How to Truncate Milliseconds from a .NET DateTime Value?

Removing Milliseconds from .NET DateTime Values

When comparing timestamps from an external source with database values, it's often necessary to eliminate millisecond precision discrepancies. This typically arises when the incoming timestamp lacks millisecond detail, requiring the removal of milliseconds from the .NET DateTime object.

Here are efficient methods for removing milliseconds:

Method 1: Direct Ticks Manipulation

This approach directly modifies the DateTime's Ticks property:

DateTime dateTime = ...; // Your DateTime value
dateTime = new DateTime(dateTime.Ticks - (dateTime.Ticks % TimeSpan.TicksPerSecond), dateTime.Kind);

Method 2: Using AddTicks

A more concise alternative utilizes the AddTicks method:

dateTime = dateTime.AddTicks(-(dateTime.Ticks % TimeSpan.TicksPerSecond));

Method 3: Extension Method for Customizable Truncation

For greater flexibility, an extension method allows truncation to any desired interval:

public static DateTime Truncate(this DateTime dateTime, TimeSpan timeSpan)
{
    return dateTime.AddTicks(-(dateTime.Ticks % timeSpan.Ticks));
}

This extension method enables millisecond truncation with:

dateTime = dateTime.Truncate(TimeSpan.FromMilliseconds(1));

Furthermore, it supports truncation to seconds or minutes:

dateTime = dateTime.Truncate(TimeSpan.FromSeconds(1)); // Truncate to the nearest second
dateTime = dateTime.Truncate(TimeSpan.FromMinutes(1)); // Truncate to the nearest minute

These methods provide straightforward solutions for removing milliseconds from .NET DateTime values, ensuring accurate timestamp comparisons regardless of precision differences.

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