Unix Time To Utc Matlab

To solve the problem of converting Unix time to UTC in MATLAB, and vice versa, here are the detailed steps you can follow, focusing on efficiency and clarity. This guide will help you seamlessly navigate between these two crucial time representations.

First off, let’s understand the core concept: Unix time is simply the number of seconds that have elapsed since the Unix epoch (January 1, 1970, at 00:00:00 Coordinated Universal Time, or UTC). MATLAB, on the other hand, uses a “datenum” system, which represents dates as serial day numbers, where day 1 is January 1, 0000. For UTC, you need to be mindful of time zones.

Here’s a step-by-step guide:

Understanding the Epoch Difference: The key lies in the difference between MATLAB’s datenum epoch (January 1, 0000) and the Unix epoch (January 1, 1970 UTC). There are precisely 719,529 days between these two epochs. This number is crucial for any conversion.

Unix Time to MATLAB Datetime (UTC):

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Start with your Unix timestamp: This is a single number representing seconds since 1970-01-01 00:00:00 UTC.
Convert Unix seconds to days: Divide the Unix timestamp by the number of seconds in a day (24 * 3600).
Add the MATLAB epoch offset: Add 719529 (the number of days between Jan 0, 0000 and Jan 1, 1970) to the result from step 2. This will give you the MATLAB datenum value in UTC.
In MATLAB, use datenum('1970-01-01 00:00:00', 'yyyy-mm-dd HH:MM:SS'): This function call directly calculates the MATLAB datenum for the Unix epoch, which is approximately 719529. If you perform datenum('1970-01-01 00:00:00', 'yyyy-mm-dd HH:MM:SS') and get a value like 719529.0, you’re on the right track.
The Formula: matlab_datenum = (unix_time_in_seconds / (24 * 3600)) + datenum('1970-01-01 00:00:00', 'yyyy-mm-dd HH:MM:SS');
Example: If your Unix time is 1678886400 (which is March 15, 2023, 00:00:00 UTC), the calculation would be: (1678886400 / 86400) + 719529 = 19431.5 + 719529 = 738960.5. This 738960.5 is your MATLAB datenum for that Unix timestamp.

MATLAB Datetime (UTC) to Unix Time:
1. Start with your MATLAB datenum value: Ensure this value represents a UTC time.
2. Subtract the MATLAB epoch offset: Subtract datenum('1970-01-01 00:00:00', 'yyyy-mm-dd HH:MM:SS') from your MATLAB datenum. This will give you the number of days since the Unix epoch.
3. Convert days to Unix seconds: Multiply the result from step 2 by the number of seconds in a day (24 * 3600). This will give you the Unix timestamp.
4. The Formula: unix_time_in_seconds = (matlab_datenum - datenum('1970-01-01 00:00:00', 'yyyy-mm-dd HH:MM:SS')) * 24 * 3600;
5. Example: If your MATLAB datenum is 738960.5, the calculation would be: (738960.5 - 719529) * 86400 = 19431.5 * 86400 = 1678886400. This 1678886400 is your Unix timestamp.

By following these simple conversions, you can accurately switch between Unix time and MATLAB’s datenum for UTC, ensuring your data analysis is precise and your time handling robust.

Table of Contents

Mastering Unix Time and UTC in MATLAB

Navigating time representations can feel like trying to untangle a ball of yarn, especially when you’re jumping between systems like Unix and MATLAB. But rest assured, with a clear understanding of the underlying principles and the right MATLAB functions, you can handle these conversions with ease. This section will dive deep into everything you need to know about unix time to utc matlab, utc to unix time, and how unix time utc time zone considerations play out.

The Foundation: Understanding Unix Time

Unix time, often called “Epoch time” or “POSIX time,” is a system for tracking time as a single number representing the total seconds elapsed since a specific point in time. This point, known as the Unix epoch, is January 1, 1970, at 00:00:00 Coordinated Universal Time (UTC). It’s a universal and linear way to represent time, making it incredibly useful for computing and data exchange.

Simplicity: Unix time is a simple integer or floating-point number, which makes calculations and comparisons straightforward. No complex date formats or time zone adjustments are inherently part of the number itself.
Global Standard: It’s widely adopted across operating systems, databases, and programming languages, serving as a common language for time. This global consistency is a major benefit for cross-platform data integration.
Precision: While typically represented in seconds, it can be extended to milliseconds or even microseconds for higher precision, depending on the system’s needs. For example, many JavaScript Date objects return time in milliseconds since the Unix epoch.

