user/bkdatev

   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
  15 line_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
  24 print_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" "$s_4";
  41     printf "\n";
  42
  43     unset fs_1 fs_2 fs_3 fs_4;
  44     }; # print line of dates
  45 main() {
  46     n_ln=0; # for line_sep()
  47
  48     # format strings
  49     fs_iso8601="+%Y-%m-%dT%H:%M:%S%:::z"; # typical ISO-8601
  50     fs_iso8601_etc="+%G-W%V-%u, %Y-%j"; # alternate ISO-8601 dates
  51     fs_locale="+%Z; %A; %c"; # locale-specific date strings
  52
  53     # vars for print_dateline()
  54     fs_1="$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
 301 main "$@";