Customize Date Output Format in Bash Command Line

This article introduces methods to customize the date output format in the Bash command line and format it to commonly used ISO standard-compliant formats. For example, below we output an ISO8601 timestamp with date in Bash.

date +%FT%T%Z

Other useful formats

ISO8601 .. date --utc +%FT%TZ         
ISO8601 .. date --utc +%FT%T.%3NZ 
ISO8601 .. date +%FT%T%Z          

Most common Bash date commands for timestamping « The Intellectual Wilderness