Cross-platform DateTime type with 100-nanosecond precision. More...

#include <nfx/datetime/DateTime.h>

Public Types
enum class	Format : std::uint8_t { Iso8601Basic , Iso8601Extended , Iso8601WithOffset , DateOnly , TimeOnly , UnixSeconds , UnixMilliseconds }
	DateTime string format options. More...

Public Member Functions
constexpr	DateTime () noexcept
	Default constructor (minimum DateTime value).
constexpr	DateTime (std::int64_t ticks) noexcept
	Construct from tick count (100-nanosecond units since year 1).
	DateTime (std::chrono::system_clock::time_point timePoint) noexcept
	Construct from system clock time point.
	DateTime (std::int32_t year, std::int32_t month, std::int32_t day) noexcept
	Construct from date components.
	DateTime (std::int32_t year, std::int32_t month, std::int32_t day, std::int32_t hour, std::int32_t minute, std::int32_t second) noexcept
	Construct from date and time components.
	DateTime (std::int32_t year, std::int32_t month, std::int32_t day, std::int32_t hour, std::int32_t minute, std::int32_t second, std::int32_t millisecond) noexcept
	Construct from date and time components with milliseconds.
	DateTime (std::string_view iso8601String)
	Parse from ISO 8601 string.
	DateTime (const DateTime &)=default
	Copy constructor.
	DateTime (DateTime &&) noexcept=default
	Move constructor.
	~DateTime ()=default
	Destructor.
DateTime &	operator= (const DateTime &)=default
	Copy assignment operator.
DateTime &	operator= (DateTime &&) noexcept=default
	Move assignment operator.
constexpr std::strong_ordering	operator<=> (const DateTime &other) const noexcept
	Three-way comparison operator.
constexpr bool	operator== (const DateTime &other) const noexcept
	Equality comparison.
constexpr DateTime	operator+ (const TimeSpan &duration) const noexcept
	Add time duration.
constexpr DateTime	operator- (const TimeSpan &duration) const noexcept
	Subtract time duration.
constexpr TimeSpan	operator- (const DateTime &other) const noexcept
	Get time difference between DateTimes.
constexpr DateTime &	operator+= (const TimeSpan &duration) noexcept
	Add time duration (in-place).
constexpr DateTime &	operator-= (const TimeSpan &duration) noexcept
	Subtract time duration (in-place).
std::int32_t	year () const noexcept
	Get year component (1-9999).
std::int32_t	month () const noexcept
	Get month component (1-12).
std::int32_t	day () const noexcept
	Get day component (1-31).
std::int32_t	hour () const noexcept
	Get hour component (0-23).
std::int32_t	minute () const noexcept
	Get minute component (0-59).
std::int32_t	second () const noexcept
	Get second component (0-59).
std::int32_t	millisecond () const noexcept
	Get millisecond component (0-999).
std::int32_t	microsecond () const noexcept
	Get microsecond component (0-999).
std::int32_t	nanosecond () const noexcept
	Get nanosecond component (0-900, in 100ns increments).
constexpr std::int64_t	ticks () const noexcept
	Get tick count (100-nanosecond units since year 1).
std::int32_t	dayOfWeek () const noexcept
	Get day of week (0=Sunday, 6=Saturday).
std::int32_t	dayOfYear () const noexcept
	Get day of year (1-366).
constexpr std::int64_t	toEpochSeconds () const noexcept
	Convert to Epoch timestamp (seconds since epoch).
constexpr std::int64_t	toEpochMilliseconds () const noexcept
	Convert to Epoch timestamp (milliseconds since epoch).
DateTime	date () const noexcept
	Get date component (time set to 00:00:00).
TimeSpan	timeOfDay () const noexcept
	Get time of day as duration since midnight.
bool	isValid () const noexcept
	Check if this DateTime is valid.
std::string	toString () const
	Convert to ISO 8601 string (basic format).
std::string	toString (Format format) const
	Convert to string using specified format.
std::string	toIso8601Extended () const
	Convert to ISO 8601 extended format with full precision.
std::chrono::system_clock::time_point	toChrono () const noexcept
	Convert to std::chrono::system_clock::time_point.

