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: 0.2.2
   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" "$s_4";
  41     printf "\n";
  42
  43     unset fs_1 fs_2 fs_3 fs_4;
  44     }; # print line of dates
  45 main() {
  46     n_ln=0; # for line_sep()
  47     unset LC_TIME; # Fall back to time zone-specific locale settings.
  48
  49     # format strings
  50     fs_iso8601="+%Y-%m-%dT%H:%M:%S%:::z"; # typical ISO-8601
  51     fs_iso8601_etc="+%G-W%V-%u, %Y-%j"; # alternate ISO-8601 dates
  52     fs_locale="+%Z; %A; %c"; # locale-specific date strings
  53
  54     # vars for print_dateline()
  55     fs_1="$fs_iso8601";
  56     fs_2="$fs_iso8601_etc";
  57     fs_3="$fs_locale";
  58
  59     # UTC (pop. (2021): 7,837,000,000)
  60     (
  61         export TZ=UTC;
  62         id="UTC";
  63         fs_3="+%s seconds since 1970-01-01T00:00+00";
  64         print_dateline "$@";
  65     ); line_sep;
  66
  67     # Hawaii
  68     (
  69         export TZ=US/Hawaii;
  70         export LANG="haw-US.UTF8";
  71         id="HAWAII";
  72         print_dateline "$@";
  73     ); line_sep;
  74
  75     # Los Angeles, USA
  76     (
  77         export TZ=America/Los_Angeles;
  78         export LANG="en_US.UTF-8";
  79         id="LOS ANGELES";
  80         print_dateline "$@";
  81     ); line_sep;
  82
  83     # Denver, USA (pop. (2021): 711,463)
  84     (
  85         export TZ=America/Denver;
  86         export LANG="en_US.UTF-8";
  87         id="DENVER";
  88         print_dateline "$@";
  89     ); line_sep;
  90
  91     # Chicago, USA (pop. (2021): 711,463)
  92     (
  93         export TZ=America/Chicago;
  94         export LANG="en_US.UTF-8";
  95         id="CHICAGO";
  96         print_dateline "$@";
  97     ); line_sep;
  98
  99     # Mexico City, Mexico (pop. (2018): 21,804,515)
 100     (
 101         export TZ=America/Mexico_City;
 102         export LANG="es_MX.UTF8";
 103         id="MEXICO CITY";
 104         print_dateline "$@";
 105     ); line_sep;
 106
 107     # Panama City, Panama
 108     (
 109         export TZ=America/Panama;
 110         export LANG="es_PA.UTF8";
 111         id="PANAMA CITY";
 112         print_dateline "$@";
 113     ); line_sep;
 114
 115     # New York, USA (pop. (2018): 20,140,470)
 116     (
 117         export TZ=America/New_York;
 118         export LANG="en_US.UTF-8";
 119         id="NEW YORK";
 120         print_dateline "$@";
 121     ); line_sep;
 122
 123     # São Paulo, Brazil
 124     (
 125         export TZ=America/Sao_Paulo;
 126         export LANG="pt_BR.UTF8";
 127         id="SAO PAULO";
 128         print_dateline "$@";
 129     ); line_sep;
 130
 131     # Buenos Aires
 132     (
 133         export TZ=America/Argentina/Buenos_Aires;
 134         export LANG="es_AR.UTF8";
 135         id="BUENOS AIRES";
 136         print_dateline "$@";
 137     ); line_sep;
 138
 139     # London, England
 140     (
 141         export TZ=Europe/London;
 142         export LANG="en_GB.UTF-8";
 143         id="LONDON";
 144         print_dateline "$@";
 145     ); line_sep;
 146
 147     # Kinshasa, Africa
 148     (
 149         export TZ=Africa/Kinshasa;
 150         export LANG="ln_CD.UTF8";
 151         id="KINSHASA";
 152         print_dateline "$@";
 153     ); line_sep;
 154
 155     # Lagos, Africa
 156     (
 157         export TZ=Africa/Lagos;
 158         export LANG="en_NG.UTF8";
 159         id="LAGOS";
 160         print_dateline "$@";
 161     ); line_sep;
 162
 163     # Paris, France
 164     (
 165         export TZ=Europe/Paris;
 166         export LANG="fr_FR.UTF8";
 167         id="PARIS";
 168         print_dateline "$@";
 169     ); line_sep;
 170
 171     # Stockholm, Sweden
 172     (
 173         export TZ=Europe/Stockholm;
 174         export LANG="sv_SE.UTF8";
