Why doesn't timezone work with datetime

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LR
LR 2023-8-24
编辑： Seth Furman 2023-9-14
Ran in:
I want to convert a posix time to a datetime for the time zone at a specific longitude. The timezone function gives you the time zone at a specific longitude, but none of the outputs are accepted by datetime.
[a,b,c] = timezone(-80)
a = 5
b = 'R'
c = '+5 R'
try
datetime(1685585049.879,'ConvertFrom','posixtime','TimeZone',a)
end
try
datetime(1685585049.879,'ConvertFrom','posixtime','TimeZone',b)
end
try
datetime(1685585049.879,'ConvertFrom','posixtime','TimeZone',c)
end

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采纳的回答

Star Strider
Star Strider 2023-8-24
Ran in:
The timezone function is from the Mapping Toolbox, and its results are not compatible with the datetime function. The otherwise compatible timezones function does not take longitude arguments.
Try this instead —
TZ = string(fix(-80/15)) % Time Zone (-80° Longitude)
TZ = "-5"
Time = datetime(1685585049.879,'ConvertFrom','posixtime','TimeZone',TZ)
Time = datetime
31-May-2023 21:04:09
.

更多回答（1 个）

Seth Furman
Seth Furman 2023-9-14
编辑：Seth Furman 2023-9-14
Ran in:
Adding to @Star Strider's answer:
The value of TimeZone can be an ISO 8601 character vector of the form +HH:mm or -HH:mm; for example, '+01:00', to specify a time zone that is a fixed offset from UTC.
https://www.mathworks.com/help/matlab/ref/datetime.html#buhzxmk-1-TimeZone
lon = 80;
zd = timezone(lon)
zd = -5
tz = compose("%+03d:00",zd)
tz = "-05:00"
dt = datetime(1685585049.879,ConvertFrom="posixtime",TimeZone=tz)
dt = datetime
31-May-2023 21:04:09

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