Merge branch 'master' into develop
[BK-2020-03.git] / unitproc / bktemp-dateShort
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fc1495ab 1#!/bin/bash
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2# Desc: Template to display date
3
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4yell() { echo "$0: $*" >&2; } #o Yell, Die, Try Three-Fingered Claw technique
5die() { yell "$*"; exit 111; } #o Ref/Attrib: https://stackoverflow.com/a/25515370
6try() { "$@" || die "cannot $*"; } #o
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7dateShort(){
8 # Desc: Date without separators (YYYYmmdd)
ea368c74 9 # Usage: dateShort ([str date])
ee519cfd 10 # Version: 1.1.2
ea368c74 11 # Input: arg1: 'date'-parsable timestamp string (optional)
fc1495ab 12 # Output: stdout: date (ISO-8601, no separators)
ee519cfd 13 # Depends: bash 5.0.3, date 8.30, yell()
26961aa3 14 local argTime timeCurrent timeInput dateCurrentShort
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15
16 argTime="$1";
17 # Get Current Time
26961aa3 18 timeCurrent="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
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19 # Decide to parse current or supplied date
20 ## Check if time argument empty
21 if [[ -z "$argTime" ]]; then
22 ## T: Time argument empty, use current time
26961aa3 23 timeInput="$timeCurrent";
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24 else
25 ## F: Time argument exists, validate time
26 if date --date="$argTime" 1>/dev/null 2>&1; then
27 ### T: Time argument is valid; use it
26961aa3 28 timeInput="$argTime";
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29 else
30 ### F: Time argument not valid; exit
31 yell "ERROR:Invalid time argument supplied. Exiting."; exit 1;
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32 fi;
33 fi;
ea368c74 34 # Construct and deliver separator-les date string
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35 dateCurrentShort="$(date -d "$timeInput" +%Y%m%d)"; # Produce separator-less current date with resolution 1 day.
36 echo "$dateCurrentShort";
50aec114 37} # Get YYYYmmdd
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38
39#==BEGIN sample code==
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40echo "The current day is :$(dateShort)";
41echo "Contact lost with STS-107 on:$(dateShort "2003-02-01T08:59:15-05:00")";
42echo "Bitcoin started on :$(dateShort "@1231006505")";
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43#==END sample code==
44
45# Author: Steven Baltakatei Sandoval
46# License: GPLv3+