second — Extract second values from datetime values.

second extracts the second component from a datetime scalar or array and returns the result as doubles with the same shape as the input. Fractional seconds are preserved when the datetime stores sub-second precision.

How second works

• second(t) accepts datetime scalars and datetime arrays.
• The output shape matches the input shape.
• Returned values are doubles so fractional seconds can be represented.
• Passing a non-datetime value raises a datetime-specific error.

How RunMat runs second on the GPU

second does not dispatch GPU kernels; it extracts the second component from CPU-side datetime objects.

GPU memory and residency

No. second reads datetime objects on the CPU and returns ordinary host-side numeric arrays.

Examples

Extract whole seconds from a scalar datetime

t = datetime(2024, 4, 9, 13, 30, 5);
s = second(t)

Expected output:

s = 5

Preserve fractional seconds

t = datetime(2024, 4, 9, 13, 30, 5.25);
s = second(t)

Expected output:

s = 5.2500

FAQ

Related Datetime functions

Open-source implementation

Unlike proprietary runtimes, every RunMat function is open-source. Read exactly how second works, line by line, in Rust.

• View second.rs on GitHub
• Learn how the runtime works
• Found a bug? Open an issue with a minimal reproduction.

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