fix(user/bkdatev):Fix --date='' functionality for right/UTC

[BK-2020-03.git] / user / bkdatev

diff --git a/user/bkdatev b/user/bkdatev
old mode 100644 (file)
new mode 100755 (executable)
index 3cc96d9..fb0b96c
--- a/user/bkdatev
+++ b/user/bkdatev
@@ -2,15 +2,20 @@
 # Desc: Baltakatei's verbose date command
 # Usage: bkdatev [args]
 # Example: bkdatev --date="2001-09-11T09:02:59-04"
 # Desc: Baltakatei's verbose date command
 # Usage: bkdatev [args]
 # Example: bkdatev --date="2001-09-11T09:02:59-04"

-# Version: 0.3.1
+# Version: 1.0.4
+# Depends: GNU Coreutils 8.32, Bash 3.2.57, tzdata-legacy

 # Ref/Attrib: [1] "ISO 8601". Wikipedia. https://en.wikipedia.org/wiki/ISO_8601
 #             [2] "Changing the Locale in Wine" https://stackoverflow.com/a/16428951
 #             [3] "Shanghai vs Beijing" https://bugs.launchpad.net/ubuntu/+source/libgweather/+bug/228554
 # Ref/Attrib: [1] "ISO 8601". Wikipedia. https://en.wikipedia.org/wiki/ISO_8601
 #             [2] "Changing the Locale in Wine" https://stackoverflow.com/a/16428951
 #             [3] "Shanghai vs Beijing" https://bugs.launchpad.net/ubuntu/+source/libgweather/+bug/228554

+#             [4] “Understanding the "right" time zone database” https://kenta.blogspot.com/2016/03/sqfzcxay-understanding-right-time-zone.html

 # Notes:  * Check `ls -R /usr/share/zoneinfo` for time zone names.
 #         * Check `cat /usr/share/i18n/SUPPORTED` for supported locales.
 #         * For list of valid locales, see: https://manpages.ubuntu.com/manpages/bionic/man3/DateTime::Locale::Catalog.3pm.html
 #         * Locations chosen for population, personal signifiance, and spatial coverage.
 #         * For International Atomic Time (TAI), use offsets from UTC provided in `/usr/share/zoneinfo/leap-seconds.list`.
 # Notes:  * Check `ls -R /usr/share/zoneinfo` for time zone names.
 #         * Check `cat /usr/share/i18n/SUPPORTED` for supported locales.
 #         * For list of valid locales, see: https://manpages.ubuntu.com/manpages/bionic/man3/DateTime::Locale::Catalog.3pm.html
 #         * Locations chosen for population, personal signifiance, and spatial coverage.
 #         * For International Atomic Time (TAI), use offsets from UTC provided in `/usr/share/zoneinfo/leap-seconds.list`.

+#         * Compatibility with macOS may be limited if any arguments
+#             are provided when running `bkdatev`; e.g. passing a
+#             `--date` option to `bkdatev` will fail.

 
 yell() { echo "$0: $*" >&2; }
 die() { yell "$*"; exit 111; }
 
 yell() { echo "$0: $*" >&2; }
 die() { yell "$*"; exit 111; }


@@ -71,12 +76,13 @@ get_tz_offset() {
     # Desc: Get from 'date' the timezone UTC offset in a way
     #   compatible with both GNU Coreutils and BSD versions.
     # Input: env var: TZ  (time zone for date; e.g. 'America/Denver')
     # Desc: Get from 'date' the timezone UTC offset in a way
     #   compatible with both GNU Coreutils and BSD versions.
     # Input: env var: TZ  (time zone for date; e.g. 'America/Denver')

+    #        args: $@     # passed onto `date`

     # Depends: date (GNU Coreutils 8.32 or BSD), rev
     local ntz ntz ntz_out;
     local last2;
 
     # Get numeric time zone string in way compatible with GNU Coreutils and BSD
     # Depends: date (GNU Coreutils 8.32 or BSD), rev
     local ntz ntz ntz_out;
     local last2;
 
     # Get numeric time zone string in way compatible with GNU Coreutils and BSD

-    ntz="$(date "+%z")"; # e.g. "+0530"
+    ntz="$(date "+%z" "$@")"; # e.g. "+0530"

 
     # Check if last two characters are trailing zeros that can be removed.
     last2="${ntz:3:2}"; # assumes $ntz is 5 characters (i.e. "±HHMM")
 