 175         id="STOCKHOLM";
 176         print_dateline "$@";
 177     ); line_sep;
 178
 179     # Cairo, Egypt
 180     (
 181         export TZ=Africa/Cairo;
 182         export LANG="ar_EG.UTF8";
 183         id="CAIRO";
 184         print_dateline "$@";
 185     ); line_sep;
 186
 187     # Athens (pop. (2020): 3,526,887)
 188     (
 189         export TZ=Europe/Athens;
 190         export LANG="el_GR.UTF8";
 191         id="ATHENS";
 192         print_dateline "$@";
 193     ); line_sep;
 194
 195     # Istanbul (pop. (2020): 13,719,061)
 196     (
 197         export TZ=Asia/Istanbul;
 198         export LANG="tr_TR.UTF8";
 199         id="ISTANBUL";
 200         print_dateline "$@";
 201     ); line_sep;
 202
 203     # Tehran, Iran
 204     (
 205         export TZ=Asia/Tehran;
 206         export LANG="fa_IR.UTF8";
 207         id="TEHRAN";
 208         print_dateline "$@";
 209     ); line_sep;
 210
 211     # Moscow, Russia
 212     (
 213         export TZ=Europe/Moscow;
 214         export LANG="ru_RU.UTF-8";
 215         id="MOSCOW";
 216         print_dateline "$@";
 217     ); line_sep;
 218
 219     # Kyiv, Ukraine (pop. (2021): 2,962,180)
 220     (
 221         export TZ=Europe/Kyiv;
 222         export LANG="uk_UA.UTF-8";
 223         id="KYIV";
 224         print_dateline "$@";
 225     ); line_sep;
 226
 227     # Delhi, India (pop. (2018): 29,000,000)
 228     (
 229         export TZ=Asia/Kolkata;
 230         export LANG="hi_IN.UTF-8";
 231         id="DELHI";
 232         print_dateline "$@";
 233     ); line_sep;
 234
 235     # Jakarta, Indonesia (pop. (2018): 33,430,285)
 236     (
 237         export TZ=Asia/Jakarta;
 238         export LANG="id_ID.UTF8";
 239         id="JAKARTA";
 240         print_dateline "$@";
 241     ); line_sep;
 242
 243     # Singapore, Singapore (pop (2018): 5,792,000)
 244     (
 245         export TZ=Asia/Singapore;
 246         export LANG="en_SG.UTF-8";
 247         id="SINGAPORE";
 248         print_dateline "$@";
 249     ); line_sep;
 250
 251     # Beijing, China (pop. (2018): 19,618,000)
 252     (
 253         export TZ=Asia/Shanghai; # [3]
 254         export LANG="zh_CN.UTF-8";
 255         id="BEIJING";
 256         print_dateline "$@";
 257     ); line_sep;
 258
 259     # Taipei, Taiwan (pop (2019): 7,034,084)
 260     (
 261         export TZ=Asia/Taipei; # [3]
 262         export LANG="zh_TW.UTF-8";
 263         id="TAIPEI";
 264         print_dateline "$@";
 265     ); line_sep;
 266
 267     # Tokyo, Japan (pop. (2018): 37,274,000)
 268     (
 269         export TZ=Asia/Tokyo;
 270         export LANG="ja_JP.UTF8";
 271         id="TOKYO";
 272         print_dateline "$@";
 273     ); line_sep;
 274
 275     # Seoul, South Korea (pop. (2018): 25,514,000)
 276     (
 277         export TZ=Asia/Seoul;
 278         export LANG="ko_KR.UTF8";
 279         id="SEOUL";
 280         print_dateline "$@";
 281     ); line_sep;
 282
 283     # Pyongyang, North Korea
 284     (
 285         export TZ=Asia/Pyongyang;
 286         export LANG="ko_KP.UTF8";
 287         id="PYONGYANG";
 288         print_dateline "$@";
 289     ); line_sep;
 290
 291     # Sydney, Australia
 292     (
 293         export TZ=Australia/Sydney;
 294         export LANG="en_AU.UTF8";
 295         id="SYDNEY";
 296         print_dateline "$@";
 297     ); line_sep;
 298
 299     # Guam
 300     (
 301         export TZ=Pacific/Guam;
 302         export LANG="en_GU.UTF8";
 303         id="GUAM";
 304         print_dateline "$@";
 305     ); line_sep;
 306
 307     # Auckland, New Zealand
 308     (
 309         export TZ=Pacific/Auckland;
 310         export LANG="en_NZ.UTF8";
 311         id="AUCKLAND";
 312         print_dateline "$@";
 313     ); line_sep;
 314
 315     return 0;
 316 }; # main program
 317
 318 main "$@";