Static Public Member Functions
static constexpr bool	isLeapYear (std::int32_t year) noexcept
	Check if given year is a leap year.
static constexpr std::int32_t	daysInMonth (std::int32_t year, std::int32_t month) noexcept
	Get days in month for given year and month.
static DateTime	now () noexcept
	Get current local time.
static DateTime	utcNow () noexcept
	Get current UTC time.
static DateTime	today () noexcept
	Get current local date (time set to 00:00:00).
static constexpr DateTime	min () noexcept
	Get minimum DateTime value.
static constexpr DateTime	max () noexcept
	Get maximum DateTime value.
static constexpr DateTime	epoch () noexcept
	Get Unix epoch DateTime (January 1, 1970 00:00:00 UTC).
static bool	fromString (std::string_view iso8601String, DateTime &result) noexcept
	Parse ISO 8601 string safely without throwing exceptions.
static std::optional< DateTime >	fromString (std::string_view iso8601String) noexcept
	Parse ISO 8601 string and return optional DateTime.
static constexpr DateTime	fromEpochSeconds (std::int64_t seconds) noexcept
	Create from Epoch timestamp (seconds since epoch).
static constexpr DateTime	fromEpochMilliseconds (std::int64_t milliseconds) noexcept
	Create from Epoch timestamp (milliseconds since epoch).
static DateTime	fromChrono (const std::chrono::system_clock::time_point &timePoint) noexcept
	Create DateTime from std::chrono::system_clock::time_point.

Detailed Description

Cross-platform DateTime type with 100-nanosecond precision.

Implements datetime operations with:

100-nanosecond tick precision (10 million ticks per second)
Range: January 1, 0001 to December 31, 9999
ISO 8601 string parsing and formatting
System clock interoperability
Arithmetic operations with time intervals
Support for both UTC and local time representations

Note: DateTime doesn't store timezone information. For explicit timezone offset tracking, use DateTimeOffset instead.

Definition at line 223 of file datetime/DateTime.h.

Member Enumeration Documentation

◆ Format

enum class nfx::time::DateTime::Format : std::uint8_t

strong

DateTime string format options.

Provides type-safe format selection with self-documenting format names

Enumerator
Iso8601Basic	ISO 8601 basic format: "2024-01-01T12:00:00Z".
Iso8601Extended	ISO 8601 extended format with fractional seconds: "2024-01-01T12:00:00.1234567Z".
Iso8601WithOffset	Date and time with timezone: "2024-01-01T12:00:00+02:00".
DateOnly	Date only format: "2024-01-01".
TimeOnly	Time only: "12:00:00".
UnixSeconds	Epoch timestamp format: "1704110400" (seconds since epoch).
UnixMilliseconds	Epoch timestamp with milliseconds: "1704110400123".

Definition at line 234 of file datetime/DateTime.h.

Constructor & Destructor Documentation

◆ DateTime() [1/6]

nfx::time::DateTime::DateTime ( std::int64_t ticks )

inlineexplicitconstexprnoexcept

Construct from tick count (100-nanosecond units since year 1).

Parameters

ticks Number of 100-nanosecond intervals since January 1, 0001 UTC

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◆ DateTime() [2/6]

nfx::time::DateTime::DateTime ( std::chrono::system_clock::time_point timePoint )

inlineexplicitnoexcept

Construct from system clock time point.

Parameters

timePoint System clock time point to convert from

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◆ DateTime() [3/6]

nfx::time::DateTime::DateTime	(	std::int32_t	year,
		std::int32_t	month,
		std::int32_t	day )

noexcept

Construct from date components.

Parameters

year	Year component (1-9999)
month	Month component (1-12)
day	Day component (1-31)

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◆ DateTime() [4/6]

nfx::time::DateTime::DateTime	(	std::int32_t	year,
		std::int32_t	month,
		std::int32_t	day,
		std::int32_t	hour,
		std::int32_t	minute,
		std::int32_t	second )

noexcept

Construct from date and time components.

Parameters

year	Year component (1-9999)
month	Month component (1-12)
day	Day component (1-31)
hour	Hour component (0-23)
minute	Minute component (0-59)
second	Second component (0-59)

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◆ DateTime() [5/6]

nfx::time::DateTime::DateTime	(	std::int32_t	year,
		std::int32_t	month,
		std::int32_t	day,
		std::int32_t	hour,
		std::int32_t	minute,
		std::int32_t	second,
		std::int32_t	millisecond )

noexcept

Construct from date and time components with milliseconds.

Parameters

year	Year component (1-9999)
month	Month component (1-12)
day	Day component (1-31)
hour	Hour component (0-23)
minute	Minute component (0-59)
second	Second component (0-59)
millisecond	Millisecond component (0-999)

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◆ DateTime() [6/6]

nfx::time::DateTime::DateTime ( std::string_view iso8601String )

inlineexplicit

Parse from ISO 8601 string.

