feat(user/bkdatev):Substitute UNIX epoch for UTC locale time
[BK-2020-03.git] / user / bkdatev
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1#!/usr/bin/env bash
2# Desc: Baltakatei's verbose date command
3# Usage: bkdatev [args]
4# Example: bkdatev --date="2001-09-11T09:02:59-04"
5# Version: 0.1.0
6# Ref/Attrib: [1] "ISO 8601". Wikipedia. https://en.wikipedia.org/wiki/ISO_8601
7# [2] "Changing the Locale in Wine" https://stackoverflow.com/a/16428951
8# [3] "Shanghai vs Beijing" https://bugs.launchpad.net/ubuntu/+source/libgweather/+bug/228554
9# Notes: * Check `ls -R /usr/share/zoneinfo` for time zone names.
10# * Check `cat /usr/share/i18n/SUPPORTED` for supported locales.
11# * For list of valid locales, see: https://manpages.ubuntu.com/manpages/bionic/man3/DateTime::Locale::Catalog.3pm.html
12# * Locations chosen for population, personal signifiance, and spatial coverage.
13# # For International Atomic Time (TAI), use offsets from UTC provided in `/usr/share/zoneinfo/leap-seconds.list`.
14
15line_sep() {
16 # Input: var: n_ln
17 local skip_every=4;
18 ((n_ln++));
19 if ! ((n_ln % "$skip_every")); then
20 printf "\n";
21 fi;
22 return 0;
23}; # periodically print separating blank line
24print_dateline() {
25 # Input: var: $id
26 # var: $fs_1
27 # var: $fs_2
28 # var: $fs_3
29 # args: $@
30 # Output: stdout
31 # Depends: printf, date
32 # Ref/Attrib: * Truncate string in printf https://stackoverflow.com/a/46812677
33 local s_1 s_2 s_3 s_4;
34
35 s_1="$id";
36 s_2="$(date "$@" "$fs_1")";
37 s_3="$(date "$@" "$fs_2")";
38 s_4="$(date "$@" "$fs_3")";
39
40 printf "%-10.10s %-25.25s (%-20.20s) (%s)" "$s_1" "$s_2" "$s_3" "$s_4";
41 printf "\n";
42
43 unset fs_1 fs_2 fs_3 fs_4;
44 }; # print line of dates
45main() {
46 n_ln=0; # for line_sep()
47
48 # format strings
49 fs_iso8601="+%Y-%m-%dT%H:%M:%S%:::z"; # typical ISO-8601
50 fs_iso8601_etc="+%G-W%V-%u, %Y-%j"; # alternate ISO-8601 dates
51 fs_locale="+%Z; %A; %c"; # locale-specific date strings
52
53 # vars for print_dateline()
54 fs_1="$fs_iso8601";
55 fs_2="$fs_iso8601_etc";
56 fs_3="$fs_locale";
57
58 # UTC (pop. (2021): 7,837,000,000)
59 (
60 export TZ=UTC;
61 id="UTC";
62 fs_3="+%s seconds since 1970-01-01T00:00+00";
63 print_dateline "$@";
64 ); line_sep;
65
66 # Hawaii
67 (
68 export TZ=US/Hawaii;
69 export LANG="haw-US.UTF8";
70 id="HAWAII";
71 print_dateline "$@";
72 ); line_sep;
73
74 # Los Angeles, USA
75 (
76 export TZ=America/Los_Angeles;
77 export LANG="en_US.UTF-8";
78 id="LOS ANGELES";
79 print_dateline "$@";
80 ); line_sep;
81
82 # Denver, USA (pop. (2021): 711,463)
83 (
84 export TZ=America/Denver;
85 export LANG="en_US.UTF-8";
86 id="DENVER";
87 print_dateline "$@";
88 ); line_sep;
89
90 # Chicago, USA (pop. (2021): 711,463)
91 (
92 export TZ=America/Chicago;
93 export LANG="en_US.UTF-8";
94 id="CHICAGO";
95 print_dateline "$@";
96 ); line_sep;
97
98 # Mexico City, Mexico (pop. (2018): 21,804,515)
99 (
100 export TZ=America/Mexico_City;
101 export LANG="es_MX.UTF8";
102 id="MEXICO CITY";
103 print_dateline "$@";
104 ); line_sep;
105
106 # Panama City, Panama
107 (
108 export TZ=America/Panama;
109 export LANG="es_PA.UTF8";
110 id="PANAMA CITY";
111 print_dateline "$@";
112 ); line_sep;
113
114 # New York, USA (pop. (2018): 20,140,470)
115 (
116 export TZ=America/New_York;
117 export LANG="en_US.UTF-8";
118 id="NEW YORK";
119 print_dateline "$@";
120 ); line_sep;
121
122 # São Paulo, Brazil
123 (
124 export TZ=America/Sao_Paulo;
125 export LANG="pt_BR.UTF8";
