Date & Time Parts I
d.cwday
Return the day of calendar week of date d (1-7, Monday is 1)
d.cweek
Return the calendar week number of date d (1-53)
d.day
Return the day of the month of date d (1-31)
d.month
Return the month (1-12) of date d (option 2)
d.wday
Return the day of week of date d (0-6, Sunday is zero)
d.yday
Return the day of year of date d (1-366)
d.year
Return the year of date d
Addition / Subtraction I
d + integer
Return a date object with integer days added to date d
d - integer
Return a date object with integer days subtracted from date d
d1 - d2
Return the difference between date d1 and date d2
d << integer
Return a date object with integer months subtracted from date d
d >> integer
Return a date object with integer months added to date d
d.next
Return a date object denoting the following date of date d (option 1)
Addition / Subtraction II
d.next_day
Date d + 1 day (long form)
d.next_month
Date d + 1 month (long form)
d.next_year
Date d + 1 year (long form)
d.prev_day
Date d - 1 day (long form)
d.prev_month
Date d - 1 month (long form)
d.prev_year
Date d - 1 year (long form)
d.succ
Return a date object denoting the following date of date d (option 2)
Constants I
Date::ABBR_DAYNAMES
Array of abbreviated day names
Date::ABBR_MONTHNAMES
Array of abbreviated month names
Date::DAYNAMES
Array of full names of days of the week
Date::ENGLAND
The Julian day number of the day of calendar reform for England and her colonies
Date::GREGORIAN
The Julian day number of the day of calendar reform for the proleptic Gregorian calendar
Date::ITALY
The Julian day number of the day of calendar reform for Italy
Date::JULIAN
The Julian day number of the day of calendar reform for the proleptic Julian calendar
Date::MONTHNAMES
Array of full month names
Conversion I
d.to_date
Return self of date d
d.to_datetime
Convert date d to DateTime
d.to_s
Return a string of date d in ISO 8601 format
d.to_time
Convert date d to Time
Iteration I
d1.downto(d2)
Iterate down from dates d1 to d2 one day at a time passing date to block
d1.step(d2, integer)
Iterate integer steps at a time from dates d1 to d2
d1.upto(d2)
Iterate up from dates d1 to d2 one day at a time passing date to block
Inspection I
d.friday?
Return true if date d is Friday
d.monday?
Return true if the date is Monday
d.saturday?
Return true if the date is Saturday
d.sunday?
Return true if date d is Sunday
d.thursday?
Return true if date d is Thursday
d.tuesday?
Return true if date d is Tuesday
d.wednesday?
Return true if date d is Wednesday
Inspection II
d.inspect
Return the value as a string for inspection of date d
d.gregorian?
Return true if date d is on or after the day of calendar reform
d.julian?
Return true if date d is before the day of calendar reform
d.leap?
Return true if the year is a leap year of date d
General I
d1 <=> d2
Compare two dates d1 and d2 and return -1, 0, 1, or nil.
d1 === d2
Return true if d1 and d2 are the same day
d.asctime
Return a string in asctime format. Equivalent to strftime('%c') (option 1)
d.ctime
Return a string in asctime format. Equivalent to strftime('%c') (option 2)
d.httpdate
Format date d as http date (equivalent to strftime('%a, %d %b %Y %T GMT')
Date & Time Parts II
d.ajd
Return the astronomical Julian day number of date d
d.amjd
Return the astronomical modified Julian day number of date d
d.cwyear
Return the calendar week based year of date d
d.day_fraction
Return the fractional part of the day of date d
d.jd
Return the Julian day number of date d
d.mon
Return the month (1-12) of date d (option 1)
d.start
Return the Julian day number denoting the day of calendar reform
