fix(user/bkdatev):Make tzdata-legacy 'right/UTC' TZ optional

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

diff --git a/user/bkdatev b/user/bkdatev
index cea68837990e350b8c4c106b11097ea985010d46..fe604995ab6ae93673cb28c52fa9251923ccf2bc 100755 (executable)
--- a/user/bkdatev
+++ b/user/bkdatev
@@ -2,11 +2,12 @@
 # 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: 1.0.0
-# Depends: GNU Coreutils 8.32, Bash 3.2.57
+# Version: 1.0.3
+# 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
 # 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


@@ -145,7 +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;