File.GetLastWriteTimeUtc Method

Definition

Overloads

GetLastWriteTimeUtc(SafeFileHandle)

Returns the last write date and time, in Coordinated Universal Time (UTC), of the specified file or directory.

GetLastWriteTimeUtc(String)

Returns the date and time, in Coordinated Universal Time (UTC), that the specified file or directory was last written to.

GetLastWriteTimeUtc(SafeFileHandle)

Source:
File.cs
Source:
File.cs
Source:
File.cs

Returns the last write date and time, in Coordinated Universal Time (UTC), of the specified file or directory.

public static DateTime GetLastWriteTimeUtc (Microsoft.Win32.SafeHandles.SafeFileHandle fileHandle);

Parameters

fileHandle
SafeFileHandle

A SafeFileHandle to the file or directory for which to obtain last write date and time information.

Returns

A DateTime structure set to the last write date and time for the specified file or directory. This value is expressed in UTC time.

Exceptions

fileHandle is null.

The caller does not have the required permission.

Applies to

.NET 9 and other versions
Product Versions
.NET 7, 8, 9

GetLastWriteTimeUtc(String)

Source:
File.cs
Source:
File.cs
Source:
File.cs

Returns the date and time, in Coordinated Universal Time (UTC), that the specified file or directory was last written to.

public static DateTime GetLastWriteTimeUtc (string path);

Parameters

path
String

The file or directory for which to obtain write date and time information.

Returns

A DateTime structure set to the date and time that the specified file or directory was last written to. This value is expressed in UTC time.

Exceptions

The caller does not have the required permission.

.NET Framework and .NET Core versions older than 2.1: path is a zero-length string, contains only white space, or contains one or more invalid characters. You can query for invalid characters by using the GetInvalidPathChars() method.

path is null.

The specified path, file name, or both exceed the system-defined maximum length.

path is in an invalid format.

Remarks

Note

This method may return an inaccurate value, because it uses native functions whose values may not be continuously updated by the operating system. Each operating system manages the last write time according to its own rules. To improve performance, an operating system might not set the last write time value to the exact time of the last write operation, but might set it to a close approximation instead.

If the file described in the path parameter does not exist, this method returns 12:00 midnight, January 1, 1601 A.D. (C.E.) Coordinated Universal Time (UTC).

The path parameter is permitted to specify relative or absolute path information. Relative path information is interpreted as relative to the current working directory. To obtain the current working directory, see GetCurrentDirectory.

For a list of common I/O tasks, see Common I/O Tasks.

See also

Applies to

.NET 9 and other versions
Product Versions
.NET Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 1.3, 1.4, 1.6, 2.0, 2.1
UWP 10.0