Further fix for ISO8601 date parsing.

Recognize versions of timestamps with 'T' as the date/time separator.
For example, compare:

    '2021-08-01 23:14:00-05:00'
    '2021-08-01T23:14:00-05:00'

This commit adds support for the second flavor (and it's variations).

fiber_orm.nimble

@@ -1,6 +1,6 @@
 # Package
 
-version       = "0.3.1"
+version       = "0.3.3"
 author        = "Jonathan Bernard"
 description   = "Lightweight Postgres ORM for Nim."
 license       = "GPL-3.0"

src/fiber_orm/util.nim

@@ -67,34 +67,38 @@ proc parsePGDatetime*(val: string): DateTime =
 
   const PG_TIMESTAMP_FORMATS = [
     "yyyy-MM-dd HH:mm:ss",
+    "yyyy-MM-dd'T'HH:mm:ss",
     "yyyy-MM-dd HH:mm:sszz",
+    "yyyy-MM-dd'T'HH:mm:sszz",
     "yyyy-MM-dd HH:mm:ss'.'fff",
-    "yyyy-MM-dd HH:mm:ss'.'fffzz"
+    "yyyy-MM-dd'T'HH:mm:ss'.'fff",
+    "yyyy-MM-dd HH:mm:ss'.'fffzz",
+    "yyyy-MM-dd'T'HH:mm:ss'.'fffzz",
+    "yyyy-MM-dd HH:mm:ss'.'fffzzz",
+    "yyyy-MM-dd'T'HH:mm:ss'.'fffzzz",
   ]
 
-  let PG_PARTIAL_FORMAT_REGEX = re"(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.)(\d{1,3})(\S+)?"
-
-  var errStr = ""
-
-  # Try to parse directly using known format strings.
-  for df in PG_TIMESTAMP_FORMATS:
-    try: return val.parse(df)
-    except: errStr &= "\n\t" & getCurrentExceptionMsg()
+  var correctedVal = val;
 
   # PostgreSQL will truncate any trailing 0's in the millisecond value leading
   # to values like `2020-01-01 16:42.3+00`. This cannot currently be parsed by
   # the standard times format as it expects exactly three digits for
   # millisecond values. So we have to detect this and pad out the millisecond
   # value to 3 digits.
+  let PG_PARTIAL_FORMAT_REGEX = re"(\d{4}-\d{2}-\d{2}( |'T')\d{2}:\d{2}:\d{2}\.)(\d{1,2})(\S+)?"
   let match = val.match(PG_PARTIAL_FORMAT_REGEX)
+
   if match.isSome:
     let c = match.get.captures
-    try:
-      let corrected = c[0] & alignLeft(c[1], 3, '0') & c[2]
-      return corrected.parse(PG_TIMESTAMP_FORMATS[1])
-    except:
-      errStr &= "\n\t" & PG_TIMESTAMP_FORMATS[1] &
-        " after padding out milliseconds to full 3-digits"
+    if c.toSeq.len == 2: correctedVal = c[0] & alignLeft(c[2], 3, '0')
+    else: correctedVal = c[0] & alignLeft(c[2], 3, '0') & c[3]
+
+  var errStr = ""
+
+  # Try to parse directly using known format strings.
+  for df in PG_TIMESTAMP_FORMATS:
+    try: return correctedVal.parse(df)
+    except: errStr &= "\n\t" & getCurrentExceptionMsg()
 
   raise newException(ValueError, "Cannot parse PG date. Tried:" & errStr)