Commmit current datetime parsing work

README.md

@@ -18,4 +18,49 @@ My first Rust project, intended to offer a simple way to display the current tim
         - `/svg/2023-06-14-3PM-CST`
         - `2023-06-14-3PM-CST.svg`
         - `/jpeg/2023.06.14.33` (14th of June, 2023, 2:33 PM UTC)
-        - `/jpeg/2023.06.14.33T-5` (14th of June, 2023, 2:33 PM UTC-5)
+        - `/jpeg/2023.06.14.33T-5` (14th of June, 2023, 2:33 PM UTC-5)
+
+## Structure
+
+1. Routing
+    - Handle different input formats at the route layer
+2. Parsing
+    - Module for parsing input
+3. Cache Layer
+    - Given all route options, provide a globally available cache for the next layer
+4. SVG Template Rendering
+    - Template rendering based on parsed input
+5. (Optional) Rasterization
+    - If rasterization is requested, render SVG to PNG
+6. (Catch-all) Error Handling
+    - All errors/panics will be caught in separate middleware
+
+## Input Parsing
+
+- Separators can be any of the following: `.`, `,`, `-`, `:` and ` `.
+    - They must be consistent through the date section and the time section (they can be different between the two).
+- Date order can be modified with `?date=[YMD|DMY|MDY]`. By default, it is `YMD`.
+- Time is not required, but will default each value to 0 (except HOUR, which is the minimum specified value).
+- Millisecond precision is allowed, but will be ignored in most outputs. Periods or commas are allowed as separators.
+- Timezones can be qualified in a number of ways, but will default to UTC if not specified.
+    - Fully qualified TZ identifiers like "America/Chicago" are specified using the `tz` query parameter.
+    - Abbreviated TZ identifiers like "CST" are specified inside the time string, after the time, separated by a dash.
+        - Abbreviated terms are incredibly ambiguous, and should be avoided if possible. For ease of use, they are
+          available, but several of them are ambiguous, and the preferred TZ has been specified in code.
+        - Full table available in [`abbr_tz`](./src/abbr_tz). Comments designated with `#`. Preferred interpretation
+          designated arbitrarily by me. Table sourced
+          from [Wikipedia](https://en.wikipedia.org/wiki/List_of_time_zone_abbreviations)
+
+```shell
+2023-06-14-3  # 3AM UTC
+2023-06-14-3-45  # 3:45AM UTC
+2023-06-14-3PM-CST
+2023.06.14.15-CST  # 3PM CST
+2023.06.14.15-45-CST  # 3:45PM CST
+2023.06.14.15-45-30-CST  # 3:45:30PM CST
+2023.06.14.15-45-30.123-CST  # 3:45:30.123PM CST
+2023.06.14.15-45-30,123-CST  # 3:45:30.123PM CST
+```
+
+## Output Formats
+