System time
A machine-provided or maintained representation of current time, commonly expressed as a calendar date and clock time.
Modern C, Third Edition
Calendar time is a representation of time organized for human interpretation as dates and clock times.
- How it is used
- Provides C interfaces for obtaining, comparing, converting, normalizing, and formatting human-oriented calendar times.
- How deep it goes
- Explains time_t, struct tm, member ranges, and mktime normalization, while leaving physical-time representation as a separate topic.
- Examples
- Uses time_t timestamps, difftime, struct tm fields, mktime normalization, and strftime format specifiers as concrete interfaces.
- What you can do after
- Apply it via C time.h interfaces to represent, compare, normalize, convert, and format calendar times.
Rust in Action: Systems programming concepts and techniques
System time is the time value maintained by an operating system for representing the current date and time.
- How it is used
- Uses the operating system’s current-time value to support applications that read, format, and timestamp events.
- How deep it goes
- Explains hardware sources, clock distinctions, adjustments, time zones, and a small Rust implementation without fully exposing library internals.
- Examples
- Demonstrates a Rust clock program, ISO 8601 output, Raspberry Pi boot behavior, and a network-independent wildlife sensor.
- What you can do after
- Apply system time through chrono to read, format, and print a time-zone-aware current timestamp.
Read how Rust in Action: Systems programming concepts and techniques explains system time →
Kafka Streams in Action, Second Edition
System time is the current wall-clock value maintained by the machine running a producer or broker.
- How it is used
- Schedules Kafka Streams punctuation independently of incoming-record timestamps and data flow.
- How deep it goes
- Explains wall-clock scheduling, polling-based granularity, best-effort timing, and its contrast with stream-time semantics.
- Examples
- Uses a stock-performance processor scheduled for approximately ten-second checks.
- What you can do after
- Operate Kafka Streams punctuation with PunctuationType.WALL_CLOCK_TIME when regular data-independent activity matters.
Read how Kafka Streams in Action, Second Edition explains system time →
Related concepts
- PunctuationType.WALL_CLOCK_TIMEused by · PunctuationType.WALL_CLOCK_TIME is a Kafka Streams scheduling mode that triggers punctuation according to the system clock of the Kafka Streams environment.
- time zoneuses · A time zone is a geographic or rule-defined region whose local civil time is determined by offsets and calendar-time rules relative to a reference time standard.
- time.hused by · time.h is the C standard header that declares facilities for representing, querying, and manipulating calendar and processor time.
- punctuationconfigures · A punctuation is a Kafka Streams processing-time callback or scheduling mechanism that triggers processor logic at a specified stream-time progression.
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