Geotime

Geotime provides a 128-bit signed integer timestamp compatible with Unix time_t and anchored at the Unix epoch. See the documentation here.

use geotime::Geotime;

let dt = Geotime::from(0);
assert_eq!(dt.display_string("%Y-%m-%d"), "1970-01-01");

let dt = Geotime::from((i64::MAX as i128) + 1);
assert_eq!(dt.display_string("%Y"), "299.87 M years from now");

let dt = Geotime::from(-(i64::MAX as i128) * 100);
assert_eq!(dt.display_string("%Y"), "29.99 B years ago");