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fc1495ab SBS |
1 | #!/bin/bash |
2 | ||
3 | # Desc: Template to display date | |
4 | ||
ea368c74 SBS |
5 | yell() { echo "$0: $*" >&2; } #o Yell, Die, Try Three-Fingered Claw technique |
6 | die() { yell "$*"; exit 111; } #o Ref/Attrib: https://stackoverflow.com/a/25515370 | |
7 | try() { "$@" || die "cannot $*"; } #o | |
fc1495ab SBS |
8 | dateShort(){ |
9 | # Desc: Date without separators (YYYYmmdd) | |
ea368c74 SBS |
10 | # Usage: dateShort ([str date]) |
11 | # Version: 1.1.0 | |
12 | # Input: arg1: 'date'-parsable timestamp string (optional) | |
fc1495ab | 13 | # Output: stdout: date (ISO-8601, no separators) |
ea368c74 | 14 | # Depends: yell |
b03c9c0c | 15 | local TIME_CURRENT DATE_CURRENT_SHORT |
ea368c74 SBS |
16 | |
17 | argTime="$1"; | |
18 | # Get Current Time | |
fc1495ab | 19 | TIME_CURRENT="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second. |
ea368c74 SBS |
20 | # Decide to parse current or supplied date |
21 | ## Check if time argument empty | |
22 | if [[ -z "$argTime" ]]; then | |
23 | ## T: Time argument empty, use current time | |
24 | TIME_INPUT="$TIME_CURRENT"; | |
25 | else | |
26 | ## F: Time argument exists, validate time | |
27 | if date --date="$argTime" 1>/dev/null 2>&1; then | |
28 | ### T: Time argument is valid; use it | |
29 | TIME_INPUT="$argTime"; | |
30 | else | |
31 | ### F: Time argument not valid; exit | |
32 | yell "ERROR:Invalid time argument supplied. Exiting."; exit 1; | |
33 | fi | |
34 | fi | |
35 | # Construct and deliver separator-les date string | |
36 | DATE_CURRENT_SHORT="$(date -d "$TIME_INPUT" +%Y%m%d)"; # Produce separator-less current date with resolution 1 day. | |
fc1495ab | 37 | echo "$DATE_CURRENT_SHORT"; |
50aec114 | 38 | } # Get YYYYmmdd |
fc1495ab SBS |
39 | |
40 | #==BEGIN sample code== | |
ea368c74 SBS |
41 | echo "The current day is :$(dateShort)"; |
42 | echo "Contact lost with STS-107 on:$(dateShort "2003-02-01T08:59:15-05:00")"; | |
43 | echo "Bitcoin started on :$(dateShort "@1231006505")"; | |
fc1495ab SBS |
44 | #==END sample code== |
45 | ||
46 | # Author: Steven Baltakatei Sandoval | |
47 | # License: GPLv3+ |