Convert Unix Time in Date Time Format with Milliseconds

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Sarah Maag
Sarah Maag 2019-2-6
评论： Peter Perkins 2024-11-21，20:28
Hello,
i want to convert Unix Time Stamp like this 1545390864126080000 (1.545^18) in a Format like this "Friday, 21. December 2018 11:14:24.126".
I use:
date_time = datestr(unix_time_pose./86400 + datenum(1970,1,1));
unix_time_pose vector is Unix_Time/10^9 and i get something like this '21-Dec-2018 12:04:58'. It is the right date without milliseconds.
Can anyone help me how to get milliseconds,too?
  2 个评论
Sarah Maag
Sarah Maag 2019-2-7
I have a mobile robot. I get the pose from the odometry of the robot. i only named the vector with the unix time stamps unix_time_pose. Each entry of the vector unix_time_pose has the format unix_time/10⁹ (like 1.545^9) because I divided 1.545^18/10⁹.

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采纳的回答

Peter Perkins
Peter Perkins 2019-2-7
What you have is 1ns ticks since 1970. That's sort of Posix time, but at a different resolution. If that's really what you have, you are gonna need to store the raw numbers as a uint64 array, double will not give you enough precision. So
>> t = uint64(1545390864126080000)
t =
uint64
1545390864126080000
>> d = datetime(t,'ConvertFrom','epochtime','TicksPerSecond',1e9,'Format','dd-MMM-yyyy HH:mm:ss.SSSSSSSSS')
d =
datetime
21-Dec-2018 11:14:24.126080000
If you don't care about anything smaller than ms, then you can use double.
>> t = 1545390864126
t =
1545390864126
>> d = datetime(t,'ConvertFrom','epochtime','TicksPerSecond',1e3,'Format','dd-MMM-yyyy HH:mm:ss.SSS')
d =
datetime
21-Dec-2018 11:14:24.126
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Sarah Maag
Sarah Maag 2019-2-10
I updated my Software and installed more packages. Now it works. Thanks a lot.

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更多回答（1 个）

eldar mamedov
eldar mamedov 2024-9-11
If you are reading data in unix timestamp from a .CSV file with a floating point as milliseconds what worked for me was,
dt = datetime(1970,1,1,'Format','dd-MMM-yyyy HH:mm:ss.SSS') + tableData.UnixTime/86400;
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Peter Perkins
Peter Perkins 2024-11-21，20:28
Eldar, this works, but you will likely be happier using the much simpler
datetime(unixTime,"ConvertFrom","posixtime")

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