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# Glib::Date Class Reference

Julian calendar date. More...

List of all members.

## Public Types

typedef guint8 | Day
typedef guint16 | Year
enum | Month { BAD_MONTH, JANUARY, FEBRUARY, MARCH, APRIL, MAY, JUNE, JULY, AUGUST, SEPTEMBER, OCTOBER, NOVEMBER, DECEMBER }
enum | Weekday { BAD_WEEKDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY }
enum | DMY { DAY, MONTH, YEAR }

## Public Member Functions

| Date ()
| Date (Day day, Month month, Year year)
| Date (guint32 julian_day)
void | clear ()
void | set_parse (const Glib::ustring& str)
| Parses a user-inputted string str, and try to figure out what date it represents, taking the current locale into account.
void | set_time (GTime time)
| Sets the value of a date from a GTime (time_t) value.
void | set_month (Month month)
| Sets the month of the year.
void | set_day (Day day)
| Sets the day of the month.
void | set_year (Year year)
| Sets the year.
void | set_dmy (Day day, Month month, Year year)
| Sets the value of a day, month, and year..
void | set_julian (guint32 julian_day)
| Sets the value of a GDate from a Julian day number.
Date& | add_days (int n_days)
| Add a number of days to a Date.
Date& | subtract_days (int n_days)
| Subtract n_days to a Date.
Date& | add_months (int n_months)
| Add n_months to a Date.
Date& | subtract_months (int n_months)
| Subtract n_months to a Date.
Date& | add_years (int n_years)
| Add n_days to a Date.
Date& | subtract_years (int n_years)
| Subtract n_years to a Date.
int | days_between (const Date& rhs) const
| Calculate days between two dates.
int | compare (const Date& rhs) const
| Compare two dates.
Date& | clamp (const Date& min_date, const Date& max_date)
| If date is prior to min_date, sets date equal to min_date.
Date& | clamp_min (const Date& min_date)
| If date is prior to min_date, sets date equal to min_date.
Date& | clamp_max (const Date& max_date)
| If date falls after max_date, sets date equal to max_date.
void | order (Date& other)
| Checks if date is less than or equal to other date, and swap the values if this is not the case.
Weekday | get_weekday () const
| Returns the day of the week for a Date.
Month | get_month () const
| Returns the month of the year.
Year | get_year () const
| Returns the year of a Date.
Day | get_day () const
| Returns the day of the month.
guint32 | get_julian () const
| Returns the Julian day or "serial number" of the Date.
unsigned int | get_day_of_year () const
| Returns the day of the year, where Jan 1 is the first day of the year.
unsigned int | get_monday_week_of_year () const
| Returns the week of the year, where weeks are understood to start on Monday.
unsigned int | get_sunday_week_of_year () const
| Returns the week of the year during which this date falls, if weeks are understood to being on Sunday.
bool | is_first_of_month () const
| Returns true if the date is on the first of a month.
bool | is_last_of_month () const
| Returns true if the date is the last day of the month.
Glib::ustring | format_string (const Glib::ustring& format) const
| Convert date to string.
void | to_struct_tm (struct tm& dest) const
| Fills in the date-related bits of a struct tm using the date value.
bool | valid () const
| Returns true if the Date represents an existing day.

## Static Public Member Functions

guint8 | get_days_in_month (Month month, Year year)
| Returns the number of days in a month, taking leap years into account.
guint8 | get_monday_weeks_in_year (Year year)
| Returns the number of weeks in the year, where weeks are taken to start on Monday.
guint8 | get_sunday_weeks_in_year (Year year)
| Returns the number of weeks in the year, where weeks are taken to start on Sunday.
bool | is_leap_year (Year year)
| Returns true if the year is a leap year.
bool | valid_day (Day day)
| Returns true if the day of the month is valid (a day is valid if it's between 1 and 31 inclusive).
bool | valid_month (Month month)
| Returns true if the month value is valid.
bool | valid_year (Year year)
| Returns true if the year is valid.
bool | valid_weekday (Weekday weekday)
| Returns true if the weekday is valid.
bool | valid_julian (guint32 julian_day)
| Returns true if the Julian day is valid.
bool | valid_dmy (Day day, Month month, Year year)
| Returns true if the day-month-year triplet forms a valid, existing day in the range of days Date understands (Year 1 or later, no more than a few thousand years in the future).

