/*
 * This file is part of gtkD.
 *
 * gtkD is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version, with
 * some exceptions, please read the COPYING file.
 *
 * gtkD is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with gtkD; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
 */
 
// generated automatically - do not change
// find conversion definition on APILookup.txt
// implement new conversion functionalities on the wrap.utils pakage

/*
 * Conversion parameters:
 * inFile  = 
 * outPack = glib
 * outFile = Date
 * strct   = GDate
 * realStrct=
 * ctorStrct=
 * clss    = Date
 * interf  = 
 * class Code: Yes
 * interface Code: No
 * template for:
 * extend  = 
 * implements:
 * prefixes:
 * 	- g_date_
 * omit structs:
 * omit prefixes:
 * omit code:
 * omit signals:
 * imports:
 * 	- glib.Str
 * 	- gtkc.Loader
 * 	- gtkc.paths
 * structWrap:
 * 	- GDate* -> Date
 * module aliases:
 * local aliases:
 * overrides:
 */

module glib.Date;

public  import gtkc.glibtypes;

private import gtkc.glib;
private import glib.ConstructionException;


private import glib.Str;
private import gtkc.Loader;
private import gtkc.paths;




/**
 * The GDate data structure represents a day between January 1, Year 1,
 * and sometime a few thousand years in the future (right now it will go
 * to the year 65535 or so, but g_date_set_parse() only parses up to the
 * year 8000 or so - just count on "a few thousand"). GDate is meant to
 * represent everyday dates, not astronomical dates or historical dates
 * or ISO timestamps or the like. It extrapolates the current Gregorian
 * calendar forward and backward in time; there is no attempt to change
 * the calendar to match time periods or locations. GDate does not store
 * time information; it represents a day.
 *
 * The GDate implementation has several nice features; it is only a
 * 64-bit struct, so storing large numbers of dates is very efficient. It
 * can keep both a Julian and day-month-year representation of the date,
 * since some calculations are much easier with one representation or the
 * other. A Julian representation is simply a count of days since some
 * fixed day in the past; for GDate the fixed day is January 1, 1 AD.
 * ("Julian" dates in the GDate API aren't really Julian dates in the
 * technical sense; technically, Julian dates count from the start of the
 * Julian period, Jan 1, 4713 BC).
 *
 * GDate is simple to use. First you need a "blank" date; you can get a
 * dynamically allocated date from g_date_new(), or you can declare an
 * automatic variable or array and initialize it to a sane state by
 * calling g_date_clear(). A cleared date is sane; it's safe to call
 * g_date_set_dmy() and the other mutator functions to initialize the
 * value of a cleared date. However, a cleared date is initially
 * invalid, meaning that it doesn't represent a day
 * that exists. It is undefined to call any of the date calculation
 * routines on an invalid date. If you obtain a date from a user or other
 * unpredictable source, you should check its validity with the
 * g_date_valid() predicate. g_date_valid() is also used to check for
 * errors with g_date_set_parse() and other functions that can
 * fail. Dates can be invalidated by calling g_date_clear() again.
 *
 * It is very important to use the API to access the GDate
 * struct. Often only the day-month-year or only the Julian
 * representation is valid. Sometimes neither is valid. Use the API.
 *
 * GLib also features GDateTime which represents a precise time.
 */
public class Date
{
	
	/** the main Gtk struct */
	protected GDate* gDate;
	
	
	public GDate* getDateStruct()
	{
		return gDate;
	}
	
	
	/** the main Gtk struct as a void* */
	protected void* getStruct()
	{
		return cast(void*)gDate;
	}
	
	/**
	 * Sets our main struct and passes it to the parent class
	 */
	public this (GDate* gDate)
	{
		this.gDate = gDate;
	}
	
	~this ()
	{
		if ( Linker.isLoaded(LIBRARY.GLIB) && gDate !is null )
		{
			g_date_free(gDate);
		}
	}
	
