Progress on Time parser

src/time/parser.rs

@@ -193,15 +193,67 @@ impl<'a> Parser<'a> {
             Format::Basic => self.text.get(13..15),
             Format::Extended => self.text.get(17..19),
         };
-        todo!()
+        if let Some(s) = second {
+            let second = match s.parse() {
+                Ok(s) => s,
+                Err(_) => {
+                    self.mode = Mode::TimeZone;
+                    return Ok(());
+                }
+            };
+            if second > 60 {
+                return Err(Error::InvalidSecond);
+            }
+            self.second = Some(second);
+        }
+        self.mode = Mode::TimeZone;
+        Ok(())
     }
 
     fn parse_timezone(&mut self) -> Result<(), Error> {
         assert_eq!(self.mode, Mode::TimeZone);
-        let tz = match self.format {
-            Format::Basic => self.text.get(15..),
-            Format::Extended => self.text.get(19..),
+        let idx = if self.second.is_some() {
+            match self.format {
+                Format::Basic => 17,
+                Format::Extended => 21,
+            }
+        } else if self.minute.is_some() {
+            match self.format {
+                Format::Basic => 15,
+                Format::Extended => 19,
+            }
+        } else if self.hour.is_some() {
+            match self.format {
+                Format::Basic => 13,
+                Format::Extended => 16,
+            }
+        } else if self.day.is_some() {
+            match self.format {
+                Format::Basic => 9,
+                Format::Extended => 11,
+            }
+        } else if self.month.is_some() {
+            match self.format {
+                Format::Basic => 6,
+                Format::Extended => 8,
+            }
+        } else {
+            4
         };
+        match self.text.chars().nth(idx) {
+            Some('Z') => {
+                if self.text.len() > idx + 2 {
+                    return Err(Error::TrailingGarbage);
+                } else {
+                    self.tz = Some(TimeZone::UTC);
+                    return Ok(());
+                }
+            },
+            Some('-') => todo!(),
+            Some('+') => todo!(),
+            None => self.mode = Mode::Finish,
+            _ => return Err(Error::InvalidTimezone),
+        }
         todo!()
     }