## Static Public Attributes

const Day | BAD_DAY = 0
const Year | BAD_YEAR = 0
const guint32 | BAD_JULIAN = 0

## Related Functions

(Note that these are not member functions.)
bool | operator== (const Date& lhs, const Date& rhs)
bool | operator!= (const Date& lhs, const Date& rhs)
bool | operator< (const Date& lhs, const Date& rhs)
bool | operator> (const Date& lhs, const Date& rhs)
bool | operator<= (const Date& lhs, const Date& rhs)
bool | operator>= (const Date& lhs, const Date& rhs)

## Detailed Description

Julian calendar date.

## Member Typedef Documentation

typedef guint8 Glib::Date::Day

typedef guint16 Glib::Date::Year

## Constructor & Destructor Documentation

Glib::Date::Date | ( |  | ) |

Glib::Date::Date | ( | Day | day,
|  | Month | month,
|  | Year | year
| ) |

Glib::Date::Date | ( | guint32 | julian_day | ) | `[explicit]`

## Member Function Documentation

Date& Glib::Date::add_days | ( | int | n_days | ) |

Add a number of days to a Date.

Parameters:

  | n_days | Days to add.

Returns:
  Resulting Date

Date& Glib::Date::add_months | ( | int | n_months | ) |

Add n_months to a Date.

Parameters:

  | n_months | Months to add.

Returns:
  Resulting Date

Date& Glib::Date::add_years | ( | int | n_years | ) |

Add n_days to a Date.

Parameters:

  | n_years | Years to add.

Returns:
  Resulting Date

Date& Glib::Date::clamp | ( | const Date& | min_date,
|  | const Date& | max_date
| ) |

If date is prior to min_date, sets date equal to min_date.

If date falls after max_date, sets date equal to max_date. All dates must be valid. See also clamp_min() and clamp_max().

Parameters:

  | min_date | Date minimum value.
  | max_date | Date maximum value.

Returns:
  Date in interval.

Date& Glib::Date::clamp_max | ( | const Date& | max_date | ) |

If date falls after max_date, sets date equal to max_date.

See also clamp(), and clamp_min().

Parameters:

  | min_date | Date minimum value.
  | max_date | Date maximum value.

Returns:
  Date in interval.

Date& Glib::Date::clamp_min | ( | const Date& | min_date | ) |

If date is prior to min_date, sets date equal to min_date.

See also clamp(), and clamp_max().

Parameters:

  | min_date | Date minimum value.
  | max_date | Date maximum value.

Returns:
  Date in interval.

void Glib::Date::clear | ( |  | ) |

int Glib::Date::compare | ( | const Date& | rhs | ) | const

Compare two dates.

Parameters:

  | rhs | Date to compare.

Returns:
  Result of comparition.

int Glib::Date::days_between | ( | const Date& | rhs | ) | const

Calculate days between two dates.

Parameters:

  | rhs | Date.

Returns:
  Numbers of days.

Glib::ustring Glib::Date::format_string | ( | const Glib::ustring& | format | ) | const

Convert date to string.

Parameters:

  | format | A format string as used by `strftime()`, in UTF-8 encoding. Only date formats are allowed, the result of time formats is undefined.

Returns:
  The formatted date string.

Exceptions:

  | Glib::ConvertError |

Day Glib::Date::get_day | ( |  | ) | const

Returns the day of the month.

The date must be valid.

Returns:
  Day of the month..

unsigned int Glib::Date::get_day_of_year | ( |  | ) | const

Returns the day of the year, where Jan 1 is the first day of the year.

The date must be valid.

Returns:
  Julian day.

guint8 Glib::Date::get_days_in_month | ( | Month | month,
|  | Year | year
| ) | `[static]`

Returns the number of days in a month, taking leap years into account.

Parameters:

  | month | Month.
  | year | Year.

Returns:
  Number of days in month during the year.

guint32 Glib::Date::get_julian | ( |  | ) | const

Returns the Julian day or "serial number" of the Date.

