time_calculations
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Table of Contents
Epoch time calculations
Days since Epoch
echo $(date +%s)/86400 | bc echo $(($(date +%s)/86400)) let days=$(date +%s)/86400 ; echo $days
Days since Epoch without GNU date
If perl is installed:
perl -e ' $days=int(time()/86400);print "$days\n"; '
Epoch time on system without GNU date
perl -e 'print time(), "\n" '
Convert from Epoch with perl
perl -e "print scalar(localtime(1268727836))"
Find date for last password change for Linux user
Replace <username> with account in question
passwd -S <username> <username> PS 2013-02-27 7 90 7 14 (Password set, SHA512 crypt.)
date -d "1 January 1970 + $(grep <username> /etc/shadow | awk -F: '{print $3}') days"
Convert UTC date/time to local timezone
date -d '2012-08-08 16:00 UTC' Wed Aug 8 18:00:00 CEST 2012 date -d '2012-12-08 16:00 UTC' Sat Dec 8 17:00:00 CET 2012
Convert current local time to UTC
date --utc Wed Aug 8 12:35:15 UTC 2012
time_calculations.1365435460.txt.gz · Last modified: 2013/04/08 15:37 by root
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