Function yymmdd 

pub fn yymmdd(timestamp: i64, separator: Option<&str>) -> Result<String, Error>

Formats a timestamp as “yy-MM-dd”

This function now includes validation using TimestampUtils::validate_timestamp().

Arguments

• timestamp - Timestamp in milliseconds since Unix epoch
• separator - Optional separator between year, month, day (defaults to “”)

Example

use ccxt_core::time::yymmdd;

let ts = 1704110400000;
let formatted = yymmdd(ts, None).unwrap();
assert_eq!(formatted, "240101");

let formatted_dash = yymmdd(ts, Some("-")).unwrap();
assert_eq!(formatted_dash, "24-01-01");