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How can I print a date/time without leading zeros? For example, Jul 5, 9:15.

According to the docs it uses the same syntax as strftime, however suppressing leading zeros 

time::strftime("%b %-d, %-I:%M", &time::now()).unwrap()

leads to an error:

thread '' panicked at 'called Result::unwrap() on an Err value: InvalidFormatSpecifier('-')', ../src/libcore/result.rs:746

I suspect Rust doesn't support the glibc extensions that provide this flag (and several others); however there is no syntax for non-prefixed date/time; the alternative (%l) just prefixes with blank space which is equally useless.

I could create the string by hand, but that defeats the purpose of the function.

Shepmaster
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Peter Uhnak
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  • I think the [chrono crate](https://lifthrasiir.github.io/rust-chrono/chrono/format/strftime/index.html) has support for that specifier. – squiguy Jul 05 '16 at 21:10

1 Answers1

18

Looking the code we can confirm that time crate does not support the flag -.

That said, I recommend you use the chrono crate. In addition to supporting the format specifiers you want, the chrono crate also has support for timezones and much more.

let now = chrono::Utc::now();
println!("{}", now.format("%b %-d, %-I:%M").to_string());
jhpratt
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malbarbo
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