# 
## Overview

**`TimeUnit`** is an #key# enum: short for enumeration #key# that deals with different units of time and operations related to it. 

For example, it has different units of time like: 

- `NANOSECONDS`
- `MICROSECONDS`
- `MILLISECONDS` 
- `SECONDS`
- `MINUTES` 
- `HOURS`
- `DAYS`

The **`toMillis()` method** of the `TimeUnit` converts the time represented by the `TimeUnit` object to milliseconds since midnight UTC on January 1, 1970.

#                    
## How to import the `TimeUnit` enum

The `TimeUnit` enum is defined in the `java.util.concurrent` package. Use the import statement below to import the `TimeUnit` enum.

---
```
import java.util.concurrent.TimeUnit;
```

#   
#  Syntax

---
```
public long toMillis(long duration)
```
---

# 
## Parameters

* **`long duration`**: the duration to be converted to milliseconds.

---
> The duration parameter value relies on the unit of time chosen for the time unit object.

##
## Return value  

This method returns the converted duration to milliseconds, `Long.MIN_VALUE` if the conversion overflows negatively, or `Long.MAX_VALUE` if it overflows positively.

# 
## Code

In the code below, we get the current time in seconds using the `Instant` class. 

Next, we create a `TimeUnit` object with the help of `SECONDS`, the time unit represents one second. 

We pass the current time in seconds to the `toMillis` method of the `TimeUnit` object created to get the time in milliseconds.

import java.time.Instant;
import java.util.concurrent.TimeUnit;

class Main {
    public static void main(String[] args) {

        long currentTimeSeconds = Instant.now().getEpochSecond();
        TimeUnit timeUnit = TimeUnit.SECONDS;
        System.out.println("The time " + currentTimeSeconds + " seconds in milliseconds = " + timeUnit.toMillis(currentTimeSeconds));
    }
}

What is TimeUnit.toMillis in Java?

TimeUnit.toMillis converts time to milliseconds, handling various time units and overflow scenarios. Import via java.util.concurrent.TimeUnit.

What is TimeUnit.toMillis in Java?

Overview

How to import the TimeUnit enum

Syntax

Parameters

Return value

Code

How to import the `TimeUnit` enum