changing minutes after midnight into a datetime array
6 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
Suppose you have the matrix minutesaftermid which contains integers that represent the minutes after midnight, e.g. 1,2,3,4,5,6,7,......
How do I convert this format to a datetime array.
t = datetime(Y,M,D,H,MI,S,MS), but I only needs the MI.
0 Commenti
Risposta accettata
per isakson
il 26 Ott 2017
Modificato: per isakson
il 26 Ott 2017
"but I only need the MI" I don't think you can avoid the date and time.
X = 60*[1,2,3,4,5,6,7];
T = datetime( X, 'ConvertFrom','epochtime', 'Epoch','2000-01-01' )
T =
Columns 1 through 4
2000-01-01 00:01:00 2000-01-01 00:02:00 2000-01-01 00:03:00 2000-01-01 00:04:00
Columns 5 through 7
2000-01-01 00:05:00 2000-01-01 00:06:00 2000-01-01 00:07:00
and
>> T.Minute
ans =
1 2 3 4 5 6 7
Remark: the year 2000 is a leap year.
0 Commenti
Più risposte (2)
Walter Roberson
il 26 Ott 2017
datetime('today') + minutes(minutesaftermid)
if you wanted it to be relative to today (local time)
If you just need minutes after midnight and not any particular day, you should probably be leaving it as a duration array instead of a datetime array.
0 Commenti
Peter Perkins
il 16 Nov 2017
datetimes are dates+times. As Walter says, unless you also have a set of dates, or you want 'today', then you likely want a duration array, and so just call the minutes function to create one.
3 Commenti
Peter Perkins
il 20 Nov 2017
Ah, right. So you can either add minutes (as you showed), or if you have the date portion as numeric values, you can use the "roll-over" behavior built into the constructor:
>> datetime(2017,11,1:3,0,[1430 1440 1450],0)
ans =
1×3 datetime array
01-Nov-2017 23:50:00 03-Nov-2017 00:00:00 04-Nov-2017 00:10:00
Walter Roberson
il 20 Nov 2017
I might...
T = datetime(2017,11,1:3,0,[1430 1440 1450],0, 'TimeZone', 'local');
[H, M] = hms(T);
mins_since_midnight = H * 60 + M
... though I would want to double-check outputs when there are time zone changes. I have now gotten myself confused about what "minutes since midnight" even means when there are time-zone changes.
Vedere anche
Categorie
Scopri di più su Dates and Time in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!