MATLAB Answers

Change datetime display format

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Orion
Orion on 18 Oct 2020
Commented: Star Strider on 27 Oct 2020
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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Answers (1)

Star Strider
Star Strider on 18 Oct 2020
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.

  2 Comments

Orion
Orion on 27 Oct 2020
Thanks for the answer. To clarify, I want to keep the time zone as 'UTCLeapSeconds', and only show the 'HH:mm' (00:02) part of the time as a tickmark label. I don't want to show the full time (eg: 2014-08-01T00:02:39.149Z) on the plot because in that format, a single one covers the entire axis while there are several tickmarks.
Star Strider
Star Strider on 27 Oct 2020
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
.

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