MATLAB’s Time System: `datenum` and `datetime`

MATLAB has its own powerful and versatile system for handling dates and times. Historically, datenum was the go-to function, but the datetime object introduced in R2014b has significantly improved usability and robustness, especially when dealing with time zones.

The `datenum` Legacy

MATLAB’s datenum function converts date and time strings to serial date numbers. The critical thing to remember about datenum is its epoch: January 1, 0000, at 00:00:00.

Serial Day Numbers: Each day is represented as an integer, and fractional parts represent hours, minutes, and seconds. For instance, datenum('2023-03-15 12:00:00') would return a value ending in .5, indicating midday.
Default Time Zone: By default, datenum operates without explicit time zone awareness. It treats the input as local time unless you specifically adjust for UTC, which often leads to confusion if not handled carefully.
Why it’s still relevant: Many legacy MATLAB scripts and datasets still rely on datenum values. Understanding its mechanics is essential for working with older codebases or external data sources that might export time in this format.

The Modern `datetime` Object

The datetime object is MATLAB’s contemporary approach to time handling. It offers much greater flexibility and clarity, particularly regarding time zones. Adobe resizer free online

Explicit Time Zones: You can explicitly define the TimeZone property of a datetime object, ensuring that time calculations and conversions are accurate regardless of the local system’s time zone settings. This is paramount for unix time to utc matlab conversions.
Readability: datetime objects store year, month, day, hour, minute, second, and even fractional seconds in a more human-readable and programmable format.
Interoperability: datetime objects can be easily converted to and from datenum values, Unix time, and other common time formats, making utc to unix time conversions seamless.

Converting Unix Time to UTC in MATLAB

The primary challenge in converting unix time to utc matlab is aligning the different epochs and units. Unix time is seconds since 1970-01-01 UTC, while datenum is days since 0000-01-00 (yes, day 0 of year 0).

Step-by-Step `datenum` Conversion

Let’s break down the exact formula and process for converting a Unix timestamp to a MATLAB datenum value, ensuring it represents UTC.

Define the Unix Epoch in MATLAB’s datenum:
First, you need to know what the Unix epoch (January 1, 1970, 00:00:00 UTC) translates to in MATLAB’s datenum system.
```
unixEpochDatenum = datenum('1970-01-01 00:00:00', 'yyyy-mm-dd HH:MM:SS');
% This typically evaluates to 719529.0
```
This unixEpochDatenum is your crucial offset. It represents the number of days from MATLAB’s internal epoch (Jan 0, 0000) to the Unix epoch.
Convert Unix Seconds to Days:
A Unix timestamp is in seconds. To integrate it with datenum, which is in days, you must convert these seconds into fractional days.
There are 24 hours * 60 minutes * 60 seconds = 86400 seconds in a day. Json stringify without spaces
```
unix_time_seconds = 1678886400; % Example: March 15, 2023, 00:00:00 UTC
days_since_unix_epoch = unix_time_seconds / (24 * 3600);
```
Calculate the MATLAB datenum:
Now, add the days_since_unix_epoch to your unixEpochDatenum.
```
matlab_utc_datenum = days_since_unix_epoch + unixEpochDatenum;
% For our example: matlab_utc_datenum = (1678886400 / 86400) + 719529
% matlab_utc_datenum = 19431.5 + 719529 = 738960.5
```
This matlab_utc_datenum value 738960.5 represents March 15, 2023, 00:00:00 UTC in MATLAB’s datenum format.

Using `datetime` for Cleaner Conversion

While datenum works, the datetime object makes unix time to utc matlab conversion significantly more intuitive and robust.

Direct datetime Conversion:
You can directly convert Unix timestamps to datetime objects by specifying the ConvertFrom parameter.
```
unix_time_seconds = 1678886400; % Example Unix timestamp
dt_utc = datetime(unix_time_seconds, 'ConvertFrom', 'posixtime', 'TimeZone', 'UTC');
% dt_utc will be: 15-Mar-2023 00:00:00
```
The 'ConvertFrom', 'posixtime' argument tells MATLAB that the input number is a Unix timestamp (seconds since 1970-01-01 UTC). Specifying 'TimeZone', 'UTC' ensures the resulting datetime object is correctly interpreted as UTC. Text truncate tailwind
Converting datetime to datenum (if needed):
If you have a datetime object and still need the datenum representation, you can easily convert it:
```
matlab_datenum_from_dt = datenum(dt_utc);
% This will return 738960.5, matching our manual calculation.
```
This method is often preferred because it leverages the robust datetime object for the initial conversion, then provides the datenum if that format is required downstream.