     # Check if last two characters are trailing zeros that can be removed.
     last2="${ntz:3:2}"; # assumes $ntz is 5 characters (i.e. "±HHMM")


@@ -99,7 +105,7 @@ print_dateline() {
     #        var: $fs_1
     #        var: $fs_2
     #        var: $fs_3
     #        var: $fs_1
     #        var: $fs_2
     #        var: $fs_3

-    #        args: $@
+    #        args: $@   # passed on to `date`

     #        env var: TZ (time zone for date; e.g. 'America/Denver')
     # Output: stdout
     # Depends: printf, date
     #        env var: TZ (time zone for date; e.g. 'America/Denver')
     # Output: stdout
     # Depends: printf, date


@@ -111,10 +117,10 @@ print_dateline() {
     s_2="$(date "$@" "$fs_1")"; # ISO-8601 without numeric timezone
     s_3="$(date "$@" "$fs_2")"; # Alternate ISO-8601 expressions
     s_4="$(date "$@" "$fs_3")"; # locale-specific date strings
     s_2="$(date "$@" "$fs_1")"; # ISO-8601 without numeric timezone
     s_3="$(date "$@" "$fs_2")"; # Alternate ISO-8601 expressions
     s_4="$(date "$@" "$fs_3")"; # locale-specific date strings

-
+    

     # Append numeric timezone to $s_2 with appropriate format
     #   (e.g. '-07' for 'Arizona', '+05:45' for 'Asia/Kathmandu')
     # Append numeric timezone to $s_2 with appropriate format
     #   (e.g. '-07' for 'Arizona', '+05:45' for 'Asia/Kathmandu')

-    s_2_tz="$(get_tz_offset)";
+    s_2_tz="$(get_tz_offset "$@")";

     s_2="$( printf "%s%s" "$s_2" "$s_2_tz" )";
 
     printf "%-10.10s %-25.25s (%-20.20s) (%s)" "$s_1" "$s_2" "$s_3" "$s_4";
     s_2="$( printf "%s%s" "$s_2" "$s_2_tz" )";
 
     printf "%-10.10s %-25.25s (%-20.20s) (%s)" "$s_1" "$s_2" "$s_3" "$s_4";


@@ -140,7 +146,14 @@ main() {
     (
         export TZ=UTC;
         id="UTC";
     (
         export TZ=UTC;
         id="UTC";

-        fs_3="+%s seconds since 1970-01-01T00:00+00";
+        path_right_tz="/usr/share/zoneinfo/right/UTC";
+        if [[ -f "$path_right_tz" ]]; then
+            date_string="$(date -Is "$@"; )";
+            right_epoch="$(TZ=right/UTC date --date="$date_string" +%s;)"; # see [4]
+            fs_3="+%s POSIX seconds (${right_epoch} real) since 1970-01-01T00:00+00";
+        else
+            fs_3="+%s POSIX seconds since 1970-01-01T00:00+00";
+        fi;

         print_dateline "$@";
     ); line_sep;
 
         print_dateline "$@";
     ); line_sep;
 


@@ -256,6 +269,14 @@ main() {
         print_dateline "$@";
     ); line_sep;
 
         print_dateline "$@";
     ); line_sep;
 

+    # Helsinki, Finland
+    (
+        export TZ=Europe/Helsinki;
+        export LANG="fi_FI.UTF8";
+        id="HELSINKI";
+        print_dateline "$@";
+    ); line_sep;
+

     # Cairo, Egypt
     (
         export TZ=Africa/Cairo;
     # Cairo, Egypt
     (
         export TZ=Africa/Cairo;


@@ -264,6 +285,22 @@ main() {
         print_dateline "$@";
     ); line_sep;
 
         print_dateline "$@";
     ); line_sep;
 

+    # Gaza City, Palestine (pop. (2017): 590,481)
+    (
+        export TZ=Asia/Gaza;
+        export LANG="ar_JO.UTF-8"; # ar_PS is missing as of 2023-10-18, using ar_JO as closest substitute.
+        id="GAZA";
+        print_dateline "$@";
+    ); line_sep;
+
+    # Tel Aviv, Israel (pop. (2021): 467,875)
+    (
+        export TZ=Asia/Tel_Aviv;
+        export LANG="he_IL.UTF-8";
+        id="TEL AVIV";
+        print_dateline "$@";
+    ); line_sep;
+

     # Athens (pop. (2020): 3,526,887)
     (
         export TZ=Europe/Athens;
     # Athens (pop. (2020): 3,526,887)
     (
         export TZ=Europe/Athens;