	/**
	 */
	
	/**
	 * Allocates a GDate and initializes
	 * it to a sane state. The new date will
	 * be cleared (as if you'd called g_date_clear()) but invalid (it won't
	 * represent an existing day). Free the return value with g_date_free().
	 * Throws: ConstructionException GTK+ fails to create the object.
	 */
	public this ()
	{
		// GDate * g_date_new (void);
		auto p = g_date_new();
		if(p is null)
		{
			throw new ConstructionException("null returned by g_date_new()");
		}
		this(cast(GDate*) p);
	}
	
	/**
	 * Like g_date_new(), but also sets the value of the date. Assuming the
	 * day-month-year triplet you pass in represents an existing day, the
	 * returned date will be valid.
	 * Params:
	 * day = day of the month
	 * month = month of the year
	 * year = year
	 * Throws: ConstructionException GTK+ fails to create the object.
	 */
	public this (GDateDay day, GDateMonth month, GDateYear year)
	{
		// GDate * g_date_new_dmy (GDateDay day,  GDateMonth month,  GDateYear year);
		auto p = g_date_new_dmy(day, month, year);
		if(p is null)
		{
			throw new ConstructionException("null returned by g_date_new_dmy(day, month, year)");
		}
		this(cast(GDate*) p);
	}
	
	/**
	 * Like g_date_new(), but also sets the value of the date. Assuming the
	 * Julian day number you pass in is valid (greater than 0, less than an
	 * unreasonably large number), the returned date will be valid.
	 * Params:
	 * julianDay = days since January 1, Year 1
	 * Throws: ConstructionException GTK+ fails to create the object.
	 */
	public this (uint julianDay)
	{
		// GDate * g_date_new_julian (guint32 julian_day);
		auto p = g_date_new_julian(julianDay);
		if(p is null)
		{
			throw new ConstructionException("null returned by g_date_new_julian(julianDay)");
		}
		this(cast(GDate*) p);
	}
	
	/**
	 * Initializes one or more GDate structs to a sane but invalid
	 * state. The cleared dates will not represent an existing date, but will
	 * not contain garbage. Useful to init a date declared on the stack.
	 * Validity can be tested with g_date_valid().
	 * Params:
	 * nDates = number of dates to clear
	 */
	public void clear(uint nDates)
	{
		// void g_date_clear (GDate *date,  guint n_dates);
		g_date_clear(gDate, nDates);
	}
	
	/**
	 * Frees a GDate returned from g_date_new().
	 */
	public void free()
	{
		// void g_date_free (GDate *date);
		g_date_free(gDate);
	}
	
	/**
	 * Sets the day of the month for a GDate. If the resulting
	 * day-month-year triplet is invalid, the date will be invalid.
	 * Params:
	 * day = day to set
	 */
	public void setDay(GDateDay day)
	{
		// void g_date_set_day (GDate *date,  GDateDay day);
		g_date_set_day(gDate, day);
	}
	
	/**
	 * Sets the month of the year for a GDate. If the resulting
	 * day-month-year triplet is invalid, the date will be invalid.
	 * Params:
	 * month = month to set
	 */
	public void setMonth(GDateMonth month)
	{
		// void g_date_set_month (GDate *date,  GDateMonth month);
		g_date_set_month(gDate, month);
	}
	
	/**
	 * Sets the year for a GDate. If the resulting day-month-year
	 * triplet is invalid, the date will be invalid.
	 * Params:
	 * year = year to set
	 */
	public void setYear(GDateYear year)
	{
		// void g_date_set_year (GDate *date,  GDateYear year);
		g_date_set_year(gDate, year);
	}
	
	/**
	 * Sets the value of a GDate from a day, month, and year.
	 * The day-month-year triplet must be valid; if you aren't
	 * sure it is, call g_date_valid_dmy() to check before you
	 * set it.
	 * Params:
	 * day = day
	 * month = month
	 * y = year
	 */
	public void setDmy(GDateDay day, GDateMonth month, GDateYear y)
	{
		// void g_date_set_dmy (GDate *date,  GDateDay day,  GDateMonth month,  GDateYear y);
		g_date_set_dmy(gDate, day, month, y);
	}
	
