Table of Contents

• Chapter 1: Introduction to Date and Time in Java 1
  • The Importance of Date and Time Handling1
  • A Brief History: From Date to java.time (Java 8)2
  • Installing and Configuring Your Development Environment6
Chapter 2: Working with Local Dates 8
• Creating a LocalDate Instance8
• Getting the Current Date10
• Extracting Date Components (Year, Month, Day)11
• Comparing Dates13
• Modifying Dates (Plus, Minus, With)15
• Parsing and Formatting LocalDate17
Chapter 3: Working with Local Times 19
• Creating a LocalTime Instance19
• Extracting Time Components (Hour, Minute, Second)21
• Time Arithmetic22
• Parsing and Formatting LocalTime24
Chapter 4: LocalDateTime Combining Date and Time 26
• Creating LocalDateTime Instances26
• Working with Date and Time Parts28
• Modifying LocalDateTime29
• Comparing LocalDateTime31
• Parsing and Formatting17
Chapter 5: Zoned and Offset Date-Time Types 34
• Understanding Time Zones34
• Using ZoneId and ZonedDateTime36
• Working with OffsetDateTime and OffsetTime38
• Converting Between Time Zones40
• Handling Daylight Saving Time Transitions42
Chapter 6: Duration and Period 45
• Measuring Elapsed Time with Duration45
• Representing Date-Based Amounts with Period47
• Adding and Subtracting Durations and Periods49
• Converting Between Duration, Period, and Units51
Chapter 7: Temporal Adjusters 54
• Using Built-in Temporal Adjusters54
• Creating Custom Temporal Adjusters56
• Practical Use Cases (e.g., Next Monday, Last Day of Month)61
Chapter 8: Formatting and Parsing with `DateTimeFormatter` 65
• Using Predefined Formatters65
• Defining Custom Format Patterns67
• Locale-Specific Formatting70
• Thread Safety and Reusability72
Chapter 9: Clock and Instant 74
• Working with Instant74
• Using Clock for Testable Time76
• Converting Between Instant, LocalDateTime, and ZonedDateTime79
• Measuring Time Intervals83
Chapter 10: Legacy Date and Time API 85
• Overview of java.util.Date and java.util.Calendar85
• Problems with the Legacy API88
• Bridging Between Old and New APIs (toInstant() and Date.from())92
Chapter 11: Internationalization and Localization 96
• Localized Date and Time Formats96
• Using Locale with DateTimeFormatter99
• Formatting Dates for Different Regions102
Chapter 12: Working with Time Zones in Depth 104
• Exploring the ZoneRules API104
• Fixed Offset vs. Region-Based Zones107
• Keeping Time Zone Data Up to Date111
Chapter 13: Scheduling and Recurrence 113
• Modeling Recurring Events (e.g., "Every Monday")113
• Using ChronoUnit for Custom Intervals116
• Integration with Scheduling Frameworks119
Chapter 14: Serialization and Deserialization 122
• JSON Serialization with java.time122
• Using Jackson and Gson with Java Time124
• Binary Serialization Considerations128
Chapter 15: Multi-threaded and Concurrent Date-Time Handling 132
• Thread Safety of the java.time API132
• Designing Thread-Safe Date Utilities135
• Performance Tips for High-Load Systems138
Chapter 16: Building a Time Zone Converter 141
• User Input for Date, Time, and Zone141
• Converting Between Time Zones40
• Formatting Output for End Users147
Chapter 17: Implementing a Date Range Picker Backend 150
• Representing and Validating Date Ranges150
• Handling Open and Closed Ranges154
• Overlapping Ranges and Booking Conflicts158
Chapter 18: Logging and Timestamps 162
• Using Timestamps in Logs162
• Formatting Timestamps for Logs163
• Ensuring UTC Logging Across Systems165
Chapter 19: Time in REST APIs 167
• Designing APIs with ISO-8601 Support167
• Validating and Parsing Input Dates170
• Dealing with Time Zones in APIs173
Chapter 20: Testing with Time 176
• Faking the Current Time with Clock176
• Time-based Unit Tests and Assertions178
• Using Libraries like JUnit and Mockito with Clock181