style(unitproc):appendFileTar():VAR_NAME to varName

[BK-2020-03.git] / unitproc / bktemp-dateTimeShort

diff --git a/unitproc/bktemp-dateTimeShort b/unitproc/bktemp-dateTimeShort
index fe30617244007c98f47a3549f88556d5b5325d63..2a31d1f71bec27cc301fd3f056a99ae3002a5869 100644 (file)
--- a/unitproc/bktemp-dateTimeShort
+++ b/unitproc/bktemp-dateTimeShort
@@ -2,18 +2,48 @@
 
 # Desc: Template to display date and time.
 
+yell() { echo "$0: $*" >&2; }      #o Yell, Die, Try Three-Fingered Claw technique
+die() { yell "$*"; exit 111; }     #o Ref/Attrib: https://stackoverflow.com/a/25515370
+try() { "$@" || die "cannot $*"; } #o
 dateTimeShort(){
     # Desc: Timestamp without separators (YYYYmmddTHHMMSS+zzzz)
-    # Usage: dateTimeShort
+    # Usage: dateTimeShort ([str date])
+    # Version 1.1.1
+    # Input: arg1: 'date'-parsable timestamp string (optional)
     # Output: stdout: timestamp (ISO-8601, no separators)
-    local TIME_CURRENT TIME_CURRENT_SHORT
-    TIME_CURRENT="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
-    TIME_CURRENT_SHORT="$(date -d "$TIME_CURRENT" +%Y%m%dT%H%M%S%z)"; # Produce separator-less current timestamp with resolution 1 second.
-    echo "$TIME_CURRENT_SHORT";
-} # Get date&time without separators
+    # Depends: yell
+    local argTime timeCurrent timeInput timeCurrentShort
+
+    argTime="$1";
+    # Get Current Time
+    timeCurrent="$(date --iso-8601=seconds)" ; # Produce `date`-parsable current timestamp with resolution of 1 second.
+    # Decide to parse current or supplied date
+    ## Check if time argument empty
+    if [[ -z "$argTime" ]]; then
+       ## T: Time argument empty, use current time
+       timeInput="$timeCurrent";
+    else
+       ## F: Time argument exists, validate time
+       if date --date="$argTime" 1>/dev/null 2>&1; then
+           ### T: Time argument is valid; use it
+           timeInput="$argTime";
+       else
+           ### F: Time argument not valid; exit
+           yell "ERROR:Invalid time argument supplied. Exiting."; exit 1;
+       fi
+    fi
+    # Construct and deliver separator-les date string
+    timeCurrentShort="$(date -d "$timeInput" +%Y%m%dT%H%M%S%z)";
+    echo "$timeCurrentShort";
+} # Get YYYYmmddTHHMMSS±zzzz
 
 #==BEGIN sample code==
-echo "The current day and time is:$(dateTimeShort)"
+echo "The current day and time is :$(dateTimeShort)";
+echo "Contact lost with STS-107 on:$(dateTimeShort "2003-02-01T08:59:15-05:00")";
+echo "Bitcoin started on          :$(dateTimeShort "@1231006505")";
+testDate="2020-07-07T02:30:11,690097074+00:00";
+echo "This string was generated using 'date --iso-8601=ns':$testDate";
+echo "Using dateTimeShort, it appears as:$(dateTimeShort "$testDate")";
 #==END sample code==
 
 # Author: Steven Baltakatei Sandoval