Parameters

iso8601String ISO 8601 formatted string to parse

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Member Function Documentation

◆ date()

DateTime nfx::time::DateTime::date ( ) const

nodiscardnoexcept

Get date component (time set to 00:00:00).

Returns: New DateTime with the same date but time set to 00:00:00

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ day()

std::int32_t nfx::time::DateTime::day ( ) const

nodiscardnoexcept

Get day component (1-31).

Returns: The day component of this DateTime (1-31)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ dayOfWeek()

std::int32_t nfx::time::DateTime::dayOfWeek ( ) const

nodiscardnoexcept

Get day of week (0=Sunday, 6=Saturday).

Returns: The day of week as an integer (0=Sunday, 1=Monday, ..., 6=Saturday)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ dayOfYear()

std::int32_t nfx::time::DateTime::dayOfYear ( ) const

nodiscardnoexcept

Get day of year (1-366).

Returns: The day of year as an integer (1-366, where 366 occurs in leap years)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ daysInMonth()

constexpr std::int32_t nfx::time::DateTime::daysInMonth	(	std::int32_t	year,
		std::int32_t	month )

inlinestaticnodiscardconstexprnoexcept

Get days in month for given year and month.

Parameters

year	The year to check (1-9999)
month	The month to check (1-12)

Returns: Number of days in the specified month (28-31)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ epoch()

constexpr DateTime nfx::time::DateTime::epoch ( )

inlinestaticnodiscardconstexprnoexcept

Get Unix epoch DateTime (January 1, 1970 00:00:00 UTC).

Returns: DateTime representing the Unix epoch (January 1, 1970 00:00:00 UTC)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ fromChrono()

DateTime nfx::time::DateTime::fromChrono ( const std::chrono::system_clock::time_point & timePoint )

staticnodiscardnoexcept

Create DateTime from std::chrono::system_clock::time_point.

Values outside the representable range of DateTime will be clamped to the nearest valid DateTime value.

Parameters

timePoint The system_clock time point to convert

Returns: A DateTime representing the same instant in time

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ fromEpochMilliseconds()

constexpr DateTime nfx::time::DateTime::fromEpochMilliseconds ( std::int64_t milliseconds )

inlinestaticnodiscardconstexprnoexcept

Create from Epoch timestamp (milliseconds since epoch).

Parameters

milliseconds The number of milliseconds since Unix epoch (January 1, 1970 00:00:00 UTC)

Returns: DateTime representing the specified Epoch timestamp in milliseconds

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ fromEpochSeconds()

constexpr DateTime nfx::time::DateTime::fromEpochSeconds ( std::int64_t seconds )

inlinestaticnodiscardconstexprnoexcept

Create from Epoch timestamp (seconds since epoch).

Parameters

seconds The number of seconds since Unix epoch (January 1, 1970 00:00:00 UTC)

Returns: DateTime representing the specified Epoch timestamp

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ fromString() [1/2]

std::optional< DateTime > nfx::time::DateTime::fromString ( std::string_view iso8601String )

staticnodiscardnoexcept

Parse ISO 8601 string and return optional DateTime.

Parameters

iso8601String The ISO 8601 formatted string to parse

Returns: std::optional<DateTime> containing the parsed value if successful, std::nullopt otherwise

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ fromString() [2/2]

bool nfx::time::DateTime::fromString	(	std::string_view	iso8601String,
		DateTime &	result )

staticnodiscardnoexcept

Parse ISO 8601 string safely without throwing exceptions.

Parameters

iso8601String	The ISO 8601 formatted string to parse
result	Reference to store the parsed DateTime if successful

Returns: true if parsing succeeded, false otherwise

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ hour()

std::int32_t nfx::time::DateTime::hour ( ) const

nodiscardnoexcept

Get hour component (0-23).

Returns: The hour component of this DateTime (0-23)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ isLeapYear()

constexpr bool nfx::time::DateTime::isLeapYear ( std::int32_t year )

inlinestaticnodiscardconstexprnoexcept

Check if given year is a leap year.

Parameters

year	The year to check for leap year status

Returns: true if the year is a leap year, false otherwise

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ isValid()

bool nfx::time::DateTime::isValid ( ) const

nodiscardnoexcept

Check if this DateTime is valid.