The Julian day is simply the number of days since January 1, Year 1; i.e., January 1, Year 1 is Julian day 1; January 2, Year 1 is Julian day 2, etc. The date must be valid.

Returns:
  Julian day.

unsigned int Glib::Date::get_monday_week_of_year | ( |  | ) | const

Returns the week of the year, where weeks are understood to start on Monday.

If the date is before the first Monday of the year, return 0. The date must be valid.

Returns:
  Week of the year.

guint8 Glib::Date::get_monday_weeks_in_year | ( | Year | year | ) | `[static]`

Returns the number of weeks in the year, where weeks are taken to start on Monday.

Will be 52 or 53. (Years always have 52 7-day periods, plus 1 or 2 extra days depending on whether it's a leap year. This function is basically telling you how many Mondays are in the year, i.e. there are 53 Mondays if one of the extra days happens to be a Monday.)

Parameters:

  | year | Year to count weeks in.

Returns:
  Number of weeks.

Month Glib::Date::get_month | ( |  | ) | const

Returns the month of the year.

The date must be valid.

Returns:
  Month of the year as a Date::Month.

unsigned int Glib::Date::get_sunday_week_of_year | ( |  | ) | const

Returns the week of the year during which this date falls, if weeks are understood to being on Sunday.

Can return 0 if the day is before the first Sunday of the year. The date must be valid.

Returns:
  Week of the year.

guint8 Glib::Date::get_sunday_weeks_in_year | ( | Year | year | ) | `[static]`

Returns the number of weeks in the year, where weeks are taken to start on Sunday.

Will be 52 or 53. (Years always have 52 7-day periods, plus 1 or 2 extra days depending on whether it's a leap year. This function is basically telling you how many Sundays are in the year, i.e. there are 53 Sundays if one of the extra days happens to be a Sunday.)

Parameters:

  | year | Year to count weeks in.

Returns:
  Number of weeks.

Weekday Glib::Date::get_weekday | ( |  | ) | const

Returns the day of the week for a Date.

The date must be valid.

Returns:
  Day of the week as a Date::Weekday.

Year Glib::Date::get_year | ( |  | ) | const

Returns the year of a Date.

The date must be valid.

Returns:
  Year in which the date falls.

bool Glib::Date::is_first_of_month | ( |  | ) | const

Returns true if the date is on the first of a month.

The date must be valid.

Returns:
  true if the date is the first of the month.

bool Glib::Date::is_last_of_month | ( |  | ) | const

Returns true if the date is the last day of the month.

The date must be valid.

Returns:
  true if the date is the last day of the month.

bool Glib::Date::is_leap_year | ( | Year | year | ) | `[static]`

Returns true if the year is a leap year.

Parameters:

  | year | Year to check.

Returns:
  true if the year is a leap year.

void Glib::Date::order | ( | Date& | other | ) |

Checks if date is less than or equal to other date, and swap the values if this is not the case.

Parameters:

  | other | Date ro compare.

Returns:
  Date.

void Glib::Date::set_day | ( | Day | day | ) |

Sets the day of the month.

If the resulting day-month-year triplet is invalid, the date will be invalid.

Parameters:

  | day | Day to set.

void Glib::Date::set_dmy | ( | Day | day,
|  | Month | month,
|  | Year | year
| ) |

Sets the value of a day, month, and year..

If the resulting day-month-year triplet is invalid, the date will be invalid.

Parameters:

  | day | Day to set.
  | month | Month to set.
  | year | Year to set.

void Glib::Date::set_julian | ( | guint32 | julian_day | ) |

Sets the value of a GDate from a Julian day number.

Parameters:

  | julian_day | Julian day to set.

void Glib::Date::set_month | ( | Month | month | ) |

Sets the month of the year.

If the resulting day-month-year triplet is invalid, the date will be invalid.

Parameters:

  | month | Month to set.

void Glib::Date::set_parse | ( | const Glib::ustring& | str | ) |

Parses a user-inputted string str, and try to figure out what date it represents, taking the current locale into account.

If the string is successfully parsed, the date will be valid after the call. Otherwise, it will be invalid. This function is not appropriate for file formats and the like; it isn't very precise, and its exact behavior varies with the locale. It's intended to be a heuristic routine that guesses what the user means by a given string (and it does work pretty well in that capacity).

