Change datetime display format

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Orion
Orion 2020-10-18
评论： James Tursa 2024-11-16
I have a julian date that I convert to a MATLAB datetime variable using:
tj = 2.456870501842000e+06;
mtime = datetime(tj,'ConvertFrom','juliandate','TimeZone','UTCLeapSeconds')
This creates the datetime variable "mtime" displayed as 2014-08-01T00:02:39.149Z. I want to change the display format of mtime (for plotting purposes) to show only hour:minute,
mtime.Format = 'HH:mm';
But I get this error:
The date format for UTCLeapSeconds datetimes must be 'uuuu-MM-dd'T'HH:mm:ss.SSS'Z''.
So is it not possible to change the display format of a datetime variable?

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回答（1 个）

Star Strider
Star Strider 2020-10-18
It is possible. It just takes some coding gymnastics:
tj = 2.456870501842000e+06;
mtime = datetime(tj,'ConvertFrom','juliandate','TimeZone','UTCLeapSeconds', 'Format','uuuu-MM-dd''T''HH:mm:ss.SSS''Z''')
ltime = mtime;
ltime.TimeZone = 'local';
ltime.Format = 'HH:mm'
producing:
ltime =
datetime
18:02
Set ‘TimeZone’ to be whatever you want it to be.
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Star Strider
Star Strider 2020-10-27
Simple enough. Just change the time zone back to UTC instead of local:
tj = 2.456870501842000e+06;
mtime = datetime(tj,'ConvertFrom','juliandate','TimeZone','UTCLeapSeconds', 'Format','uuuu-MM-dd''T''HH:mm:ss.SSS''Z''')
ltime = mtime;
ltime.TimeZone = 'UTC';
ltime.Format = 'HH:mm'
producing:
ltime =
datetime
00:02
.
James Tursa
James Tursa 2024-11-16
Ran in:
Note that this proposal doesn't preserve the leap second information, so it is not a solution.
mtime = datetime(1972,6,30,23,59,60.5,'TimeZone','UTCLeapSeconds')
mtime = datetime
1972-06-30T23:59:60.500Z
ltime = mtime;
ltime.TimeZone = 'local';
ltime.Format = 'HH:mm'
ltime = datetime
23:59
ltime.TimeZone = 'UTCLeapSeconds'
ltime = datetime
1972-06-30T23:59:59.500Z
Everything has to stay in the UTCLeapSeconds time zone with the required Format to preserve the leap second. There is no direct solution to OP request using datetime as far as I know that keeps the leap second intact.

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