The four units are day, week, month and year. Each may be
written singular or plural, in any capitalization ('day', 'Days',
'YEARS'). The one-letter shorthands d, w, M and y are also
accepted, and those are case sensitive: M is months, to leave m
free for minutes in packages built on top of this one.
Units that can be passed to HDate.add and HDate.subtract.
The four units are
day,week,monthandyear. Each may be written singular or plural, in any capitalization ('day','Days','YEARS'). The one-letter shorthandsd,w,Mandyare also accepted, and those are case sensitive:Mis months, to leavemfree for minutes in packages built on top of this one.