How to convert timestamp into datetime in a rust canister?

Developers
2

Great thanks to @oepnchat
Solved by learning from openchat codebase:

use time::OffsetDateTime;
pub fn timestamp_to_date(timestamp_ns: u64) -> String {
//ic_cdk::api::time() returns ns of timestamp
  let timestamp_s = timestamp_ns / 1_000_000_000;
// core funtion here : from_unix_timestamp()
  let date = OffsetDateTime::from_unix_timestamp(timestamp_s as i64).unwrap();
  format!(
    "{:04}_{:02}_{:02}_{:02}_{:02}_{:02}",
    date.year(),
    date.month()as u32,
    date.day(),
    date.hour(),
    date.minute(),
    date.second()
  )
}
//return example:  2024_02_18_06_07_59
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