Add tzdata to allow changing timezone and use UTC for logging (#5)

Dockerfile

@@ -4,7 +4,7 @@ LABEL maintainers="[email protected]"
 LABEL org.opencontainers.image.source=https://github.com/WikiTeq/docker-cron
 
 # Install required tools
-RUN apk add --no-cache jq curl docker-cli
+RUN apk add --no-cache jq curl docker-cli tzdata
 
 # Latest releases available at https://github.com/aptible/supercronic/releases
 ENV SUPERCRONIC_URL=https://github.com/aptible/supercronic/releases/download/v0.2.32/supercronic-linux-amd64 \

README.md

@@ -20,6 +20,7 @@ services:
     environment:
       - COMPOSE_PROJECT_NAME=${COMPOSE_PROJECT_NAME}
       - DEBUG=${CRON_DEBUG:-0}
+      - TZ=America/New_York
 
   app:
     build: ./app
@@ -38,4 +39,4 @@ The `example_compose.yml` file uses several environment variables. Make sure to
 - `COMPOSE_PROJECT_NAME`: if defined, the cron looks for the jobs in this compose project only
 - `DEBUG`: when it is `true`, it outputs more iformation for debugging
 - `CRON_LOG_DIR`: the directory where cron puts the log files of the executed jobs, `/var/log/cron` by default
-
+- `TZ` timezone used for scheduling the cron jobs

update_cron.sh

@@ -11,7 +11,7 @@ CRON_LOG_DIR=${CRON_LOG_DIR:-/var/log/cron}
 mkdir -p "$CRON_LOG_DIR"
 
 timestamp() {
-  date "+%Y-%m-%d %H:%M:%S"
+  date -u "+%Y-%m-%d %H:%M:%S %Z"
 }
 
 # Function to extract specific cron job labels from a container
@@ -65,7 +65,7 @@ for container in $containers; do
       # Check if both schedule and command labels are set
       if [ -n "$job_schedule" ] && [ -n "$job_command" ]; then
         target_container=$(docker inspect -f '{{.Name}}' "$container" | cut -c2-) # Remove leading /
-        cron_entry="$job_schedule docker exec $target_container sh -c '$job_command' 2>&1 | tee -a $CRON_LOG_DIR/\$(date +\%Y-\%m-\%d_\%H-\%M-\%S)-$job_key.log"
+        cron_entry="$job_schedule docker exec $target_container sh -c '$job_command' 2>&1 | tee -a $CRON_LOG_DIR/\$(date -u +\%Y-\%m-\%d_\%H-\%M-\%S_\%Z)_$job_key.log"
         echo "$cron_entry" >> $CRON_FILE_NEW # Write in one line to the cron file
         log "Scheduled task for $target_container: $cron_entry"
       else