nfx-datetime 0.6.0
Cross-platform C++ DateTime library with 100-nanosecond precision and ISO 8601 support
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Changelog

[Unreleased]

Added

  • NIL

Changed

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Deprecated

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Removed

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Fixed

  • NIL

Security

  • NIL

[0.6.0] - 2026-02-15

Added

  • NFX_DATETIME_ENABLE_SIMD build option to enable/disable native CPU optimizations (enabled by default)
  • SIMD optimization support (AVX2 for MSVC, -march=native for GCC/Clang) for Release builds
  • WebAssembly/Emscripten compilation support with automatic fallback to portable implementations
  • Emscripten-specific optimizations (microsecond-based chrono conversion, std::strtod parsing)

Changed

  • Bumped nfx-stringbuilder dependency from 0.6.2 to 0.7.0
  • Simplified release workflow (removed complex packaging steps)
  • SIMD settings now propagate to nfx-stringbuilder dependency
  • Use std::strtod instead of std::from_chars for floating-point parsing under Emscripten

[0.5.0] - 2026-02-14

Added

  • Strict compiler warning options (/W4 /WX for MSVC, -Wall -Wextra -Werror for GCC/Clang)

Changed

  • Bumped nfx-stringbuilder dependency from 0.6.0 to 0.6.2
  • Updated static library output name to remove version suffix

Fixed

  • Fixed implicit conversion warnings by adding explicit casts from int64_t to double in timezone offset calculations
  • Fixed potential undefined behavior in date calculations by clamping month value to valid range (1-12)
  • Fixed implicit conversion in test assertions by casting ticks() to double for accurate comparisons

[0.4.2] - 2026-02-11

  • bump nfx-stringbuilder from 0.5.0 to 0.6.0

[0.4.1] - 2026-02-03

Fixed

  • Refactored DateTime::toString() to reduce code duplication by extracting helper functions for common formatting patterns
  • Fixed warnings for unused local variables in DateTime::toString() and DateTimeOffset formatting functions

[0.4.0] - 2026-02-03

Added

  • nfx-stringbuilder dependency (v0.5.0) for high-performance string building
  • Fast-path parsing optimizations for common ISO 8601 formats

Changed

  • TimeSpan::toString() now uses nfx::StringBuilder instead of std::ostringstream
  • DateTimeOffset::toString() now uses nfx::StringBuilder instead of std::ostringstream
  • DateTime::toString() now uses nfx::StringBuilder instead of std::ostringstream
  • Updated Google Benchmark dependency from 1.9.4 to 1.9.5

[0.3.0] - 2026-01-11

Added

  • C-string constructors for DateTime and DateTimeOffset for convenient initialization from string literals
  • std::initializer_list<const char*> constructors for DateTime and DateTimeOffset for single-string initialization syntax
  • DateTime::Format::Iso8601PreciseTrimmed format option that removes trailing zeros from fractional seconds (e.g., .1230000Z → .123Z, .1000000Z → .1Z) while maintaining full ISO 8601:2019 §5.3.4.2 compliance
  • DateTime::Format::Iso8601Millis format option for fixed 3-digit millisecond precision (e.g., .123Z, .000Z)
  • DateTime::Format::Iso8601Micros format option for fixed 6-digit microsecond precision (e.g., .123456Z, .000000Z)

Changed

  • BREAKING: DateTime::Format enum values renamed (Iso8601WithOffset → Iso8601Extended, Iso8601Compact → Iso8601Basic) to align with ISO 8601 terminology

[0.2.0] - 2026-01-05

Changed

  • BREAKING: DateTime::Format enum renamed (Iso8601Basic → Iso8601, Iso8601Extended → Iso8601Precise, DateOnly → Iso8601Date, TimeOnly → Iso8601Time)
  • BREAKING: Fractional seconds always display exactly 7 digits (tick precision) in Iso8601Precise format
  • BREAKING: DateTimeOffset offset always explicit (±HH:MM), removed Z notation for UTC
  • BREAKING: toString() consolidated to single method with default parameter

Removed

  • BREAKING: Standalone toIso8601Extended() method (use toString(Format::Iso8601Precise))

[0.1.1] - 2025-11-27

Changed

  • Consolidated packaging tool detection in CMake configuration

Fixed

  • Removed incorrect runtime dependencies from DEB/RPM packages

[0.1.0] - 2025-11-17 - Initial Release

Added

  • DateTime: UTC-based date and time representation
    • 100-nanosecond precision (10 million ticks per second)
    • Range: January 1, 0001 to December 31, 9999
    • Complete arithmetic operators (+, -, comparisons)
    • Factory methods (now(), today(), min(), max(), epoch(), fromEpochSeconds(), fromEpochMilliseconds())
    • Component accessors (year(), month(), day(), hour(), minute(), second(), millisecond(), microsecond(), nanosecond(), dayOfWeek(), dayOfYear())
    • ISO 8601 parsing and formatting (fromString(), toString(), toIso8601Extended())
    • Epoch timestamp conversion (toEpochSeconds(), toEpochMilliseconds())
    • Date/time manipulation (date(), timeOfDay())
    • std::chrono interoperability (toChrono(), fromChrono())
  • DateTimeOffset: Timezone-aware date and time representation
    • All DateTime features plus timezone offset support
    • Offset range: -14:00 to +14:00
    • Component accessors (year(), month(), day(), hour(), minute(), second(), millisecond(), microsecond(), nanosecond(), dayOfWeek(), dayOfYear())
    • Timezone conversion (toOffset(), toUniversalTime(), toLocalTime())
    • ISO 8601 parsing and formatting with timezone (fromString(), toString(), toIso8601Extended())
    • UTC and local time accessors (utcDateTime(), localDateTime(), utcTicks())
    • Factory methods (now(), utcNow(), today(), fromEpochSeconds(), fromEpochMilliseconds(), fromFILETIME())
    • Date/time arithmetic (add(), addDays(), addHours(), addMinutes(), addSeconds(), addMonths(), addYears())
    • Windows FILETIME conversion support
  • TimeSpan: Duration and time interval representation
    • 100-nanosecond precision matching DateTime
    • Range: -10,675,199 days to +10,675,199 days
    • Complete arithmetic operators (+, -, +=, -=, unary -, *, /, comparisons)
    • User-defined literals for natural C++ syntax (_d, _h, _min, _s, _ms, _us, _ns)
    • Compile-time evaluation with constexpr literals
    • Factory methods (fromDays(), fromHours(), fromMinutes(), fromSeconds(), fromMilliseconds(), fromMicroseconds(), fromTicks())
    • Total value accessors (days(), hours(), minutes(), seconds(), milliseconds(), microseconds(), nanoseconds())
    • Tick count accessor (ticks())
    • ISO 8601 duration parsing and formatting (fromString(), toString())
    • Duration calculations and comparisons
    • std::chrono::duration interoperability (toChrono(), fromChrono())
    • Proper rounding to 100ns tick precision for sub-tick values
  • Documentation
    • README with feature overview
    • Detailed API documentation with Doxygen comments
    • Sample application demonstrating library usage
    • Build and installation instructions
  • Testing & Benchmarking
    • Unit test suite
    • Performance benchmarks for all operations
    • Cross-compiler performance validation