RUN sudo echo "America/Los_Angeles" > /etc/timezone

docker run -v /etc/timezone:/etc/timezone [image-name]

$ cat /etc/timezone
America/Los_Angeles
$ date
Tue Apr 14 23:46:51 UTC 2015

ENV TZ=America/Los_Angeles
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone

docker run -e TZ=Europe/Amsterdam debian:jessie date

# Relocate the timezone file
RUN mkdir -p /config/etc && mv /etc/timezone /config/etc/ && ln -s /config/etc/timezone /etc/

# Set timezone as specified in /config/etc/timezone
dpkg-reconfigure -f noninteractive tzdata

# Set the time zone
RUN echo "Europe/London" > /config/etc/timezone

volumes:
    - "/etc/timezone:/etc/timezone:ro"
    - "/etc/localtime:/etc/localtime:ro"

ENV TZ 'Europe/Tallinn'
    RUN echo $TZ > /etc/timezone &&
    apt-get update && apt-get install -y tzdata &&
    rm /etc/localtime &&
    ln -snf /usr/share/zoneinfo/$TZ /etc/localtime &&
    dpkg-reconfigure -f noninteractive tzdata &&
    apt-get clean

>docker run -it ubuntu:trusty /bin/bash
#dpkg-reconfigure tzdata

>docker commit [container-id] chocko/ubuntu:local

FROM chocko/ubuntu:local

# Change the docker default timezone from UTC to SGT
echo "Asia/Singapore" > /etc/timezone
dpkg-reconfigure tzdata
date

ENV TZ=America/Toronto
RUN apk update
RUN apk upgrade
RUN apk add ca-certificates && update-ca-certificates
RUN apk add --update tzdata
RUN rm -rf /var/cache/apk/*