how to floor time for each hour?

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Lilya
Lilya 2022-3-15
评论： Lilya 2022-3-17
Hi Experts,
I have this time format, and i want to have the time only for each hour. Could anyone please help with this?
'12-Dec-2021 09:09:04'
'12-Dec-2021 09:24:04'
'12-Dec-2021 09:39:04'
'12-Dec-2021 09:54:04'
Much appreciated
  2 个评论
KSSV
KSSV 2022-3-15
What's your desired output?
Lilya
Lilya 2022-3-16
to have the data at each hour instead of having different time steps for each hour

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采纳的回答

Star Strider
Star Strider 2022-3-15
Ran in:
Try this —
tv = {'12-Dec-2021 09:09:04'
'12-Dec-2021 09:24:04'
'12-Dec-2021 09:39:04'
'12-Dec-2021 09:54:04'};
dtv = datetime(tv, 'Format','dd-MMM-yyyy HH') % Display Only The Hour
dtv = 4×1 datetime array
12-Dec-2021 09 12-Dec-2021 09 12-Dec-2021 09 12-Dec-2021 09
dtv = datetime(tv, 'Format','dd-MMM-yyyy HH:00:00') % Display Hour, Set Rest To Zeros
dtv = 4×1 datetime array
12-Dec-2021 09:00:00 12-Dec-2021 09:00:00 12-Dec-2021 09:00:00 12-Dec-2021 09:00:00
The 'Format' name-value pair controls the display, so set it however you want it.
.
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Star Strider
Star Strider 2022-3-16
编辑：Star Strider 2022-3-16
As always, my pleasure!
EDIT — (16 Mar 2022 at 12:40)
To summarise the data for each hour, use the table2timetable function and then the retime function.
.

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更多回答（2 个）

Steven Lord
Steven Lord 2022-3-15
Ran in:
If you want to actually modify the data rather than just changing how the data is displayed you can use dateshift.
tv = {'12-Dec-2021 09:00:00',
'12-Dec-2021 09:09:04'
'12-Dec-2021 09:24:04'
'12-Dec-2021 09:39:04'
'12-Dec-2021 09:54:04'};
dtv = datetime(tv)
dtv = 5×1 datetime array
12-Dec-2021 09:00:00 12-Dec-2021 09:09:04 12-Dec-2021 09:24:04 12-Dec-2021 09:39:04 12-Dec-2021 09:54:04
dtv2 = dateshift(dtv, 'start', 'hour')
dtv2 = 5×1 datetime array
12-Dec-2021 09:00:00 12-Dec-2021 09:00:00 12-Dec-2021 09:00:00 12-Dec-2021 09:00:00 12-Dec-2021 09:00:00
To check that the data has actually been changed:
dtv2 == dtv(1)
ans = 5×1 logical array
1 1 1 1 1
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Steven Lord
Steven Lord 2022-3-16
Based on your answer to KSSV's comment "to have the data at each hour instead of having different time steps for each hour" I suspect that storing your data in a timetable array and using retime to retime it to an hourly basis might be a solution to your larger problem.
Lilya
Lilya 2022-3-17
yes.. I did that and it works perfectly!
thank you very very much.

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Arif Hoq
Arif Hoq 2022-3-15
A={'12-Dec-2021 09:09:04'
'12-Dec-2021 09:24:04'
'12-Dec-2021 09:39:04'
'12-Dec-2021 09:54:04'};
B=datetime(A,'Format','hh') % if only hour
B1=datetime(A,'Format','hh:mm:ss') % if hour,min,sec

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