Converting UTC MATLAB Datetime to Unix Time

Going the other way, from a MATLAB date/time to a Unix timestamp, requires reversing the logic. This is essential for exporting data or integrating with systems that expect Unix time.

From `datenum` to Unix Time

If you have a MATLAB datenum that you know represents a UTC time, here’s how to convert it back to a Unix timestamp:

Define the Unix Epoch in MATLAB’s datenum:
Again, you need the datenum representation of the Unix epoch. Ipv6 hex to decimal
```
unixEpochDatenum = datenum('1970-01-01 00:00:00', 'yyyy-mm-dd HH:MM:SS');
% Still 719529.0
```

Calculate Days Since Unix Epoch:
Subtract the unixEpochDatenum from your MATLAB UTC datenum.

matlab_utc_datenum = 738960.5; % Example: March 15, 2023, 00:00:00 UTC
days_since_unix_epoch = matlab_utc_datenum - unixEpochDatenum;
% For our example: days_since_unix_epoch = 738960.5 - 719529 = 19431.5

Convert Days to Unix Seconds:
Multiply the days_since_unix_epoch by the number of seconds in a day (86400).
```
unix_time_seconds = days_since_unix_epoch * (24 * 3600);
% For our example: unix_time_seconds = 19431.5 * 86400 = 1678886400
```
This unix_time_seconds value 1678886400 is your Unix timestamp.

From `datetime` to Unix Time

Converting a datetime object (especially one with an explicit UTC time zone) to a Unix timestamp is even simpler.

Ensure datetime is UTC:
If your datetime object isn’t already UTC, convert it first: Common elements treatment approach
```
% Assuming dt_any_timezone is an existing datetime object
dt_utc = datetime(dt_any_timezone, 'TimeZone', 'UTC');
% Or if creating from scratch:
dt_utc = datetime(2023, 3, 15, 0, 0, 0, 'TimeZone', 'UTC');
```
Direct posixtime Conversion:
The posixtime function directly converts a datetime object to a Unix timestamp.
```
unix_time_seconds = posixtime(dt_utc);
% For our example: unix_time_seconds = posixtime(datetime(2023, 3, 15, 0, 0, 0, 'TimeZone', 'UTC'))
% This will return 1678886400
```
This is generally the most straightforward and recommended way to convert MATLAB datetime objects to Unix time, as it correctly handles time zones and leap seconds (if the datetime object itself is accurate).

The Importance of Time Zones in Time Conversion

Ignoring time zones is one of the most common pitfalls in time conversion. When performing unix time to utc matlab or utc to unix time conversions, always remember that Unix time is inherently UTC.

Unix Time is UTC: A Unix timestamp 1678886400 always refers to March 15, 2023, 00:00:00 UTC, regardless of where you are in the world. It does not carry any time zone information within the number itself.
MATLAB datetime and TimeZone Property:
- When you create a datetime object without specifying a TimeZone, it defaults to the system’s local time zone or UTC if not specified. This can be problematic.
- Always explicitly set 'TimeZone', 'UTC' when working with Unix time to avoid ambiguity. For example: datetime(your_data, 'TimeZone', 'UTC').
- If you have a datetime object in a local time zone and need to convert it to a Unix timestamp, first convert it to UTC: dt_local.TimeZone = 'UTC'; then use posixtime(dt_local). This ensures the conversion is accurate relative to the global standard.
datenum and Time Zones: datenum values are not time zone aware. If you create a datenum from a local time string, it will be treated as that local time, and any conversion to Unix time based on the general epoch offset will assume that datenum was UTC. This is why using datetime with explicit time zones is superior for reliability.

Let’s say your local time is 2023-03-15 08:00:00 in New York (EDT, UTC-4).
If you do datenum('2023-03-15 08:00:00'), and then convert that datenum to Unix time using the methods above, the Unix time will correspond to 2023-03-15 08:00:00 UTC, not 2023-03-15 12:00:00 UTC (which is 8 AM EDT). This highlights the need for careful time zone handling.

