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# runtime-format
Formatting, but processed at runtime.
```rust
use runtime_format::{FormatArgs, FormatKey, FormatKeyError};
use core::fmt;
impl FormatKey for DateTime {
fn fmt(&self, key: &str, f: &mut fmt::Formatter<'_>) -> Result<(), FormatKeyError> {
use core::fmt::Write;
match key {
"year" => write!(f, "{}", self.year()).map_err(FormatKeyError::Fmt),
"month" => write!(f, "{}", self.short_month_name()).map_err(FormatKeyError::Fmt),
"day" => write!(f, "{}", self.day()).map_err(FormatKeyError::Fmt),
"hours" => write!(f, "{}", self.hours()).map_err(FormatKeyError::Fmt),
"minutes" => write!(f, "{}", self.minutes()).map_err(FormatKeyError::Fmt),
"seconds" => write!(f, "{}", self.seconds()).map_err(FormatKeyError::Fmt),
_ => Err(FormatKeyError::UnknownKey),
}
}
}
let now = DateTime::now();
let fmt = "{month} {day} {year} {hours}:{minutes}:{seconds}";
let args = FormatArgs::new(fmt, &now);
// Outputs "Jan 25 2023 16:27:53"
println!("{args}");
```
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