On Mon, Jul 27, 2015 at 12:47 PM, Ethan Furman firstname.lastname@example.org wrote:
To me, Paul's example is a datetime operation: you start with a datetime
(7am today), perform arithmetic on it by adding a period of time (one day), and get a datetime as the result (7am tomorrow).
Well, OK, let's propose these wordings: It looks like a date operation, ie, add one to the date, but in reality it's a time operation, ie add 86400 seconds to the time. These things sound similar but are very different.
I have to disagree. If I have my alarm at 7am (localtime ;) so I can be at work at 8am I don't care exactly how many seconds have passed, that alarm better go off at 7am local time.
sure, but that is very much a Calendar operation -- "7am tomorrow", On the other hand, if you wanted to sleep a particular length of time,t hen you might want your alarm to go off "in 8 hours" -- that is a different operation.
Calendar operations are very, very useful, but not on the table in this discussion, are they?