Common Pitfalls and Troubleshooting

Even with the right formulas, unix time to utc matlab and utc to unix time conversions can sometimes go awry. Here are common issues and how to troubleshoot them. Common elements in real estate

Off-by-One-Day Errors

Cause: This usually happens due to misunderstanding the datenum epoch. MATLAB’s datenum starts counting from day 1 on Jan 1, 0000. Unix time starts from Jan 1, 1970.
Solution: Ensure you are consistently using the correct datenum value for the Unix epoch (which is datenum('1970-01-01 00:00:00', 'yyyy-mm-dd HH:MM:SS'), or approximately 719529). Double-check your constant for the number of days between the two epochs.

Time Zone Mismatches

Cause: This is the most frequent culprit. You might be converting a datetime object or datenum that implicitly assumes a local time zone, but then expecting the Unix timestamp to be UTC. Or vice-versa.
Solution:
- Always be explicit with TimeZone: When creating or manipulating datetime objects that will be used for Unix conversion, always specify 'TimeZone', 'UTC'.
- Convert to UTC first: If you have a datetime object in a different time zone (e.g., America/New_York), convert it to UTC before using posixtime.
```
dt_local = datetime(2023, 3, 15, 8, 0, 0, 'TimeZone', 'America/New_York');
dt_utc = datetime(dt_local, 'TimeZone', 'UTC'); % Convert to UTC
unix_ts = posixtime(dt_utc); % This will be correct
```
- Be wary of datestr and datenum: These functions, when used without explicit time zone information, can be deceiving. Always assume their output is in your local time zone unless you’ve done specific manual offsets. For unix time to utc matlab or utc to unix time, stick to datetime objects and their TimeZone property.

Floating-Point Precision Issues

Cause: Unix time is often an integer (seconds), but MATLAB datenum and calculations involving fractions of days can introduce small floating-point errors.
Solution:
- When converting to Unix time (seconds), you might need to use round(), floor(), or ceil() depending on whether you want to truncate or round. For most applications, floor() is appropriate for Unix timestamps representing the start of a second.
- Example: unix_time_seconds = floor(days_since_unix_epoch * (24 * 3600));
- For posixtime, MATLAB handles this precision internally, typically returning a double-precision number that can be rounded as needed.

Incorrect Epoch Definitions

Cause: Sometimes people confuse the Unix epoch with other epochs (e.g., Excel’s epoch, which is Jan 1, 1900, or a system’s internal epoch).
Solution: Reconfirm that your “Unix epoch” constant or calculation for datenum('1970-01-01 00:00:00', ...) is correct. It should consistently resolve to 719529 if using the standard datenum system.

Advanced Time Handling in MATLAB

MATLAB’s datetime object offers a wealth of features beyond simple unix time to utc matlab conversion.

Working with Durations and Timetables

duration Objects: These objects represent spans of time, like 5 hours or 30 minutes. They are invaluable for calculating time differences, adding/subtracting time, and handling time-series data.
```
dt1 = datetime('2023-03-15 00:00:00', 'TimeZone', 'UTC');
dt2 = datetime('2023-03-15 01:30:00', 'TimeZone', 'UTC');
time_diff = dt2 - dt1; % Returns a duration object: 1h 30min 0s
```
You can then convert durations to seconds for easy integration with Unix time calculations if needed: seconds(time_diff).
timetable Objects: For time-series data, timetable is a game-changer. It’s a data type specifically designed to store time-stamped data, making operations like synchronization, aggregation, and resampling incredibly efficient.
```
T = timetable(dt_utc', rand(size(dt_utc))', 'VariableNames', {'SensorData'});
% You can then perform operations on T, and the time stamps are inherently handled.
```
If your data has Unix timestamps, you can convert them to datetime objects and then create a timetable, providing a robust framework for your analysis. Prime numbers tv show

Handling Leap Seconds

Leap seconds are one-second adjustments that are occasionally applied to UTC to keep it synchronized with astronomical time. While Unix time usually refers to POSIX time (which doesn’t account for leap seconds), strict UTC conversions using datetime can implicitly handle them if your MATLAB version and system time data are up-to-date.

posixtime and Leap Seconds: The posixtime function in MATLAB, when converting a datetime object, generally adheres to the POSIX definition, where leap seconds are “smeared” or ignored. This means posixtime will give you the same number of seconds even if a leap second occurred, maintaining a smooth progression.
Precision and Data Source: For most engineering and scientific applications, the standard posixtime behavior is sufficient. If you require extremely precise time calculations that account for leap seconds (e.g., for satellite navigation or certain astronomical observations), you would need to consult specialized libraries or services. However, for typical unix time to utc matlab conversions, MATLAB’s built-in functions are reliable.