	/**
	 * Sets the value of a GDate from a Julian day number.
	 * Params:
	 * julianDate = Julian day number (days since January 1, Year 1)
	 */
	public void setJulian(uint julianDate)
	{
		// void g_date_set_julian (GDate *date,  guint32 julian_date);
		g_date_set_julian(gDate, julianDate);
	}
	
	/**
	 * Warning
	 * g_date_set_time has been deprecated since version 2.10 and should not be used in newly-written code. Use g_date_set_time_t() instead.
	 * Sets the value of a date from a GTime value.
	 * The time to date conversion is done using the user's current timezone.
	 * Params:
	 * time = GTime value to set.
	 */
	public void setTime(GTime time)
	{
		// void g_date_set_time (GDate *date,  GTime time_);
		g_date_set_time(gDate, time);
	}
	
	/**
	 * Sets the value of a date to the date corresponding to a time
	 * specified as a time_t. The time to date conversion is done using
	 * the user's current timezone.
	 * Since 2.10
	 * Params:
	 * timet = time_t value to set
	 */
	public void setTimeT(uint timet)
	{
		// void g_date_set_time_t (GDate *date,  time_t timet);
		g_date_set_time_t(gDate, timet);
	}
	
	/**
	 * Sets the value of a date from a GTimeVal value. Note that the
	 * tv_usec member is ignored, because GDate can't make use of the
	 * additional precision.
	 * The time to date conversion is done using the user's current timezone.
	 * Since 2.10
	 * Params:
	 * timeval = GTimeVal value to set
	 */
	public void setTimeVal(ref GTimeVal timeval)
	{
		// void g_date_set_time_val (GDate *date,  GTimeVal *timeval);
		g_date_set_time_val(gDate, &timeval);
	}
	
	/**
	 * 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. You should check
	 * using g_date_valid() to see whether the parsing succeeded.
	 * 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).
	 * Params:
	 * str = string to parse
	 */
	public void setParse(string str)
	{
		// void g_date_set_parse (GDate *date,  const gchar *str);
		g_date_set_parse(gDate, Str.toStringz(str));
	}
	
	/**
	 * Increments a date some number of days.
	 * To move forward by weeks, add weeks*7 days.
	 * The date must be valid.
	 * Params:
	 * nDays = number of days to move the date forward
	 */
	public void addDays(uint nDays)
	{
		// void g_date_add_days (GDate *date,  guint n_days);
		g_date_add_days(gDate, nDays);
	}
	
	/**
	 * Moves a date some number of days into the past.
	 * To move by weeks, just move by weeks*7 days.
	 * The date must be valid.
	 * Params:
	 * nDays = number of days to move
	 */
	public void subtractDays(uint nDays)
	{
		// void g_date_subtract_days (GDate *date,  guint n_days);
		g_date_subtract_days(gDate, nDays);
	}
	
	/**
	 * Increments a date by some number of months.
	 * If the day of the month is greater than 28,
	 * this routine may change the day of the month
	 * (because the destination month may not have
	 * the current day in it). The date must be valid.
	 * Params:
	 * nMonths = number of months to move forward
	 */
	public void addMonths(uint nMonths)
	{
		// void g_date_add_months (GDate *date,  guint n_months);
		g_date_add_months(gDate, nMonths);
	}
	
	/**
	 * Moves a date some number of months into the past.
	 * If the current day of the month doesn't exist in
	 * the destination month, the day of the month
	 * may change. The date must be valid.
	 * Params:
	 * nMonths = number of months to move
	 */
	public void subtractMonths(uint nMonths)
	{
		// void g_date_subtract_months (GDate *date,  guint n_months);
		g_date_subtract_months(gDate, nMonths);
	}
	
	/**
	 * Increments a date by some number of years.
	 * If the date is February 29, and the destination
	 * year is not a leap year, the date will be changed
	 * to February 28. The date must be valid.
	 * Params:
	 * nYears = number of years to move forward
	 */
	public void addYears(uint nYears)
	{
		// void g_date_add_years (GDate *date,  guint n_years);
		g_date_add_years(gDate, nYears);
	}
	
