Friday, January 11, 2008
More of "date" command
A few more about "date" command, we can use its options for many occasions :-). Here are some of them.
1) Normal dates !
Today
$ date +%Y-%m-%d
2008-01-11
After 2 day
$ date +%Y-%m-%d -d "2 day"
2008-01-13
Before 2 day
$ date +%Y-%m-%d -d "-2 day"
2008-01-09
Yesterday
$ date +%Y-%m-%d -d "yesterday"
2008-01-10
Tomorrow
$ date +%Y-%m-%d -d "next day"
2008-01-12
After 3 weeks
$ date +%Y-%m-%d -d "3 weeks"
2008-02-01
Before 3 weeks
$ date +%Y-%m-%d -d "-3 weeks"
2007-12-21
One Year 3 days after
$ date -d "1 year 3 days"
Wed Jan 14 14:10:32 IST 2009
Last Sunday what was the date ?
$ date -d 'last sun'
Sun Jan 6 00:00:00 IST 2008
How about coming Sunday?
$ date -d 'sun'
Sun Jan 13 00:00:00 IST 2008
This year, what day does "Independence Day" fall on?
$ date --date='15 Aug' +%A
Friday
2) GMT Time?
$ date -u
Fri Jan 11 08:44:27 UTC 2008
3) Epoch time?
Number of seconds from 1970-01-01 UTC (epoch time,it is the number of seconds elapsed since midnight UTC of January 1, 1970, not counting leap seconds)
$ date +%s
1199968580
The opposite way conversion, from epoch time to date
$ date --date '1970-01-01 UTC 1199968580 seconds'
Thu Jan 10 18:06:20 IST 2008
Make a function in ~/.bash_profile
epochtime () {
date --date '1970-01-01 UTC '$1' seconds'
}
So that
$ epochtime 1199968580
Thu Jan 10 18:06:20 IST 2008
Perl/Python alternatives:
$ python
Python 2.3.5 (#2, Oct 16 2006, 19:19:48)
[GCC 3.3.5 (Debian 1:3.3.5-13)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import time
>>> time.ctime(1199968580)
'Thu Jan 10 18:06:20 2008'
>>>
$ perl -e "print scalar(localtime(1199968580))"
Thu Jan 10 18:06:20 2008
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2 comments:
Ha Ha Ha !!! It is as if we are writing 'literally' in prompt. '1 day', '2 days', 'next week'.....nice really :)
thanks for the post .We have ec2 (Amazon)servers which shows time in UTC zone.If I want to see indian time and date what parameter , I have to give with date command line.Thanks in advance.
Regards
Krushna
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