Practical Applications and Best Practices

Applying these conversions effectively means more than just knowing the formulas; it means adopting best practices for data integrity and clarity.

Data Logging and Storage

Store in Unix Time: For many applications, especially in data logging or communication protocols, storing timestamps as Unix time (seconds since epoch) is highly efficient and space-saving. It simplifies database queries and data exchange.
Convert on Demand: When you retrieve this data for analysis in MATLAB, convert unix time to utc matlab datetime objects (with TimeZone='UTC') for robust analysis.
Consistent Time Zones: Always ensure that all time-related data, whether it’s from sensors, external databases, or user inputs, is consistently handled with respect to UTC. This eliminates ambiguity and simplifies integration. A good practice is to always convert incoming timestamps to UTC as early as possible in your data pipeline.

Visualizing Time-Series Data

Native datetime Plotting: MATLAB’s plotting functions (e.g., plot, plotyy) inherently understand datetime arrays. When you plot datetime objects on the x-axis, MATLAB automatically formats the ticks for readability (e.g., ‘HH:MM:SS’ or ‘dd-mmm-yyyy’).
```
unix_times = [1678886400, 1678890000, 1678893600]; % example Unix times
data_values = [10, 12, 15];
dt_utc_array = datetime(unix_times, 'ConvertFrom', 'posixtime', 'TimeZone', 'UTC');
plot(dt_utc_array, data_values);
xlabel('Time (UTC)');
ylabel('Measurement');
title('Sensor Data Over Time');
```
This approach ensures your plots are clear and correctly represent time in UTC.

Integrating with External Systems

API Interactions: Many web APIs and data services exchange timestamps in Unix time. When you receive data from such an API, immediately convert the Unix timestamp to a datetime object with TimeZone='UTC' in MATLAB.
Database Timestamps: If your database stores timestamps in a format different from Unix time or MATLAB’s datenum (e.g., DATETIME or TIMESTAMP types), ensure you understand how your database driver handles time zones and perform necessary conversions to UTC upon import into MATLAB. For example, if a database stores local time, you’ll need to know the database’s configured time zone to correctly convert it to UTC in MATLAB.

By adhering to these best practices, you can build reliable and accurate time-sensitive applications and analyses in MATLAB, regardless of the complexity of your data sources. The key is consistency, clarity, and leveraging the powerful datetime object to manage unix time to utc matlab and utc to unix time conversions effectively.

FAQ

What is Unix time?

Unix time, also known as Epoch time or POSIX time, is a system for describing a point in time by the number of seconds that have elapsed since the Unix epoch, which is January 1, 1970, at 00:00:00 Coordinated Universal Time (UTC), not counting leap seconds.

Why is converting Unix time to UTC in MATLAB important?

It is crucial for data consistency and interoperability. Many systems and APIs use Unix time, while MATLAB uses its own datenum or datetime objects. Converting to UTC ensures that time data is universally understood and accurately analyzed, avoiding time zone errors. How much does proofreading cost

What is the MATLAB `datenum` format?

MATLAB’s datenum function converts dates and times to serial day numbers, where January 1, 0000, is day 1. Fractional parts of the number represent hours, minutes, and seconds. It’s a numerical representation of dates and times.

How do I convert a Unix timestamp to a MATLAB `datenum` (UTC)?

To convert a Unix timestamp (seconds since 1970 UTC) to a MATLAB datenum in UTC, you can use the formula: matlab_datenum = (unix_time_seconds / (24 * 3600)) + datenum('1970-01-01 00:00:00', 'yyyy-mm-dd HH:MM:SS');. The datenum('1970-01-01 00:00:00', ...) part calculates the datenum value for the Unix epoch.

Can I use the `datetime` object for Unix time conversions in MATLAB?

Yes, and it’s generally the recommended approach for unix time to utc matlab conversions due to its explicit time zone handling. You can use datetime(unix_time_seconds, 'ConvertFrom', 'posixtime', 'TimeZone', 'UTC'); to directly convert a Unix timestamp to a UTC datetime object.

How do I convert a UTC MATLAB `datetime` object to Unix time?

To convert a MATLAB datetime object (ensuring it’s in UTC) to a Unix timestamp, use the posixtime function: unix_time_seconds = posixtime(dt_utc);. Make sure your dt_utc datetime object has its TimeZone property set to 'UTC'.

