https://zxq9.com/archives/795

gistfile1.txt

#! /bin/bash

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\(%A\))
YYYY-MM-DDThh:mm:ss+hhmm        | date +%Y-%m-%dT%H:%M:%S%z     | $(date +%Y-%m-%dT%H:%M:%S%z)
YYYY-MM-DDThh:mm:ssZZZ          | date +%Y-%m-%dT%H:%M:%S%Z     | $(date +%Y-%m-%dT%H:%M:%S%Z)
EOD

gistfile2.txt

        Format/result           |       Command                 |       Output
--------------------------------+-------------------------------+------------------------------
YYYY-MM-DD_hh:mm:ss             | date +%F_%T                   | 2020-06-02_17:09:10
YYYYMMDD_hhmmss                 | date +%Y%m%d_%H%M%S           | 20200602_170910
YYYYMMDD_hhmmss (UTC version)   | date --utc +%Y%m%d_%H%M%SZ    | 20200602_090910Z
YYYYMMDD_hhmmss (with local TZ) | date +%Y%m%d_%H%M%S%Z         | 20200602_170910CST
YYYYMMSShhmmss                  | date +%Y%m%d%H%M%S            | 20200602170910
YYYYMMSShhmmssnnnnnnnnn         | date +%Y%m%d%H%M%S%N          | 20200602170910404044333
YYMMDD_hhmmss                   | date +%y%m%d_%H%M%S           | 200602_170910
Seconds since UNIX epoch:       | date +%s                      | 1591088950
Nanoseconds only:               | date +%N                      | 406778242
Nanoseconds since UNIX epoch:   | date +%s%N                    | 1591088950407675015
ISO8601 UTC timestamp           | date --utc +%FT%TZ            | 2020-06-02T09:09:10Z
ISO8601 UTC timestamp + ms      | date --utc +%FT%T.%3NZ        | 2020-06-02T09:09:10.409Z
ISO8601 Local TZ timestamp      | date +%FT%T%Z                 | 2020-06-02T17:09:10CST
YYYY-MM-DD (Short day)          | date +%F\(%a\)                | 2020-06-02(Tue)
YYYY-MM-DD (Long day)           | date +%F\(%A\)                | 2020-06-02(Tuesday)
YYYY-MM-DDThh:mm:ss+hhmm        | date +%Y-%m-%dT%H:%M:%S%z     | 2020-06-02T17:09:10+0800
YYYY-MM-DDThh:mm:ssZZZ          | date +%Y-%m-%dT%H:%M:%S%Z     | 2020-06-02T17:09:10CST