	/**
	 * Moves a date some number of years into the past.
	 * If the current day doesn't exist in the destination
	 * year (i.e. it's February 29 and you move to a non-leap-year)
	 * then the day is changed to February 29. The date
	 * must be valid.
	 * Params:
	 * nYears = number of years to move
	 */
	public void subtractYears(uint nYears)
	{
		// void g_date_subtract_years (GDate *date,  guint n_years);
		g_date_subtract_years(gDate, nYears);
	}
	
	/**
	 * Computes the number of days between two dates.
	 * If date2 is prior to date1, the returned value is negative.
	 * Both dates must be valid.
	 * Params:
	 * date2 = the second date
	 * Returns: the number of days between date1 and date2
	 */
	public int daysBetween(Date date2)
	{
		// gint g_date_days_between (const GDate *date1,  const GDate *date2);
		return g_date_days_between(gDate, (date2 is null) ? null : date2.getDateStruct());
	}
	
	/**
	 * qsort()-style comparison function for dates.
	 * Both dates must be valid.
	 * Params:
	 * rhs = second date to compare
	 * Returns: 0 for equal, less than zero if lhs is less than rhs, greater than zero if lhs is greater than rhs
	 */
	public int compare(Date rhs)
	{
		// gint g_date_compare (const GDate *lhs,  const GDate *rhs);
		return g_date_compare(gDate, (rhs is null) ? null : rhs.getDateStruct());
	}
	
	/**
	 * 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.
	 * Otherwise, date is unchanged.
	 * Either of min_date and max_date may be NULL.
	 * All non-NULL dates must be valid.
	 * Params:
	 * minDate = minimum accepted value for date
	 * maxDate = maximum accepted value for date
	 */
	public void clamp(Date minDate, Date maxDate)
	{
		// void g_date_clamp (GDate *date,  const GDate *min_date,  const GDate *max_date);
		g_date_clamp(gDate, (minDate is null) ? null : minDate.getDateStruct(), (maxDate is null) ? null : maxDate.getDateStruct());
	}
	
	/**
	 * Checks if date1 is less than or equal to date2,
	 * and swap the values if this is not the case.
	 * Params:
	 * date2 = the second date
	 */
	public void order(Date date2)
	{
		// void g_date_order (GDate *date1,  GDate *date2);
		g_date_order(gDate, (date2 is null) ? null : date2.getDateStruct());
	}
	
	/**
	 * Returns the day of the month. The date must be valid.
	 * Returns: day of the month
	 */
	public GDateDay getDay()
	{
		// GDateDay g_date_get_day (const GDate *date);
		return g_date_get_day(gDate);
	}
	
	/**
	 * Returns the month of the year. The date must be valid.
	 * Returns: month of the year as a GDateMonth
	 */
	public GDateMonth getMonth()
	{
		// GDateMonth g_date_get_month (const GDate *date);
		return g_date_get_month(gDate);
	}
	
	/**
	 * Returns the year of a GDate. The date must be valid.
	 * Returns: year in which the date falls
	 */
	public GDateYear getYear()
	{
		// GDateYear g_date_get_year (const GDate *date);
		return g_date_get_year(gDate);
	}
	
	/**
	 * Returns the Julian day or "serial number" of the GDate. 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
	 */
	public uint getJulian()
	{
		// guint32 g_date_get_julian (const GDate *date);
		return g_date_get_julian(gDate);
	}
	
	/**
	 * Returns the day of the week for a GDate. The date must be valid.
	 * Returns: day of the week as a GDateWeekday.
	 */
	public GDateWeekday getWeekday()
	{
		// GDateWeekday g_date_get_weekday (const GDate *date);
		return g_date_get_weekday(gDate);
	}
	
