ICU 75.1 75.1

Public Types | Public Member Functions | Static Public Member Functions
icu::DateTimeRule Class Reference

`DateTimeRule` is a class representing a time in a year by a rule specified by month, day of month, day of week and time in the day. More...

`#include <dtrule.h>`

Inheritance diagram for icu::DateTimeRule:

## Public Types
enum | DateRuleType { DOM = 0 , DOW , DOW_GEQ_DOM , DOW_LEQ_DOM }
| Date rule type constants. More...
enum | TimeRuleType { WALL_TIME = 0 , STANDARD_TIME , UTC_TIME }
| Time rule type constants. More...

## Public Member Functions
| DateTimeRule (int32_t month, int32_t dayOfMonth, int32_t millisInDay, TimeRuleType timeType)
| Constructs a `DateTimeRule` by the day of month and the time rule. More...
| DateTimeRule (int32_t month, int32_t weekInMonth, int32_t dayOfWeek, int32_t millisInDay, TimeRuleType timeType)
| Constructs a `DateTimeRule` by the day of week and its ordinal number and the time rule. More...
| DateTimeRule (int32_t month, int32_t dayOfMonth, int32_t dayOfWeek, UBool after, int32_t millisInDay, TimeRuleType timeType)
| Constructs a `DateTimeRule` by the first/last day of week on or after/before the day of month and the time rule. More...
| DateTimeRule (const DateTimeRule &source)
| Copy constructor. More...
| ~DateTimeRule ()
| Destructor. More...
DateTimeRule * | clone () const
| Clone this DateTimeRule object polymorphically. More...
DateTimeRule & | operator= (const DateTimeRule &right)
| Assignment operator. More...
bool | operator== (const DateTimeRule &that) const
| Return true if the given DateTimeRule objects are semantically equal. More...
bool | operator!= (const DateTimeRule &that) const
| Return true if the given DateTimeRule objects are semantically unequal. More...
DateRuleType | getDateRuleType () const
| Gets the date rule type, such as `DOM` More...
TimeRuleType | getTimeRuleType () const
| Gets the time rule type. More...
int32_t | getRuleMonth () const
| Gets the rule month. More...
int32_t | getRuleDayOfMonth () const
| Gets the rule day of month. More...
int32_t | getRuleDayOfWeek () const
| Gets the rule day of week. More...
int32_t | getRuleWeekInMonth () const
| Gets the ordinal number of the occurrence of the day of week in the month. More...
int32_t | getRuleMillisInDay () const
| Gets the rule time in the rule day. More...
virtual UClassID | getDynamicClassID () const override
| Returns a unique class ID POLYMORPHICALLY. More...
Public Member Functions inherited from icu::UObject
virtual | ~UObject ()
| Destructor. More...

## Static Public Member Functions
static UClassID | getStaticClassID ()
| Return the class ID for this class. More...

## Detailed Description

`DateTimeRule` is a class representing a time in a year by a rule specified by month, day of month, day of week and time in the day.

Stable:
  ICU 3.8

Definition at line 33 of file dtrule.h.

## Member Enumeration Documentation

## ◆ DateRuleType

enum icu::DateTimeRule::DateRuleType

Date rule type constants.

Stable:
  ICU 3.8

Enumerator
DOM | The exact day of month, for example, March 11.
DOW | The Nth occurrence of the day of week, for example, 2nd Sunday in March.
DOW_GEQ_DOM | The first occurrence of the day of week on or after the day of monnth, for example, first Sunday on or after March 8.
DOW_LEQ_DOM | The last occurrence of the day of week on or before the day of month, for example, first Sunday on or before March 14.

Definition at line 40 of file dtrule.h.

## ◆ TimeRuleType

enum icu::DateTimeRule::TimeRuleType

Time rule type constants.

Stable:
  ICU 3.8

Enumerator
WALL_TIME | The local wall clock time.
STANDARD_TIME | The local standard time.
UTC_TIME | The UTC time.

Definition at line 55 of file dtrule.h.

## Constructor & Destructor Documentation

## ◆ DateTimeRule() [1/4]

icu::DateTimeRule::DateTimeRule | ( | int32_t | month,
|  | int32_t | dayOfMonth,
|  | int32_t | millisInDay,
|  | TimeRuleType | timeType
| ) |  |

Constructs a `DateTimeRule` by the day of month and the time rule.

The date rule type for an instance created by this constructor is `DOM`.

Parameters

  month | The rule month, for example, `Calendar::JANUARY`
  dayOfMonth | The day of month, 1-based.
  millisInDay | The milliseconds in the rule date.
  timeType | The time type, `WALL_TIME` or `STANDARD_TIME` or `UTC_TIME`.

Stable:
  ICU 3.8

## ◆ DateTimeRule() [2/4]

icu::DateTimeRule::DateTimeRule | ( | int32_t | month,
|  | int32_t | weekInMonth,
|  | int32_t | dayOfWeek,
|  | int32_t | millisInDay,
|  | TimeRuleType | timeType
| ) |  |

Constructs a `DateTimeRule` by the day of week and its ordinal number and the time rule.

The date rule type for an instance created by this constructor is `DOW`.

Parameters

  month | The rule month, for example, `Calendar::JANUARY`.
  weekInMonth | The ordinal number of the day of week. Negative number may be used for specifying a rule date counted from the end of the rule month.
  dayOfWeek | The day of week, for example, `Calendar::SUNDAY`.
  millisInDay | The milliseconds in the rule date.
  timeType | The time type, `WALL_TIME` or `STANDARD_TIME` or `UTC_TIME`.

