106 #define kJan1_1JulianDay  1721426 // January 1, year 1 (Gregorian)
151      * Return TRUE if the given year is a leap year.
152      * @param year Gregorian year, with 0 == 1 BCE, -1 == 2 BCE, etc.
153      * @return TRUE if the year is a leap year
155     static inline UBool isLeapYear(int32_t year);
159      * @param year Gregorian year, with 0 == 1 BCE, -1 == 2 BCE, etc.
163     static inline int8_t monthLength(int32_t year, int32_t month);
167      * @param y the extended year
174      * Convert a year, month, and day-of-month, given in the proleptic
176      * @param year Gregorian year, with 0 == 1 BCE, -1 == 2 BCE, etc.
181     static double fieldsToDay(int32_t year, int32_t month, int32_t dom);
184      * Convert a 1970-epoch day number to proleptic Gregorian year,
187      * @param year output parameter to receive year
191      * @param doy output parameter to receive day-of-year (1-based)
193     static void dayToFields(double day, int32_t& year, int32_t& month,
197      * Convert a 1970-epoch day number to proleptic Gregorian year,
200      * @param year output parameter to receive year
205     static inline void dayToFields(double day, int32_t& year, int32_t& month,
209      * Convert a 1970-epoch milliseconds to proleptic Gregorian year,
210      * month, day-of-month, and day-of-week, day of year and millis-in-day.
212      * @param year output parameter to receive year
216      * @param doy output parameter to receive day-of-year (1-based)
219     static void timeToFields(UDate time, int32_t& year, int32_t& month,
232      * @param year Gregorian year, with 0 == 1 BCE, -1 == 2 BCE, etc.
237     static int32_t dayOfWeekInMonth(int32_t year, int32_t month, int32_t dom);
256      * Calculates the Gregorian day shift value for an extended year.
257      * @param eyear Extended year 
271 inline UBool Grego::isLeapYear(int32_t year) {  in isLeapYear()  argument
272     // year&0x3 == year%4  in isLeapYear()
273     return ((year&0x3) == 0) && ((year%100 != 0) || (year%400 == 0));  in isLeapYear()
277 Grego::monthLength(int32_t year, int32_t month) {  in monthLength()  argument
278     return MONTH_LENGTH[month + (isLeapYear(year) ? 12 : 0)];  in monthLength()
286 inline void Grego::dayToFields(double day, int32_t& year, int32_t& month,  in dayToFields()  argument
289   dayToFields(day,year,month,dom,dow,doy_unused);  in dayToFields()