Fri Dec 21 20:30:00 PST 2018
$ date --date="2018-12-14 20:00:00 30 minutes 1 week ago"
Fri Dec 7 20:30:00 PST 2018
answered Dec 19 '18 at 5:32
icarus
5,6611929
Thanks buddy, tried hell lot of things but missed to try this :)
– Sekar Ramu
Dec 19 '18 at 6:01
add a comment |
Your code
dateinput=20181214202959
inputTime=$(echo $dateinput | sed 's,(.{4})(.{2})(.{2})(.{2})(.{2}),1-2-3 4:5:,')
adds spacing to dateinput to set inputTime to 2018-12-14 20:59:39.
You then are running date --date="2018-12-14 20:59:59 30 minutes ago" asking for a particular output format.
If you remove the ago from the request you will ask for the time 30 minutes in the future. The effect of the word ago is to negate the most recent time offset. In general you can list a number of time offsets and these are all added, so you can combine for example a number of minutes and a number of weeks.
$ date --date="2018-12-14 20:00:00 30 minutes ago 1 week"
Fri Dec 21 19:30:00 PST 2018
$ date --date="2018-12-14 20:00:00 30 minutes 1 week"
Fri Dec 21 20:30:00 PST 2018
$ date --date="2018-12-14 20:00:00 30 minutes 1 week ago"
Fri Dec 7 20:30:00 PST 2018
answered Dec 19 '18 at 5:32
icarus
5,6611929
Thanks buddy, tried hell lot of things but missed to try this :)
– Sekar Ramu
Dec 19 '18 at 6:01
add a comment |
Your code
dateinput=20181214202959
inputTime=$(echo $dateinput | sed 's,(.{4})(.{2})(.{2})(.{2})(.{2}),1-2-3 4:5:,')
adds spacing to dateinput to set inputTime to 2018-12-14 20:59:39.
You then are running date --date="2018-12-14 20:59:59 30 minutes ago" asking for a particular output format.
If you remove the ago from the request you will ask for the time 30 minutes in the future. The effect of the word ago is to negate the most recent time offset. In general you can list a number of time offsets and these are all added, so you can combine for example a number of minutes and a number of weeks.
$ date --date="2018-12-14 20:00:00 30 minutes ago 1 week"
Fri Dec 21 19:30:00 PST 2018
$ date --date="2018-12-14 20:00:00 30 minutes 1 week"
Fri Dec 21 20:30:00 PST 2018
$ date --date="2018-12-14 20:00:00 30 minutes 1 week ago"
Fri Dec 7 20:30:00 PST 2018
answered Dec 19 '18 at 5:32
icarus
5,6611929
Your code
dateinput=20181214202959
inputTime=$(echo $dateinput | sed 's,(.{4})(.{2})(.{2})(.{2})(.{2}),1-2-3 4:5:,')
adds spacing to dateinput to set inputTime to 2018-12-14 20:59:39.
You then are running date --date="2018-12-14 20:59:59 30 minutes ago" asking for a particular output format.
If you remove the ago from the request you will ask for the time 30 minutes in the future. The effect of the word ago is to negate the most recent time offset. In general you can list a number of time offsets and these are all added, so you can combine for example a number of minutes and a number of weeks.
$ date --date="2018-12-14 20:00:00 30 minutes ago 1 week"
Fri Dec 21 19:30:00 PST 2018
$ date --date="2018-12-14 20:00:00 30 minutes 1 week"
Fri Dec 21 20:30:00 PST 2018
$ date --date="2018-12-14 20:00:00 30 minutes 1 week ago"
Fri Dec 7 20:30:00 PST 2018
answered Dec 19 '18 at 5:32
icarus
5,6611929
answered Dec 19 '18 at 5:32
icarus
5,6611929
answered Dec 19 '18 at 5:32
icarus
5,6611929
answered Dec 19 '18 at 5:32
icarus
5,6611929
5,6611929
Thanks buddy, tried hell lot of things but missed to try this :)
– Sekar Ramu
Dec 19 '18 at 6:01
add a comment |
Thanks buddy, tried hell lot of things but missed to try this :)
– Sekar Ramu
Dec 19 '18 at 6:01
Thanks buddy, tried hell lot of things but missed to try this :)
– Sekar Ramu
Dec 19 '18 at 6:01
Thanks buddy, tried hell lot of things but missed to try this :)
– Sekar Ramu
Dec 19 '18 at 6:01
add a comment |
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