# `compile-time`
[](https://crates.io/crates/compile-time)
[](https://docs.rs/compile-time)
This crate provides macros for getting compile time information.
You can get the compile time either as `time::Date`, `time::Time`,
`time::OffsetDateTime`, string, or UNIX timestamp.
You can get the Rust compiler version either as `semver::Version` or string,
and the individual version parts as integer literals or strings, respectively.
You can run arbitrary command at compile time and get its output as bytes or string.
# Examples
Getting the compile time and Rust version:
```rust
const COMPILE_DATETIME: &str = compile_time::datetime_str!();
const RUSTC_VERSION: &str = compile_time::rustc_version_str!();
println!("Compiled using Rust {RUSTC_VERSION} on {COMPILE_DATETIME}.");
```
Running an arbitrary command at compile time:
```rust
const MAGIC_NUMBER: &str = compile_time::command_str!("echo", "42");
assert_eq!(MAGIC_NUMBER, "42\n");
```