(calendar-absolute-from-bahai): Fix the leap-year case (sync from trunk
2008-03-20).
+ * calendar/calendar.el (increment-calendar-month): Optionally handle
+ systems without 12 months per year (sync from trunk 2008-03-31; needed
+ for above holiday-bahai fix).
+
* calendar/cal-islam.el (holiday-islamic): Doc fix (sync from trunk
2008-04-23).
(defconst lunar-phases-buffer "*Phases of Moon*"
"Name of the buffer used for the lunar phases.")
-(defmacro increment-calendar-month (mon yr n)
+(defmacro increment-calendar-month (mon yr n &optional nmonths)
"Increment the variables MON and YR by N months.
Forward if N is positive or backward if N is negative.
-A negative YR is interpreted as BC; -1 being 1 BC, and so on."
- `(let (macro-y)
+A negative YR is interpreted as BC; -1 being 1 BC, and so on.
+Optional NMONTHS is the number of months per year (default 12)."
+ `(let ((nmonths (or ,nmonths 12))
+ macro-y)
(if (< ,yr 0) (setq ,yr (1+ ,yr))) ; -1 BC -> 0 AD, etc
- (setq macro-y (+ (* ,yr 12) ,mon -1 ,n)
- ,mon (1+ (mod macro-y 12))
- ,yr (/ macro-y 12))
+ (setq macro-y (+ (* ,yr nmonths) ,mon -1 ,n)
+ ,mon (1+ (mod macro-y nmonths))
+ ,yr (/ macro-y nmonths))
(and (< macro-y 0) (> ,mon 1) (setq ,yr (1- ,yr)))
(if (< ,yr 1) (setq ,yr (1- ,yr))))) ; 0 AD -> -1 BC, etc