Stable:
  ICU 3.8

## ◆ DateTimeRule() [3/4]

icu::DateTimeRule::DateTimeRule | ( | int32_t | month,
|  | int32_t | dayOfMonth,
|  | int32_t | dayOfWeek,
|  | UBool | after,
|  | int32_t | millisInDay,
|  | TimeRuleType | timeType
| ) |  |

Constructs a `DateTimeRule` by the first/last day of week on or after/before the day of month and the time rule.

The date rule type for an instance created by this constructor is either `DOM_GEQ_DOM` or `DOM_LEQ_DOM`.

Parameters

  month | The rule month, for example, `Calendar::JANUARY`
  dayOfMonth | The day of month, 1-based.
  dayOfWeek | The day of week, for example, `Calendar::SUNDAY`.
  after | true if the rule date is on or after the day of month.
  millisInDay | The milliseconds in the rule date.
  timeType | The time type, `WALL_TIME` or `STANDARD_TIME` or `UTC_TIME`.

Stable:
  ICU 3.8

## ◆ DateTimeRule() [4/4]

icu::DateTimeRule::DateTimeRule | ( | const DateTimeRule & | source | ) |

Copy constructor.

Parameters

  source | The DateTimeRule object to be copied.

Stable:
  ICU 3.8

## ◆ ~DateTimeRule()

icu::DateTimeRule::~DateTimeRule | ( |  | ) |

Destructor.

Stable:
  ICU 3.8

## Member Function Documentation

## ◆ clone()

DateTimeRule* icu::DateTimeRule::clone | ( |  | ) | const

Clone this DateTimeRule object polymorphically.

The caller owns the result and should delete it when done.

Returns
  A copy of the object.

Stable:
  ICU 3.8

## ◆ getDateRuleType()

DateRuleType icu::DateTimeRule::getDateRuleType | ( |  | ) | const

Gets the date rule type, such as `DOM`

Returns
  The date rule type.

Stable:
  ICU 3.8

## ◆ getDynamicClassID()

virtual UClassID icu::DateTimeRule::getDynamicClassID | ( |  | ) | const
| override virtual

Returns a unique class ID POLYMORPHICALLY.

Pure virtual override. This method is to implement a simple version of RTTI, since not all C++ compilers support genuine RTTI. Polymorphic operator==() and clone() methods call this method.

Returns
  The class ID for this object. All objects of a given class have the same class ID. Objects of other classes have different class IDs.

Stable:
  ICU 3.8

Reimplemented from icu::UObject.

## ◆ getRuleDayOfMonth()

int32_t icu::DateTimeRule::getRuleDayOfMonth | ( |  | ) | const

Gets the rule day of month.

When the date rule type is `DOW`, the value is always 0.

Returns
  The rule day of month

Stable:
  ICU 3.8

## ◆ getRuleDayOfWeek()

int32_t icu::DateTimeRule::getRuleDayOfWeek | ( |  | ) | const

Gets the rule day of week.

When the date rule type is `DOM`, the value is always 0.

Returns
  The rule day of week.

Stable:
  ICU 3.8

## ◆ getRuleMillisInDay()

int32_t icu::DateTimeRule::getRuleMillisInDay | ( |  | ) | const

Gets the rule time in the rule day.

Returns
  The time in the rule day in milliseconds.

Stable:
  ICU 3.8

## ◆ getRuleMonth()

int32_t icu::DateTimeRule::getRuleMonth | ( |  | ) | const

Gets the rule month.

Returns
  The rule month.

Stable:
  ICU 3.8

## ◆ getRuleWeekInMonth()

int32_t icu::DateTimeRule::getRuleWeekInMonth | ( |  | ) | const

Gets the ordinal number of the occurrence of the day of week in the month.

When the date rule type is not `DOW`, the value is always 0.

Returns
  The rule day of week ordinal number in the month.

Stable:
  ICU 3.8

## ◆ getStaticClassID()

static UClassID icu::DateTimeRule::getStaticClassID | ( |  | ) |
| static

Return the class ID for this class.

This is useful only for comparing to a return value from getDynamicClassID(). For example:

    .   Base* polymorphic_pointer = createPolymorphicObject();
    .   if (polymorphic_pointer->getDynamicClassID() ==
    .       erived::getStaticClassID()) ...

Returns
  The class ID for all objects of this class.

Stable:
  ICU 3.8

## ◆ getTimeRuleType()

TimeRuleType icu::DateTimeRule::getTimeRuleType | ( |  | ) | const

Gets the time rule type.

Returns
  The time rule type, either `WALL_TIME` or `STANDARD_TIME` or `UTC_TIME`.

Stable:
  ICU 3.8

## ◆ operator!=()

bool icu::DateTimeRule::operator!= | ( | const DateTimeRule & | that | ) | const

Return true if the given DateTimeRule objects are semantically unequal.

Objects of different subclasses are considered unequal.

Parameters

  that | The object to be compared with.

Returns
  true if the given DateTimeRule objects are semantically unequal.

Stable:
  ICU 3.8

## ◆ operator=()

DateTimeRule& icu::DateTimeRule::operator= | ( | const DateTimeRule & | right | ) |

Assignment operator.

Parameters

  right | The object to be copied.

Stable:
  ICU 3.8

## ◆ operator==()

bool icu::DateTimeRule::operator== | ( | const DateTimeRule & | that | ) | const

Return true if the given DateTimeRule objects are semantically equal.

Objects of different subclasses are considered unequal.

Parameters

  that | The object to be compared with.

Returns
  true if the given DateTimeRule objects are semantically equal.

Stable:
  ICU 3.8

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

- i18n/unicode/dtrule.h