Parameters:

  | str | String to parse.

void Glib::Date::set_time | ( | GTime | time | ) |

Sets the value of a date from a GTime (time_t) value.

To set the value of a date to the current day, you could write:

set_time(time(NULL));

Parameters:

  | time | GTime value to set.

void Glib::Date::set_year | ( | Year | year | ) |

Sets the year.

If the resulting day-month-year triplet is invalid, the date will be invalid.

Parameters:

  | year | Year to set.

Date& Glib::Date::subtract_days | ( | int | n_days | ) |

Subtract n_days to a Date.

Parameters:

  | n_days | Days to subtract.

Returns:
  Resulting Date

Date& Glib::Date::subtract_months | ( | int | n_months | ) |

Subtract n_months to a Date.

Parameters:

  | n_months | Months to subtract.

Returns:
  Resulting Date

Date& Glib::Date::subtract_years | ( | int | n_years | ) |

Subtract n_years to a Date.

Parameters:

  | n_years | Years to subtract.

Returns:
  Resulting Date

void Glib::Date::to_struct_tm | ( | struct tm& | dest | ) | const

Fills in the date-related bits of a struct tm using the date value.

Initializes the non-date parts with something sane but meaningless.

Parameters:

  | tm | Struct tm to fill.

bool Glib::Date::valid | ( |  | ) | const

Returns true if the Date represents an existing day.

Returns:
  true if the date is valid.

bool Glib::Date::valid_day | ( | Day | day | ) | `[static]`

Returns true if the day of the month is valid (a day is valid if it's between 1 and 31 inclusive).

Parameters:

  | day | Day to check.

Returns:
  true if the day is valid.

bool Glib::Date::valid_dmy | ( | Day | day,
|  | Month | month,
|  | Year | year
| ) | `[static]`

Returns true if the day-month-year triplet forms a valid, existing day in the range of days Date understands (Year 1 or later, no more than a few thousand years in the future).

Parameters:

  | day | Day to check.
  | month | Month to check.
  | year | Year to check.

Returns:
  true if the date is a valid one.

bool Glib::Date::valid_julian | ( | guint32 | julian_day | ) | `[static]`

Returns true if the Julian day is valid.

Anything greater than zero is basically a valid Julian, though there is a 32-bit limit.

Parameters:

  | julian_day | Julian day to check.

Returns:
  true if the Julian day is valid.

bool Glib::Date::valid_month | ( | Month | month | ) | `[static]`

Returns true if the month value is valid.

The 12 Date::Month enumeration values are the only valid months.

Parameters:

  | month | Month to check.

Returns:
  true if the month is valid.

bool Glib::Date::valid_weekday | ( | Weekday | weekday | ) | `[static]`

Returns true if the weekday is valid.

The 7 Date::Weekday enumeration values are the only valid.

Parameters:

  | weekday | Weekday to check.

Returns:
  true if the weekday is valid.

bool Glib::Date::valid_year | ( | Year | year | ) | `[static]`

Returns true if the year is valid.

Any year greater than 0 is valid, though there is a 16-bit limit to what Date will understand.

Parameters:

  | year | Year to check.

Returns:
  true if the year is valid.

## Friends And Related Function Documentation

bool operator!= | ( | const Date& | lhs,
|  | const Date& | rhs
| ) | `[related]`

bool operator< | ( | const Date& | lhs,
|  | const Date& | rhs
| ) | `[related]`

bool operator<= | ( | const Date& | lhs,
|  | const Date& | rhs
| ) | `[related]`

bool operator== | ( | const Date& | lhs,
|  | const Date& | rhs
| ) | `[related]`

bool operator> | ( | const Date& | lhs,
|  | const Date& | rhs
| ) | `[related]`

bool operator>= | ( | const Date& | lhs,
|  | const Date& | rhs
| ) | `[related]`

## Member Data Documentation

const Day Glib::Date::BAD_DAY = 0`[static]`

const guint32 Glib::Date::BAD_JULIAN = 0`[static]`

const Year Glib::Date::BAD_YEAR = 0`[static]`

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

- date.h