	/**
	 * Returns the day of the year, where Jan 1 is the first day of the
	 * year. The date must be valid.
	 * Returns: day of the year
	 */
	public uint getDayOfYear()
	{
		// guint g_date_get_day_of_year (const GDate *date);
		return g_date_get_day_of_year(gDate);
	}
	
	/**
	 * Returns the number of days in a month, taking leap
	 * years into account.
	 * Params:
	 * month = month
	 * year = year
	 * Returns: number of days in month during the year
	 */
	public static ubyte getDaysInMonth(GDateMonth month, GDateYear year)
	{
		// guint8 g_date_get_days_in_month (GDateMonth month,  GDateYear year);
		return g_date_get_days_in_month(month, year);
	}
	
	/**
	 * 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
	 */
	public int isFirstOfMonth()
	{
		// gboolean g_date_is_first_of_month (const GDate *date);
		return g_date_is_first_of_month(gDate);
	}
	
	/**
	 * 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
	 */
	public int isLastOfMonth()
	{
		// gboolean g_date_is_last_of_month (const GDate *date);
		return g_date_is_last_of_month(gDate);
	}
	
	/**
	 * Returns TRUE if the year is a leap year.
	 * [5]
	 * Params:
	 * year = year to check
	 * Returns: TRUE if the year is a leap year
	 */
	public static int isLeapYear(GDateYear year)
	{
		// gboolean g_date_is_leap_year (GDateYear year);
		return g_date_is_leap_year(year);
	}
	
	/**
	 * 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
	 */
	public uint getMondayWeekOfYear()
	{
		// guint g_date_get_monday_week_of_year (const GDate *date);
		return g_date_get_monday_week_of_year(gDate);
	}
	
	/**
	 * Returns the number of weeks in the year, where weeks
	 * are taken to start on Monday. Will be 52 or 53. The
	 * date must be valid. (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.)
	 * Params:
	 * year = a year
	 * Returns: number of Mondays in the year
	 */
	public static ubyte getMondayWeeksInYear(GDateYear year)
	{
		// guint8 g_date_get_monday_weeks_in_year (GDateYear year);
		return g_date_get_monday_weeks_in_year(year);
	}
	
	/**
	 * Returns the week of the year during which this date falls, if weeks
	 * are understood to being on Sunday. The date must be valid. Can return
	 * 0 if the day is before the first Sunday of the year.
	 * Returns: week number
	 */
	public uint getSundayWeekOfYear()
	{
		// guint g_date_get_sunday_week_of_year (const GDate *date);
		return g_date_get_sunday_week_of_year(gDate);
	}
	
	/**
	 * Returns the number of weeks in the year, where weeks
	 * are taken to start on Sunday. Will be 52 or 53. The
	 * date must be valid. (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.)
	 * Params:
	 * year = year to count weeks in
	 * Returns: the number of weeks in year
	 */
	public static ubyte getSundayWeeksInYear(GDateYear year)
	{
		// guint8 g_date_get_sunday_weeks_in_year (GDateYear year);
		return g_date_get_sunday_weeks_in_year(year);
	}
	
	/**
	 * Returns the week of the year, where weeks are interpreted according
	 * to ISO 8601.
	 * Since 2.6
	 * Returns: ISO 8601 week number of the year.
	 */
	public uint getIso8601_WeekOfYear()
	{
		// guint g_date_get_iso8601_week_of_year (const GDate *date);
		return g_date_get_iso8601_week_of_year(gDate);
	}
	
	/**
	 * Generates a printed representation of the date, in a
	 * locale-specific way.
	 * Works just like the platform's C library strftime() function,
	 * but only accepts date-related formats; time-related formats
	 * give undefined results. Date must be valid. Unlike strftime()
	 * (which uses the locale encoding), works on a UTF-8 format
	 * string and stores a UTF-8 result.
	 * This function does not provide any conversion specifiers in
	 * addition to those implemented by the platform's C library.
	 * For example, don't expect that using g_date_strftime() would
	 * make the %F provided by the C99 strftime() work on Windows
	 * where the C library only complies to C89.
	 * Params:
	 * s = destination buffer
	 * format = format string
	 * date = valid GDate
	 * Returns: number of characters written to the buffer, or 0 the buffer was too small
	 */
	public static gsize strftime(char[] s, string format, Date date)
	{
		// gsize g_date_strftime (gchar *s,  gsize slen,  const gchar *format,  const GDate *date);
		return g_date_strftime(s.ptr, cast(int) s.length, Str.toStringz(format), (date is null) ? null : date.getDateStruct());
	}
	
