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ISO Date

ISO date uses year - month - day.
The nice thing about this is, that you easily grep it. Making lists of files from a particular date. Correlating different files;

~$: ll *.html
 4 -rw-r--r-- 1 rob rob   961 2023-04-14 11:19 404.html
 4 -rw-r--r-- 1 rob rob   789 2022-08-16 11:56 bot.html
 8 -rw-r--r-- 1 rob rob  6256 2023-10-11 12:07 index.html
 4 -rw-r--r-- 1 rob rob  1851 2022-08-19 13:44 leiden.html
 4 -rw-r--r-- 1 rob rob  1075 2022-08-19 13:44 privacy.html
 8 -rw-r--r-- 1 rob rob  4455 2023-05-06 12:44 qr.html
96 -rw-r--r-- 1 rob rob 94953 2024-02-01 09:42 sitemap.html
 4 -rw-r--r-- 1 rob rob  1064 2023-12-27 06:47 smtp-fw.html
 8 -rw-r--r-- 1 rob rob  7477 2023-12-12 15:01 system.html
~$: ll *.html | grep 2024
96 -rw-r--r-- 1 rob rob 94953 2024-02-01 09:42 sitemap.html

This document describes how to enable ISO date.

Versions

Date and time may be separated by a space or a capital latter 'T';

YYYY-mm-dd HH:MM:SS
YYYY-mm-ddTHH:MM:SS

These may come with optional milliseconds or microseconds and a time zone.

YYYY-mm-dd HH:MM:SS ┬▒zzzz

A syslog example;

2024-02-01T11:11:05.410158+01:00

Analog

In /etc/analog.cfg;

Time stampConfig
2024-02-01T11:11:05.410158+01:00 %Y-%m-%dT%h:%n:%j
[2024-02-01 11:14:55 +0100] [%Y-%m-%d %h:%n:%j%w%j]
2024-02-01T11:16:05.820 %Y-%m-%dT%h:%n:%j
2024-02-01 10:56:49 %Y-%m-%d %h:%n:%j
2024-02-01 11:05:14.345 +0100 %Y-%m-%d %h:%n:%j%w%j

Apache

[2024-02-01 11:14:55 +0100]

In '/etc/apache2/apache2.conf';

LogFormat "%v:%p %h %l %u %{[%Y-%m-%d %H:%M:%S %z]}t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
LogFormat "%h %l %u %{[%Y-%m-%d %H:%M:%S %z]}t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %{[%Y-%m-%d %H:%M:%S %z]}t \"%r\" %>s %O" common

Bind

2024-02-01T11:16:05.820

In the logging section;

print-time iso8601;

LS

In '~/.bashrc';

alias ll='ls -als --time-style=long-iso'

Squid

2024-02-01 11:05:14.345 +0100

In '/etc/squid/squid.conf';

logformat isodate %{%F %T}tl.%03tu %{%z}tl %6tr %>A %Ss/%03>Hs %<st %rm %ru %[un %Sh/%<a %mt
access_log daemon:/var/log/squid/access.log isodate