document util crate

src/util/time.rs

@@ -1,6 +1,8 @@
+//! Module containing helper functions to manipulate time
 use chrono::{SecondsFormat, TimeZone, Utc};
 use std::time::{SystemTime, UNIX_EPOCH};
 
+/// Returns milliseconds since UNIX Epoch
 pub fn now_msec() -> u64 {
 	SystemTime::now()
 		.duration_since(UNIX_EPOCH)
@@ -8,6 +10,8 @@ pub fn now_msec() -> u64 {
 		.as_millis() as u64
 }
 
+/// Convert a timestamp represented as milliseconds since UNIX Epoch to
+/// its RFC3339 representation, such as "2021-01-01T12:30:00Z"
 pub fn msec_to_rfc3339(msecs: u64) -> String {
 	let secs = msecs as i64 / 1000;
 	let nanos = (msecs as i64 % 1000) as u32 * 1_000_000;