What is the `TimeZone` property in MATLAB’s `datetime` objects?

The TimeZone property allows you to specify the time zone for a datetime object. This is critical for accurate calculations and conversions, especially when dealing with UTC or local time zones. Always set it explicitly (e.g., 'UTC') for clarity. Fibonacci numbers and the golden ratio

Why is the `datenum` for ‘1970-01-01 00:00:00’ approximately 719529?

This value represents the number of days from MATLAB’s datenum epoch (January 1, 0000) to the Unix epoch (January 1, 1970). This constant offset is essential for aligning the two time systems.

What happens if I don’t specify a time zone when creating a `datetime` object?

If you don’t specify a TimeZone when creating a datetime object, MATLAB typically uses the system’s local time zone by default. This can lead to incorrect conversions if your intention was to work with UTC.

How do I convert a `datenum` to a `datetime` object in MATLAB?

You can convert a datenum to a datetime object using datetime(matlab_datenum, 'ConvertFrom', 'datenum', 'TimeZone', 'UTC');. It’s crucial to specify the TimeZone if you know the datenum represents a UTC time.

Are there any issues with floating-point precision during conversions?

Yes, calculations involving fractional days and large numbers of seconds can introduce minor floating-point errors. For unix time to utc matlab conversions, consider rounding the final Unix timestamp to an integer if you need whole seconds (e.g., using floor() or round()).

How do leap seconds affect Unix time and MATLAB conversions?

Unix time (POSIX time) is typically defined to ignore or “smear” leap seconds for a monotonically increasing sequence. MATLAB’s posixtime function generally follows this convention. For most standard unix time to utc matlab applications, you won’t need to manually account for leap seconds. Why is it called t9 texting

Can I convert a string date directly to Unix time in MATLAB?

Yes, you can first convert the string date to a datetime object, ensuring the correct time zone, and then use posixtime. Example: unix_ts = posixtime(datetime('2023-03-15 00:00:00', 'InputFormat', 'yyyy-MM-dd HH:mm:ss', 'TimeZone', 'UTC'));

What if my Unix timestamp includes milliseconds or microseconds?

Unix time is usually in seconds. If you have milliseconds, divide by 1000. If you have microseconds, divide by 1,000,000 before performing the conversion to MATLAB, and adjust your datetime object creation if needed (e.g., by including fractional seconds). MATLAB’s datetime can handle fractional seconds.

How can I get the current Unix time in MATLAB?

You can get the current UTC time as a datetime object and then convert it to Unix time: posixtime(datetime('now', 'TimeZone', 'UTC')).

What is the difference between `datenum` and `datetime` in terms of time zones?

datenum is time zone agnostic by itself; it’s just a numerical representation of days since year 0. datetime objects, however, have a TimeZone property that makes them inherently time zone aware and allows for precise conversions between time zones and to standard representations like Unix time.

Can I use these conversions for historical data?

Yes, the methods for unix time to utc matlab and utc to unix time are valid for any historical date and time. Just ensure that the Unix timestamp is correctly representing UTC, and your MATLAB datetime objects are consistently marked as UTC. Thousands separator js

Why might my converted times be off by several hours?

This is almost always a time zone issue. You might be converting a local time without explicitly setting its TimeZone to 'UTC', or you might be applying a fixed offset based on an incorrect assumption about the source time zone. Always ensure your datetime objects are set to TimeZone='UTC' before conversion to or from Unix time.

How do I handle date strings from different time zones when converting to Unix time in MATLAB?

First, parse the date string into a datetime object, specifying its original time zone. Then, convert that datetime object to UTC before using posixtime. Example: dt_original = datetime('2023-03-15 08:00:00', 'TimeZone', 'America/New_York'); dt_utc = datetime(dt_original, 'TimeZone', 'UTC'); unix_ts = posixtime(dt_utc);

Is there a direct built-in function in MATLAB for Unix time to local time conversion?

While there isn’t a single function for “Unix time to local time,” you can achieve this by first converting the Unix time to a UTC datetime object, and then changing the TimeZone property of that datetime object to your desired local time zone: dt_local = datetime(unix_time_seconds, 'ConvertFrom', 'posixtime', 'TimeZone', 'UTC'); dt_local.TimeZone = 'America/New_York';

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Unix time to utc matlab

Mastering Unix Time and UTC in MATLAB

The Foundation: Understanding Unix Time

MATLAB’s Time System: datenum and datetime

The datenum Legacy

The Modern datetime Object