implement custom timestamp formats for resources, resolves #15

src/util.rs

@@ -2,6 +2,8 @@
 
 use std::path::Path;
 
+use time::OffsetDateTime;
+
 /// Simple helper to remove the contents of a directory without removing the directory itself.
 pub fn remove_dir_contents(path: &Path) -> eyre::Result<()> {
 	for entry in path.read_dir()? {
@@ -16,3 +18,9 @@ pub fn remove_dir_contents(path: &Path) -> eyre::Result<()> {
 
 	Ok(())
 }
+
+/// Helper to format a timestamp according to the given format.
+pub fn format_timestamp(ts: OffsetDateTime, format: &str) -> eyre::Result<String> {
+	let fmt = time::format_description::parse_borrowed::<2>(format)?;
+	Ok(ts.format(&fmt)?)
+}