Useful Bash Date Formats

bash_date_formats.sh

#! /bin/bash

# An overly obvious reference for most commonly requested bash timestamps
# Now all you Mac fags can stop pestering me.

cat << EOD
        Format/result           |       Command              |          Output
--------------------------------+----------------------------+------------------------------
YYYY-MM-DD_hh:mm:ss             | date +%F_%T                | $(date +%F_%T)
YYYYMMDD_hhmmss                 | date +%Y%m%d_%H%M%S        | $(date +%Y%m%d_%H%M%S)
YYYYMMDD_hhmmss (UTC version)   | date --utc +%Y%m%d_%H%M%SZ | $(date --utc +%Y%m%d_%H%M%SZ)
YYYYMMDD_hhmmss (with local TZ) | date +%Y%m%d_%H%M%S%Z      | $(date +%Y%m%d_%H%M%S%Z)
YYYYMMSShhmmss                  | date +%Y%m%d%H%M%S         | $(date +%Y%m%d%H%M%S)
YYYYMMSShhmmssnnnnnnnnn         | date +%Y%m%d%H%M%S%N       | $(date +%Y%m%d%H%M%S%N)
YYMMDD_hhmmss                   | date +%y%m%d_%H%M%S        | $(date +%y%m%d_%H%M%S)
Seconds since UNIX epoch:       | date +%s                   | $(date +%s)
Nanoseconds only:               | date +%N                   | $(date +%N)
Nanoseconds since UNIX epoch:   | date +%s%N                 | $(date +%s%N)
ISO8601 UTC timestamp           | date --utc +%FT%TZ         | $(date --utc +%FT%TZ)
ISO8601 UTC timestamp + ms      | date --utc +%FT%T.%3NZ     | $(date --utc +%FT%T.%3NZ)
ISO8601 Local TZ timestamp      | date +%FT%T%Z              | $(date +%FT%T%Z)
YYYY-MM-DD (Short day)          | date +%F\(%a\)             | $(date +%F\(%a\))
YYYY-MM-DD (Long day)           | date +%F\(%A\)             | $(date +%F\(%A\))
EOD




        Format/result           |       Command              |          Output
--------------------------------+----------------------------+------------------------------
YYYY-MM-DD_hh:mm:ss             | date +%F_%T                | 2018-01-24_13:06:51
YYYYMMDD_hhmmss                 | date +%Y%m%d_%H%M%S        | 20180124_130651
YYYYMMDD_hhmmss (UTC version)   | date --utc +%Y%m%d_%H%M%SZ | 20180124_040651Z
YYYYMMDD_hhmmss (with local TZ) | date +%Y%m%d_%H%M%S%Z      | 20180124_130651JST
YYYYMMSShhmmss                  | date +%Y%m%d%H%M%S         | 20180124130651
YYYYMMSShhmmssnnnnnnnnn         | date +%Y%m%d%H%M%S%N       | 20180124130651170243401
YYMMDD_hhmmss                   | date +%y%m%d_%H%M%S        | 180124_130651
Seconds since UNIX epoch:       | date +%s                   | 1516766811
Nanoseconds only:               | date +%N                   | 174236092
Nanoseconds since UNIX epoch:   | date +%s%N                 | 1516766811175655627
ISO8601 UTC timestamp           | date --utc +%FT%TZ         | 2018-01-24T04:06:51Z
ISO8601 UTC timestamp + ms      | date --utc +%FT%T.%3NZ     | 2018-01-24T04:06:51.178Z
ISO8601 Local TZ timestamp      | date +%FT%T%Z              | 2018-01-24T13:06:51JST
YYYY-MM-DD (Short day)          | date +%F\(%a\)             | 2018-01-24(水)
YYYY-MM-DD (Long day)           | date +%F\(%A\)             | 2018-01-24(水曜日)
YYYY-MM-DD (Short day)          | date +%F\(%a\)             | 2018-01-24(Wed)
YYYY-MM-DD (Long day)           | date +%F\(%A\)             | 2018-01-24(Wednesday)