Converting Epoch time

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# 1  
Old 01-02-2014
Converting Epoch time

I have a Raspberry Pi that logs some temperatures using Onewire. Data is collected with RRDTool.
The command
sudo rrdtool fetch ute_temp.rrd AVERAGE -s -1h > ./test.log

and then
cat test.log

gives the result
1388608500: 2.3579639836e+00


How do I write a script that converts the Epoch time stamps to normal readable time and printing the result on a new file?

I plan to use the logfile in Excel to analyze my data. (Have not found any tools in Excel to convert Epoch time to human time.

Thanks for any help.

# 2  
Old 01-02-2014
Epoch time conversion should be handled on the system where you are recording time. You can use awk (gawk) or perl. Check your level of awk on your system for mktime() systime(),strftime(). See



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# 3  
Old 01-03-2014
I was given this a while back. It relys on Perl, but it works for me on HP-UX and AIX:-
$ cat realtime
perl -e 'print scalar localtime $ARGV[0],"\n" ' $1

$ ./realtime 1234567890
Fri Feb 13 23:31:30 2009

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# 4  
Old 01-03-2014
With ksh93 you can write
printf "%(%Y-%m-%d %T)T\n" '#'1388745871

Make sure, that you use the printf-builtin, which should be the default.
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# 5  
Old 01-03-2014
I added a function to my .profile and use it all the time:
HTML Code:
function lt {
perl -we "print scalar localtime $1"
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