126 id="SAO PAULO";
127 print_dateline "$@";
128 ); line_sep;
129
130 # Buenos Aires
131 (
132 export TZ=America/Argentina/Buenos_Aires;
133 export LANG="es_AR.UTF8";
134 id="BUENOS AIRES";
135 print_dateline "$@";
136 ); line_sep;
137
138 # London, England
139 (
140 export TZ=Europe/London;
141 export LANG="en_GB.UTF-8";
142 id="LONDON";
143 print_dateline "$@";
144 ); line_sep;
145
146 # Kinshasa, Africa
147 (
148 export TZ=Africa/Kinshasa;
149 export LANG="ln_CD.UTF8";
150 id="KINSHASA";
151 print_dateline "$@";
152 ); line_sep;
153
154 # Lagos, Africa
155 (
156 export TZ=Africa/Lagos;
157 export LANG="en_NG.UTF8";
158 id="LAGOS";
159 print_dateline "$@";
160 ); line_sep;
161
162 # Paris, France
163 (
164 export TZ=Europe/Paris;
165 export LANG="fr_FR.UTF8";
166 id="PARIS";
167 print_dateline "$@";
168 ); line_sep;
169
170 # Stockholm, Sweden
171 (
172 export TZ=Europe/Stockholm;
173 export LANG="sv_SE.UTF8";
174 id="STOCKHOLM";
175 print_dateline "$@";
176 ); line_sep;
177
178 # Cairo, Egypt
179 (
180 export TZ=Africa/Cairo;
181 export LANG="ar_EG.UTF8";
182 id="CAIRO";
183 print_dateline "$@";
184 ); line_sep;
185
186 # Athens (pop. (2020): 3,526,887)
187 (
188 export TZ=Europe/Athens;
189 export LANG="el_GR.UTF8";
190 id="ATHENS";
191 print_dateline "$@";
192 ); line_sep;
193
194 # Istanbul (pop. (2020): 13,719,061)
195 (
196 export TZ=Asia/Istanbul;
197 export LANG="tr_TR.UTF8";
198 id="ISTANBUL";
199 print_dateline "$@";
200 ); line_sep;
201
202 # Tehran, Iran
203 (
204 export TZ=Asia/Tehran;
205 export LANG="fa_IR.UTF8";
206 id="TEHRAN";
207 print_dateline "$@";
208 ); line_sep;
209
210 # Moscow, Russia
211 (
212 export TZ=Europe/Moscow;
213 export LANG="ru_RU.UTF-8";
214 id="MOSCOW";
215 print_dateline "$@";
216 ); line_sep;
217
218 # Kyiv, Ukraine (pop. (2021): 2,962,180)
219 (
220 export TZ=Europe/Kyiv;
221 export LANG="uk_UA.UTF-8";
222 id="KYIV";
223 print_dateline "$@";
224 ); line_sep;
225
226 # Delhi, India (pop. (2018): 29,000,000)
227 (
228 export TZ=Asia/Kolkata;
229 export LANG="hi_IN.UTF-8";
230 id="DELHI";
231 print_dateline "$@";
232 ); line_sep;
233
234 # Jakarta, Indonesia (pop. (2018): 33,430,285)
235 (
236 export TZ=Asia/Jakarta;
237 export LANG="id_ID.UTF8";
238 id="JAKARTA";
239 print_dateline "$@";
240 ); line_sep;
241
242 # Singapore, Singapore (pop (2018): 5,792,000)
243 (
244 export TZ=Asia/Singapore;
245 export LANG="en_SG.UTF-8";
246 id="SINGAPORE";
247 print_dateline "$@";
248 ); line_sep;
249
250 # Beijing, China (pop. (2018): 19,618,000)
251 (
252 export TZ=Asia/Shanghai; # [3]
253 export LANG="zh_CN.UTF-8";
254 id="BEIJING";
255 print_dateline "$@";
256 ); line_sep;
257
258 # Tokyo, Japan (pop. (2018): 37,274,000)
259 (
260 export TZ=Asia/Tokyo;
261 export LANG="ja_JP.UTF8";
262 id="TOKYO";
263 print_dateline "$@";
264 ); line_sep;
265
266 # Seoul, South Korea (pop. (2018): 25,514,000)
267 (
268 export TZ=Asia/Seoul;
269 export LANG="ko_KR.UTF8";
270 id="SEOUL";
271 print_dateline "$@";
272 ); line_sep;
273
274 # Sydney, Australia
275 (
276 export TZ=Australia/Sydney;
277 export LANG="en_AU.UTF8";
278 id="SYDNEY";
279 print_dateline "$@";
280 ); line_sep;
281
282 # Guam
283 (
284 export TZ=Pacific/Guam;
285 export LANG="en_GU.UTF8";
286 id="GUAM";
287 print_dateline "$@";
288 ); line_sep;
289
290 # Auckland, New Zealand
291 (
292 export TZ=Pacific/Auckland;
293 export LANG="en_NZ.UTF8";
294 id="AUCKLAND";
295 print_dateline "$@";
296 ); line_sep;
297
298 return 0;
299}; # main program
300
301main "$@";