Returns: true if this DateTime represents a valid date and time, false otherwise

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ max()

constexpr DateTime nfx::time::DateTime::max ( )

inlinestaticnodiscardconstexprnoexcept

Get maximum DateTime value.

Returns: DateTime representing the maximum representable date (December 31, 9999 23:59:59.9999999 UTC)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ microsecond()

std::int32_t nfx::time::DateTime::microsecond ( ) const

nodiscardnoexcept

Get microsecond component (0-999).

Returns: The microsecond component of this DateTime (0-999)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ millisecond()

std::int32_t nfx::time::DateTime::millisecond ( ) const

nodiscardnoexcept

Get millisecond component (0-999).

Returns: The millisecond component of this DateTime (0-999)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ min()

constexpr DateTime nfx::time::DateTime::min ( )

inlinestaticnodiscardconstexprnoexcept

Get minimum DateTime value.

Returns: DateTime representing the minimum representable date (January 1, 0001 00:00:00.0000000 UTC)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ minute()

std::int32_t nfx::time::DateTime::minute ( ) const

nodiscardnoexcept

Get minute component (0-59).

Returns: The minute component of this DateTime (0-59)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ month()

std::int32_t nfx::time::DateTime::month ( ) const

nodiscardnoexcept

Get month component (1-12).

Returns: The month component of this DateTime (1-12)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ nanosecond()

std::int32_t nfx::time::DateTime::nanosecond ( ) const

nodiscardnoexcept

Get nanosecond component (0-900, in 100ns increments).

Returns: The nanosecond component of this DateTime (0, 100, 200, ..., 900)

Note: This function is marked [[nodiscard]] - the return value should not be ignored; Due to 100-nanosecond tick precision, only values 0-900 in 100ns increments are possible

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◆ now()

DateTime nfx::time::DateTime::now ( )

staticnodiscardnoexcept

Get current local time.

Returns: DateTime representing the current local date and time (system timezone)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ operator+()

DateTime nfx::time::DateTime::operator+ ( const TimeSpan & duration ) const

inlineconstexprnoexcept

Add time duration.

Parameters

duration The TimeSpan to add to this DateTime

Returns: New DateTime representing this DateTime plus the duration

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◆ operator+=()

DateTime & nfx::time::DateTime::operator+= ( const TimeSpan & duration )

inlineconstexprnoexcept

Add time duration (in-place).

Parameters

duration The TimeSpan to add to this DateTime

Returns: Reference to this DateTime after adding the duration

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◆ operator-() [1/2]

TimeSpan nfx::time::DateTime::operator- ( const DateTime & other ) const

inlineconstexprnoexcept

Get time difference between DateTimes.

Parameters

other The DateTime to subtract from this DateTime

Returns: TimeSpan representing the difference (this - other)

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◆ operator-() [2/2]

DateTime nfx::time::DateTime::operator- ( const TimeSpan & duration ) const

inlineconstexprnoexcept

Subtract time duration.

Parameters

duration The TimeSpan to subtract from this DateTime

Returns: New DateTime representing this DateTime minus the duration

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◆ operator-=()

DateTime & nfx::time::DateTime::operator-= ( const TimeSpan & duration )

inlineconstexprnoexcept

Subtract time duration (in-place).

Parameters

duration The TimeSpan to subtract from this DateTime

Returns: Reference to this DateTime after subtracting the duration

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◆ operator<=>()

std::strong_ordering nfx::time::DateTime::operator<=> ( const DateTime & other ) const

inlineconstexprnoexcept

Three-way comparison operator.

Parameters

other The DateTime to compare with

Returns: std::strong_ordering indicating the relative order of the two DateTimes

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◆ operator=() [1/2]

DateTime & nfx::time::DateTime::operator= ( const DateTime & )

default

Copy assignment operator.

Returns: Reference to this DateTime after assignment

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◆ operator=() [2/2]

DateTime & nfx::time::DateTime::operator= ( DateTime && )

defaultnoexcept

Move assignment operator.

Returns: Reference to this DateTime after assignment

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◆ operator==()

bool nfx::time::DateTime::operator== ( const DateTime & other ) const

inlineconstexprnoexcept

Equality comparison.

Parameters

other The DateTime to compare with

Returns: true if both DateTimes represent the same instant, false otherwise

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◆ second()

std::int32_t nfx::time::DateTime::second ( ) const

nodiscardnoexcept

Get second component (0-59).

