Designing Games with Game Maker - YoYo Games

date_current_date() Returns the date-time value that corresponds to the
current date only (ignoring the time).
date_current_time() Returns the date-time value that corresponds to the
current time only (ignoring the date).
date_create_datetime(year,month,day,hour,minute,second)
Creates a date-time value corresponding to the indicated date and time.
date_create_date(year,month,day) Creates a date-time value
corresponding to the indicated date.
date_create_time(hour,minute,second) Creates a date-time value
corresponding to the indicated time.
date_valid_datetime(year,month,day,hour,minute,second)
Returns whether the indicated date and time are valid.
date_valid_date(year,month,day) Returns whether the indicated date is
valid.
date_valid_time(hour,minute,second) Returns whether the indicated
time is valid.
date_inc_year(date,amount) Returns a new date that is amount years
after the indicated date. amount must be an integer number.
date_inc_month(date,amount) Returns a new date that is amount months
after the indicated date. amount must be an integer number.
date_inc_week(date,amount) Returns a new date that is amount weeks
after the indicated date. amount must be an integer number.
date_inc_day(date,amount) Returns a new date that is amount days after
the indicated date. amount must be an integer number.
date_inc_hour(date,amount) Returns a new date that is amount hours
after the indicated date. amount must be an integer number.
date_inc_minute(date,amount) Returns a new date that is amount
minutes after the indicated date. amount must be an integer number.
date_inc_second(date,amount) Returns a new date that is amount
seconds after the indicated date. amount must be an integer number.
date_get_year(date) Returns the year corresponding to the date.
date_get_month(date) Returns the month corresponding to the date.
date_get_week(date) Returns the week of the year corresponding to the
date.
date_get_day(date) Returns the day of the month corresponding to the
date.