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: 0.0.1
   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
  14 line_sep() {
  15     # Input: var: n_ln
  16     local skip_every=4;
  17     ((n_ln++));
  18     if ! ((n_ln % "$skip_every")); then
  19         printf "\n";
  20     fi;
  21     return 0;
  22 }; # periodically print separating blank line
  23 print_dateline() {
  24     # Input: var: $id
  25     #        var: $fs_1
  26     #        var: $fs_2
  27     #        var: $fs_3
  28     #        args: $@
  29     # Output: stdout
  30     # Depends: printf, date
  31     # Ref/Attrib: * Truncate string in printf https://stackoverflow.com/a/46812677
  32     local s_1 s_2 s_3 s_4;
  33
  34     s_1="$id";
  35     s_2="$(date "$@" "$fs_1")";
  36     s_3="$(date "$@" "$fs_2")";
  37     s_4="$(date "$@" "$fs_3")";
  38
  39     printf "%-10.10s %-25.25s (%-20.20s) (%s)" "$s_1" "$s_2" "$s_3" "$s_4";
  40     printf "\n";
  41
  42     unset fs_1 fs_2 fs_3 fs_4;
  43     }; # print line of dates
  44 main() {
  45     n_ln=0; # for line_sep()
  46
  47     # format strings
  48     fs_iso8601="+%Y-%m-%dT%H:%M:%S%:::z"; # typical ISO-8601
  49     fs_iso8601_etc="+%G-W%V-%u, %Y-%j"; # alternate ISO-8601 dates
  50     fs_locale="+%Z; %A; %c"; # locale-specific date strings
  51
  52     # vars for print_dateline()
  53     fs_1="$fs_iso8601";
  54     fs_2="$fs_iso8601_etc";
  55     fs_3="$fs_locale";
  56
  57     # UTC (pop. (2021): 7,837,000,000)
  58     (
  59         export TZ=UTC;
  60         id="UTC";
  61         print_dateline "$@";
  62     ); line_sep;
  63
  64     # Hawaii
  65     (
  66         export TZ=US/Hawaii;
  67         export LANG="haw-US.UTF8";
  68         id="HAWAII";
  69         print_dateline "$@";
  70     ); line_sep;
  71
  72     # Los Angeles, USA
  73     (
  74         export TZ=America/Los_Angeles;
  75         export LANG="en_US.UTF-8";
  76         id="LOS ANGELES";
  77         print_dateline "$@";
  78     ); line_sep;
  79
  80     # Denver, USA (pop. (2021): 711,463)
  81     (
  82         export TZ=America/Denver;
  83         export LANG="en_US.UTF-8";
  84         id="DENVER";
  85         print_dateline "$@";
  86     ); line_sep;
  87
  88     # Chicago, USA (pop. (2021): 711,463)
  89     (
  90         export TZ=America/Chicago;
  91         export LANG="en_US.UTF-8";
  92         id="CHICAGO";
  93         print_dateline "$@";
  94     ); line_sep;
  95
  96     # Mexico City, Mexico (pop. (2018): 21,804,515)
  97     (
  98         export TZ=America/Mexico_City;
  99         export LANG="es_MX.UTF8";
 100         id="MEXICO CITY";
 101         print_dateline "$@";
 102     ); line_sep;
 103
 104     # Panama City, Panama
 105     (
 106         export TZ=America/Panama;
 107         export LANG="es_PA.UTF8";
 108         id="PANAMA CITY";
 109         print_dateline "$@";
 110     ); line_sep;
 111
 112     # New York, USA (pop. (2018): 20,140,470)
 113     (
 114         export TZ=America/New_York;
 115         export LANG="en_US.UTF-8";
 116         id="NEW YORK";
 117         print_dateline "$@";
 118     ); line_sep;
 119
 120     # São Paulo, Brazil
 121     (
 122         export TZ=America/Sao_Paulo;
 123         export LANG="pt_BR.UTF8";
 124         id="SAO PAULO";
 125         print_dateline "$@";
 126     ); line_sep;
 127
 128     # Buenos Aires
 129     (
 130         export TZ=America/Argentina/Buenos_Aires;
 131         export LANG="es_AR.UTF8";
 132         id="BUENOS AIRES";
 133         print_dateline "$@";
 134     ); line_sep;
 135
 136     # London, England
 137     (
 138         export TZ=Europe/London;
 139         export LANG="en_GB.UTF-8";
 140         id="LONDON";
 141         print_dateline "$@";
 142     ); line_sep;
 143
 144     # Kinshasa, Africa
 145     (
 146         export TZ=Africa/Kinshasa;
 147         export LANG="ln_CD.UTF8";
 148         id="KINSHASA";
