From 8f2ece2b01e93097745e5d47a9a1aaa1242dbc2b Mon Sep 17 00:00:00 2001
From: KAMADA Ken'ichi <kamada@nanohz.org>
Date: Sat, 17 Jun 2017 21:43:59 +0900
Subject: [PATCH] Implement std::fmt::Display trait for DateTime.

---
 src/tiff.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/tiff.rs b/src/tiff.rs
index 043a93d..cc4c826 100644
--- a/src/tiff.rs
+++ b/src/tiff.rs
@@ -24,6 +24,8 @@
 // SUCH DAMAGE.
 //
 
+use std::fmt;
+
 use endian::{Endian, BigEndian, LittleEndian};
 use error::Error;
 use tag;
@@ -157,6 +159,14 @@ pub fn is_tiff(buf: &[u8]) -> bool {
 }
 
 /// A struct used to parse a DateTime field.
+///
+/// # Examples
+/// ```
+/// use exif::DateTime;
+/// let dt = DateTime::from_ascii(b"2016:05:04 03:02:01").unwrap();
+/// assert_eq!(dt.year, 2016);
+/// assert_eq!(format!("{}", dt), "2016-05-04 03:02:01");
+/// ```
 #[derive(Debug)]
 pub struct DateTime {
     pub year: u16,
@@ -190,6 +200,14 @@ impl DateTime {
     }
 }
 
+impl fmt::Display for DateTime {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{:04}-{:02}-{:02} {:02}:{:02}:{:02}",
+               self.year, self.month, self.day,
+               self.hour, self.minute, self.second)
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;