100 DataWeave Problems: Date & Time Functions | Volume 7

Date & Time Functions

100 Hands-On Problems for Mastering Dates, Times, DateTime Conversion & Temporal Logic

Date and time transformations are among the most common—and sometimes most confusing—requirements in MuleSoft integrations.

Different systems may use different date formats, time zones, timestamps, or date representations. You may need to calculate an expiry date, compare two timestamps, determine an employee's age, or convert an API timestamp into the exact format required by a downstream system.

This volume provides 100 practical DataWeave problems focused entirely on date and time processing.

📚 What's Inside

100 practical problems covering:

• Date
• Time
• DateTime
• LocalDateTime
• LocalTime
• Date & Time Formatting
• Format Patterns
• String → Date Conversion
• String → DateTime Conversion
• Date → String Conversion
• DateTime → String Conversion
• Date Arithmetic
• Adding & Subtracting Days
• Adding & Subtracting Months
• Date Differences
• Date Comparisons
• Time Comparisons
• DateTime Comparisons
• Time Zones & Offsets
• Timestamps
• Conditional Date Logic
• Real-World Date & Time Scenarios

🛠️ Real-World Integration Scenarios

Solve problems involving:

• Converting API timestamps
• Formatting database dates
• Converting CSV date values
• Calculating order delivery dates
• Determining subscription expiry dates
• Comparing transaction timestamps
• Calculating employee age
• Finding the number of days between dates
• Adding business-related durations
• Handling different date formats
• Converting UTC timestamps
• Processing appointment dates
• Validating date ranges
• Building date-based business rules
• Transforming dates between systems

💡 Every Problem Includes

Scenario → Input → Requirement → DataWeave Code → Output → Explanation

Each problem is designed to show not only how DataWeave date/time functions work, but also how they are applied in realistic MuleSoft integration requirements.

🎯 What You'll Learn

By completing these 100 problems, you'll become confident with:

• Working with Date, Time and DateTime
• Parsing date strings
• Formatting dates using patterns
• Converting between date/time types
• Adding and subtracting time periods
• Comparing dates and timestamps
• Calculating differences between dates
• Working with time zones and offsets
• Handling API timestamps
• Building date-based conditions
• Validating date ranges
• Handling different source-system formats
• Combining date functions with other DataWeave logic
• Solving real-world temporal transformation problems

📈 Progressive Difficulty

The problems progress from basic date formatting to advanced date/time transformation scenarios.

You'll start with simple conversions and formatting and gradually move toward date arithmetic, comparisons, time-zone handling, conditional logic, and multi-step integration transformations.

👨‍💻 Who Is This For?

Perfect for:

• MuleSoft Developers
• DataWeave Developers
• Integration Developers
• MuleSoft Interview Candidates
• DataWeave Beginners
• Developers preparing for DataWeave coding rounds
• Professionals working with API, database, Salesforce and healthcare integrations

🚀 Why This Book?

Date and time data can look simple—but integration projects frequently expose difficult edge cases.

Different systems may expect:

2026-08-31

31/08/2026

2026-08-31T10:30:00

2026-08-31T10:30:00Z

Knowing how to correctly parse, format, compare and manipulate these values is an essential DataWeave skill.

This volume gives you 100 focused problems to build that skill through practice.

Learn the function. Solve the problem. Understand the transformation. Build production-ready DataWeave skills.

📖 Part of the 1000 DataWeave Problems with Solutions Series

Volume 7 — Date & Time Functions

100 Problems • 100 Solutions • Real Integration Scenarios

Master DataWeave date and time transformations one problem at a time.