	/**
	 * Fills in the date-related bits of a struct tm
	 * using the date value. Initializes the non-date parts with something
	 * sane but meaningless.
	 * Params:
	 * tm = struct tm to fill
	 */
	public void toStructTm(void* tm)
	{
		// void g_date_to_struct_tm (const GDate *date,  struct tm *tm);
		g_date_to_struct_tm(gDate, tm);
	}
	
	/**
	 * Returns TRUE if the GDate represents an existing day. The date must not
	 * contain garbage; it should have been initialized with g_date_clear()
	 * if it wasn't allocated by one of the g_date_new() variants.
	 * Returns: Whether the date is valid
	 */
	public int valid()
	{
		// gboolean g_date_valid (const GDate *date);
		return g_date_valid(gDate);
	}
	
	/**
	 * Returns TRUE if the day of the month is valid (a day is valid if it's
	 * between 1 and 31 inclusive).
	 * Params:
	 * day = day to check
	 * Returns: TRUE if the day is valid
	 */
	public static int validDay(GDateDay day)
	{
		// gboolean g_date_valid_day (GDateDay day);
		return g_date_valid_day(day);
	}
	
	/**
	 * Returns TRUE if the month value is valid. The 12 GDateMonth
	 * enumeration values are the only valid months.
	 * Params:
	 * month = month
	 * Returns: TRUE if the month is valid
	 */
	public static int validMonth(GDateMonth month)
	{
		// gboolean g_date_valid_month (GDateMonth month);
		return g_date_valid_month(month);
	}
	
	/**
	 * Returns TRUE if the year is valid. Any year greater than 0 is valid,
	 * though there is a 16-bit limit to what GDate will understand.
	 * Params:
	 * year = year
	 * Returns: TRUE if the year is valid
	 */
	public static int validYear(GDateYear year)
	{
		// gboolean g_date_valid_year (GDateYear year);
		return g_date_valid_year(year);
	}
	
	/**
	 * Returns TRUE if the day-month-year triplet forms a valid, existing day
	 * in the range of days GDate understands (Year 1 or later, no more than
	 * a few thousand years in the future).
	 * Params:
	 * day = day
	 * month = month
	 * year = year
	 * Returns: TRUE if the date is a valid one
	 */
	public static int validDmy(GDateDay day, GDateMonth month, GDateYear year)
	{
		// gboolean g_date_valid_dmy (GDateDay day,  GDateMonth month,  GDateYear year);
		return g_date_valid_dmy(day, month, year);
	}
	
	/**
	 * Returns TRUE if the Julian day is valid. Anything greater than zero
	 * is basically a valid Julian, though there is a 32-bit limit.
	 * Params:
	 * julianDate = Julian day to check
	 * Returns: TRUE if the Julian day is valid
	 */
	public static int validJulian(uint julianDate)
	{
		// gboolean g_date_valid_julian (guint32 julian_date);
		return g_date_valid_julian(julianDate);
	}
	
	/**
	 * Returns TRUE if the weekday is valid. The seven GDateWeekday enumeration
	 * values are the only valid weekdays.
	 * Params:
	 * weekday = weekday
	 * Returns: TRUE if the weekday is valid [5] For the purposes of this function, leap year is every year divisible by 4 unless that year is divisible by 100. If it is divisible by 100 it would be a leap year only if that year is also divisible by 400.
	 */
	public static int validWeekday(GDateWeekday weekday)
	{
		// gboolean g_date_valid_weekday (GDateWeekday weekday);
		return g_date_valid_weekday(weekday);
	}
}