seems to work

main.rs

@@ -3,8 +3,23 @@ use std::fs; // To list files
 use std::fs::File;
 use std::io::BufReader;
 use std::io::BufRead;
+use std::process::Command;
 
-fn birthdate (filename: String) -> String {
+/* Execute notify program */
+fn notify (text: &String) {
+    if cfg!(target_os = "windows") {
+        println!("OS not suported");
+    } else {
+        let _ = Command::new("notify-send")
+                .arg("Anniversaires")
+                .arg(text)
+                .output()
+                .expect("failed to execute process");
+    }
+}
+
+/* Extract birthdate String from vcf file */
+fn birthdate (filename: &String) -> String {
     let file = File::open(filename).expect("file not found!");
     let reader = BufReader::new(file);
     for line in reader.lines() {
@@ -16,24 +31,65 @@ fn birthdate (filename: String) -> String {
     return "".to_string()
 }
 
+/* Extract full name from vcf file */
+fn fullname (filename: &String) -> String {
+    let file = File::open(filename).expect("file not found!");
+    let reader = BufReader::new(file);
+    for line in reader.lines() {
+        let l:String = line.unwrap();
+        if l.starts_with("FN:") {
+            return l[3..].to_string();
+        }
+    }
+    return "".to_string()
+}
+
+/* Test if date a is before b in civil year */
+fn before_in_civil_year (a :&NaiveDate, b: &NaiveDate) -> bool{
+    a.month()*100 + a.day() < b.month()*100 + b.day()
+}
+
 fn main() {
     /* Where are the vcf files */
     let vcf_dir = "/home/ilya/.contacts/contacts";
     
     /* How much day before */
-    let delta_d:u8 = 10;
+    let delta_d = 10;
     
-    let now = Local::now();
+    let tz_today = Local::today();
+    let today = NaiveDate::from_ymd(tz_today.year(), tz_today.month(), tz_today.day());
 
     let paths = fs::read_dir(vcf_dir).unwrap();
+    let mut output:String = "".to_string();
+
     for path in paths {
+        /* Get date string from vcf file */
         let filename :String = path.unwrap().path().into_os_string().into_string().unwrap();
-        let bdate:String = birthdate(filename);
+        let bdate:String = birthdate(&filename);
         if bdate == "" {
             continue
         }
-        //println!("{}", bdate);
-        println!("{}",UTC::Date(bdate));
 
+        /* Parse the date */
+        let mut date = match bdate.len() {
+            8  => Some(NaiveDate::parse_from_str(&bdate.to_string(), "%Y%m%d").unwrap()),
+            10 => Some(NaiveDate::parse_from_str(&bdate.to_string(), "%Y-%m-%d").unwrap()),
+            _  => None,
+        }.expect("Date is of no known format");
+
+        /* set to y+1 to make it a future date, or to y */
+        if before_in_civil_year(&date, &today) {
+            date = date.with_year(today.year()+1).unwrap()
+        } else {
+            date = date.with_year(today.year()).unwrap()
+        }
+        
+        let bdate = UTC.from_local_date(&date).single().unwrap();
+        
+        /* It is time to be alerted */
+        if bdate.num_days_from_ce() - tz_today.num_days_from_ce() <= delta_d {
+            output = format!("{}{}/{} {}\n", output, date.day(), date.month(), fullname(&filename));
         }
     }
+    notify(&output);
+}