How to Truncate Milliseconds from a .NET DateTime Object?

Removing Milliseconds from .NET DateTime Objects

When working with timestamps from various sources, aligning precision by removing milliseconds from a .NET DateTime object is often crucial. This guide details efficient methods using built-in functions and a custom extension method.

Using Built-in Methods:

To eliminate milliseconds using built-in functions, adjust the DateTime's Ticks property by subtracting the remainder after division by TimeSpan.TicksPerSecond, while preserving the Kind property:

<code class="language-csharp">DateTime dateTime = ... any DateTime value ...;
dateTime = new DateTime(
    dateTime.Ticks - (dateTime.Ticks % TimeSpan.TicksPerSecond), 
    dateTime.Kind
);</code>

Concise Alternative:

A more compact equivalent:

<code class="language-csharp">dateTime = dateTime.AddTicks(-(dateTime.Ticks % TimeSpan.TicksPerSecond));</code>

Extension Method for Reusability:

For broader application, create an extension method:

<code class="language-csharp">public static DateTime TruncateMilliseconds(this DateTime dateTime, TimeSpan timeSpan)
{
    if (timeSpan == TimeSpan.Zero) return dateTime;
    if (dateTime == DateTime.MinValue || dateTime == DateTime.MaxValue) return dateTime;
    return dateTime.AddTicks(-(dateTime.Ticks % timeSpan.Ticks));
}</code>

Practical Application:

This extension method allows truncation to various intervals:

<code class="language-csharp">dateTime = dateTime.TruncateMilliseconds(TimeSpan.FromMilliseconds(1)); // Remove milliseconds
dateTime = dateTime.TruncateMilliseconds(TimeSpan.FromSeconds(1));   // Truncate to seconds
dateTime = dateTime.TruncateMilliseconds(TimeSpan.FromMinutes(1));   // Truncate to minutes
// ... and so on</code>

These techniques provide straightforward ways to remove milliseconds from .NET DateTime objects, ensuring consistent timestamp comparisons across different systems.

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