Implement the Date in IST #7
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WalkthroughThe Dockerfile was updated to install timezone data, set the timezone to Asia/Kolkata, and adjust source code copying and compilation steps. In Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant JavaApp
participant OS
User->>JavaApp: Run application
JavaApp->>OS: Get current date/time
JavaApp->>JavaApp: Format date/time with SimpleDateFormat (Asia/Kolkata)
JavaApp->>User: Print formatted date/time
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Actionable comments posted: 0
🧹 Nitpick comments (2)
Dockerfile (1)
10-10: Consider using .dockerignore to exclude unnecessary files.The
COPY . .command copies the entire directory, which may include unnecessary files like.git, build artifacts, or other non-essential files that could increase the image size and potentially introduce security risks.Create a
.dockerignorefile to exclude unnecessary files:.git .gitignore *.md Dockerfile .dockerignore target/ *.classAlternatively, be more specific with the copy command:
-COPY . . +COPY src/ src/src/Main.java (1)
7-15: Implementation is correct but consider using modern date-time APIs.The current implementation correctly formats the date in IST timezone. However,
SimpleDateFormatis legacy and not thread-safe (though not a concern for this simple main method).For future improvements, consider using the modern
java.timeAPIs:-import java.text.SimpleDateFormat; -import java.util.Date; -import java.util.TimeZone; +import java.time.LocalDateTime; +import java.time.ZoneId; +import java.time.format.DateTimeFormatter; - Date now = new Date(); - SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss z"); - sdf.setTimeZone(TimeZone.getTimeZone("Asia/Kolkata")); - String currentDate = sdf.format(now); + LocalDateTime now = LocalDateTime.now(ZoneId.of("Asia/Kolkata")); + DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm:ss z"); + String currentDate = now.format(formatter);The modern APIs are thread-safe, more intuitive, and provide better performance.
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Dockerfile(1 hunks)src/Main.java(1 hunks)
🔇 Additional comments (5)
Dockerfile (3)
13-13: LGTM! Timezone data installation is correct.Installing
tzdatapackage is necessary for timezone support in Alpine-based images. This ensures the container can properly handle timezone conversions.
16-16: LGTM! Timezone environment variable is correctly set.Setting
TZ=Asia/Kolkataensures the container's default timezone is IST, which aligns with the Java application's timezone configuration.
19-19: LGTM! Java compilation approach is appropriate.The compilation command correctly compiles the source file and outputs the class files to the working directory for execution.
src/Main.java (2)
1-1: LGTM! Required imports are correctly added.The imports for
SimpleDateFormatandTimeZoneare necessary for the timezone-aware date formatting implementation.Also applies to: 3-3
11-11: LGTM! Timezone configuration is consistent with Docker settings.The timezone
"Asia/Kolkata"correctly represents IST and is consistent with theTZenvironment variable set in the Dockerfile.
1 participant
Purpose:
Implement Java application inside Docker container that displays current date and time in Indian Standard Time (IST).
Changes in Dockerfile:
Installed timezone data (tzdata) in Alpine-based Docker image:
RUN apk add --no-cache tzdata
Set timezone to Asia/Kolkata using:
ENV TZ=Asia/Kolkata
Ensured Java application inside the container uses IST instead of UTC.
Because the container often default UTC, regardless of what timezone your local is used so to make it available inside the docker container I made the docker container to use this timezone
Changes in Main.java:
Used SimpleDateFormat and TimeZone classes to format and display the date in IST:
Set TimeZone explicitly:
sdf.setTimeZone(TimeZone.getTimeZone("Asia/Kolkata"));
Made sure that the application prints the date in a human-readable format adjusted to IST.
✅ Summary Statement
Implemented timezone configuration in both Docker container and Java application to ensure consistent date-time output in Indian Standard Time (IST), using tzdata installation, ENV TZ in Dockerfile, and Java's SimpleDateFormat with TimeZone setting in Main.java.
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