Returns: The second component of this DateTime (0-59)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ ticks()

std::int64_t nfx::time::DateTime::ticks ( ) const

nodiscardconstexprnoexcept

Get tick count (100-nanosecond units since year 1).

Returns: The number of 100-nanosecond intervals since January 1, 0001 UTC

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ timeOfDay()

TimeSpan nfx::time::DateTime::timeOfDay ( ) const

nodiscardnoexcept

Get time of day as duration since midnight.

Returns: TimeSpan representing the elapsed time since midnight (00:00:00)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ toChrono()

std::chrono::system_clock::time_point nfx::time::DateTime::toChrono ( ) const

nodiscardnoexcept

Convert to std::chrono::system_clock::time_point.

Values outside the representable range of std::chrono::system_clock (approximately years 1677-2262 on 64-bit Linux systems) will be clamped to the nearest representable value. This means extreme dates (near year 1 or year 9999) cannot round-trip through chrono.

Returns: A system_clock::time_point representing this DateTime

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ today()

DateTime nfx::time::DateTime::today ( )

staticnodiscardnoexcept

Get current local date (time set to 00:00:00).

Returns: DateTime representing the current local date with time set to 00:00:00

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ toEpochMilliseconds()

std::int64_t nfx::time::DateTime::toEpochMilliseconds ( ) const

inlinenodiscardconstexprnoexcept

Convert to Epoch timestamp (milliseconds since epoch).

Returns: Number of milliseconds since Unix epoch (January 1, 1970 00:00:00 UTC)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ toEpochSeconds()

std::int64_t nfx::time::DateTime::toEpochSeconds ( ) const

inlinenodiscardconstexprnoexcept

Convert to Epoch timestamp (seconds since epoch).

Returns: Number of seconds since Unix epoch (January 1, 1970 00:00:00 UTC)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ toIso8601Extended()

std::string nfx::time::DateTime::toIso8601Extended ( ) const

nodiscard

Convert to ISO 8601 extended format with full precision.

Returns: String representation in ISO 8601 extended format with fractional seconds (e.g., "2024-01-01T12:00:00.1234567Z")

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ toString() [1/2]

std::string nfx::time::DateTime::toString ( ) const

nodiscard

Convert to ISO 8601 string (basic format).

Returns: String representation in ISO 8601 basic format (e.g., "2024-01-01T12:00:00Z")

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ toString() [2/2]

std::string nfx::time::DateTime::toString ( Format format ) const

nodiscard

Convert to string using specified format.

Parameters

format The format to use for string conversion

Returns: String representation using the specified format

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ utcNow()

DateTime nfx::time::DateTime::utcNow ( )

staticnodiscardnoexcept

Get current UTC time.

Returns: DateTime representing the current UTC date and time

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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◆ year()

std::int32_t nfx::time::DateTime::year ( ) const

nodiscardnoexcept

Get year component (1-9999).

Returns: The year component of this DateTime (1-9999)

Note: This function is marked [[nodiscard]] - the return value should not be ignored

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The documentation for this class was generated from the following file:

datetime/DateTime.h

Public Types

Public Member Functions

Static Public Member Functions

Detailed Description

Member Enumeration Documentation

◆ Format

Constructor & Destructor Documentation

◆ DateTime() [1/6]

◆ DateTime() [2/6]

◆ DateTime() [3/6]

◆ DateTime() [4/6]

◆ DateTime() [5/6]

◆ DateTime() [6/6]

Member Function Documentation

◆ date()

◆ day()

◆ dayOfWeek()

◆ dayOfYear()

◆ daysInMonth()

◆ epoch()

◆ fromChrono()

◆ fromEpochMilliseconds()

◆ fromEpochSeconds()

◆ fromString() [1/2]

◆ fromString() [2/2]

◆ hour()

◆ isLeapYear()

◆ isValid()

◆ max()

◆ microsecond()

◆ millisecond()

◆ min()

◆ minute()

◆ month()

◆ nanosecond()

◆ now()

◆ operator+()

◆ operator+=()

◆ operator-() [1/2]

◆ operator-() [2/2]

◆ operator-=()

◆ operator<=>()

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ operator==()

◆ second()

◆ ticks()

◆ timeOfDay()

◆ toChrono()

◆ today()

◆ toEpochMilliseconds()

◆ toEpochSeconds()

◆ toIso8601Extended()

◆ toString() [1/2]

◆ toString() [2/2]

◆ utcNow()

◆ year()