Скачать или смотреть How to Convert a Date to Milliseconds in C#

Learn how to convert a date to milliseconds in C#, including working with local time and Unix timestamps.
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How to Convert a Date to Milliseconds in C

When working with date and time in C, you may need to convert a given date to milliseconds. This can be particularly useful when dealing with Unix timestamps or performing calculations that require finer granularity.

Working with DateTime in C

In C, the DateTime structure is provided to work with dates and times. To convert a DateTime object to milliseconds since the Unix epoch (January 1, 1970), you'll typically follow these steps:

Get the DateTime object: Create or obtain the DateTime object you want to convert.

Convert to Universal Time: Ensure the DateTime object is in Universal Time Coordinated (UTC).

Calculate the Unix timestamp: Subtract the Unix epoch from the DateTime object and convert the resulting TimeSpan to milliseconds.

Example Code

Here’s a straightforward example to demonstrate how to convert a DateTime to milliseconds in C:

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Local Time Considerations

If working with local time, it’s important to convert it to UTC before performing calculations to avoid any discrepancies due to time zone differences.

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This conversion ensures that you get a consistent and accurate millisecond value regardless of the local time zone.

Summary

Converting a date to milliseconds in C involves creating a DateTime object, converting it to UTC, and then calculating the elapsed time in milliseconds since the Unix epoch. This approach ensures accurate conversions while considering local time zones.

With this knowledge, you can efficiently handle date and time conversions in your C applications, especially when you need to work with Unix timestamps or perform time-based operations with millisecond precision.