 149         print_dateline "$@";
 150     ); line_sep;
 151
 152     # Lagos, Africa
 153     (
 154         export TZ=Africa/Lagos;
 155         export LANG="en_NG.UTF8";
 156         id="LAGOS";
 157         print_dateline "$@";
 158     ); line_sep;
 159
 160     # Paris, France
 161     (
 162         export TZ=Europe/Paris;
 163         export LANG="fr_FR.UTF8";
 164         id="PARIS";
 165         print_dateline "$@";
 166     ); line_sep;
 167
 168     # Stockholm, Sweden
 169     (
 170         export TZ=Europe/Stockholm;
 171         export LANG="sv_SE.UTF8";
 172         id="STOCKHOLM";
 173         print_dateline "$@";
 174     ); line_sep;
 175
 176     # Cairo, Egypt
 177     (
 178         export TZ=Africa/Cairo;
 179         export LANG="ar_EG.UTF8";
 180         id="CAIRO";
 181         print_dateline "$@";
 182     ); line_sep;
 183
 184     # Athens (pop. (2020): 3,526,887)
 185     (
 186         export TZ=Europe/Athens;
 187         export LANG="el_GR.UTF8";
 188         id="ATHENS";
 189         print_dateline "$@";
 190     ); line_sep;
 191
 192     # Istanbul (pop. (2020): 13,719,061)
 193     (
 194         export TZ=Asia/Istanbul;
 195         export LANG="tr_TR.UTF8";
 196         id="ISTANBUL";
 197         print_dateline "$@";
 198     ); line_sep;
 199
 200     # Tehran, Iran
 201     (
 202         export TZ=Asia/Tehran;
 203         export LANG="fa_IR.UTF8";
 204         id="TEHRAN";
 205         print_dateline "$@";
 206     ); line_sep;
 207
 208     # Moscow, Russia
 209     (
 210         export TZ=Europe/Moscow;
 211         export LANG="ru_RU.UTF-8";
 212         id="MOSCOW";
 213         print_dateline "$@";
 214     ); line_sep;
 215
 216     # Kyiv, Ukraine (pop. (2021): 2,962,180)
 217     (
 218         export TZ=Europe/Kyiv;
 219         export LANG="uk_UA.UTF-8";
 220         id="KYIV";
 221         print_dateline "$@";
 222     ); line_sep;
 223
 224     # Delhi, India (pop. (2018): 29,000,000)
 225     (
 226         export TZ=Asia/Kolkata;
 227         export LANG="hi_IN.UTF-8";
 228         id="DELHI";
 229         print_dateline "$@";
 230     ); line_sep;
 231
 232     # Jakarta, Indonesia (pop. (2018): 33,430,285)
 233     (
 234         export TZ=Asia/Jakarta;
 235         export LANG="id_ID.UTF8";
 236         id="JAKARTA";
 237         print_dateline "$@";
 238     ); line_sep;
 239
 240     # Singapore, Singapore (pop (2018): 5,792,000)
 241     (
 242         export TZ=Asia/Singapore;
 243         export LANG="en_SG.UTF-8";
 244         id="SINGAPORE";
 245         print_dateline "$@";
 246     ); line_sep;
 247
 248     # Beijing, China (pop. (2018): 19,618,000)
 249     (
 250         export TZ=Asia/Shanghai; # [3]
 251         export LANG="zh_CN.UTF-8";
 252         id="BEIJING";
 253         print_dateline "$@";
 254     ); line_sep;
 255
 256     # Tokyo, Japan (pop. (2018): 37,274,000)
 257     (
 258         export TZ=Asia/Tokyo;
 259         export LANG="ja_JP.UTF8";
 260         id="TOKYO";
 261         print_dateline "$@";
 262     ); line_sep;
 263
 264     # Seoul, South Korea (pop. (2018): 25,514,000)
 265     (
 266         export TZ=Asia/Seoul;
 267         export LANG="ko_KR.UTF8";
 268         id="SEOUL";
 269         print_dateline "$@";
 270     ); line_sep;
 271
 272     # Sydney, Australia
 273     (
 274         export TZ=Australia/Sydney;
 275         export LANG="en_AU.UTF8";
 276         id="SYDNEY";
 277         print_dateline "$@";
 278     ); line_sep;
 279
 280     # Guam
 281     (
 282         export TZ=Pacific/Guam;
 283         export LANG="en_GU.UTF8";
 284         id="GUAM";
 285         print_dateline "$@";
 286     ); line_sep;
 287
 288     # Auckland, New Zealand
 289     (
 290         export TZ=Pacific/Auckland;
 291         export LANG="en_NZ.UTF8";
 292         id="AUCKLAND";
 293         print_dateline "$@";
 294     ); line_sep;
 295
 296     return 0;
 297 }; # main program
 298
 299 main "$@";