diff --git a/timeutils.nim b/timeutils.nim
index 002c57a..8d8674d 100644
--- a/timeutils.nim
+++ b/timeutils.nim
@@ -1,7 +1,11 @@
 import times
 
 const zeroTime = fromUnix(0)
-const ISO_8601_FULL_FORMAT = "yyyy-MM-dd'T'HH:mm:sszzz"
+const ISO_8601_FORMATS = @[
+  "yyyy-MM-dd'T'HH:mm:ssz",
+  "yyyy-MM-dd'T'HH:mm:sszzz",
+  "yyyy-MM-dd'T'HH:mm:ss'.'fffzzz"
+]
 
 proc format*(ti: TimeInterval, fmt: string): string =
   let info = (fromUnix(0) + ti).utc
@@ -48,10 +52,14 @@ proc startOfWeek*(ti: DateTime, startDay = dMon): DateTime =
   return (ti - diff.days).startOfDay
 
 proc parseIso8601*(val: string): DateTime =
-  return val.parse(ISO_8601_FULL_FORMAT)
+  var errString = ""
+  for df in ISO_8601_FORMATS:
+    try: return val.parse(df)
+    except: errString &= "\n" & getCurrentExceptionMsg()
+  raise newException(Exception, "Could not parse date. Tried:" & errString)
 
 proc formatIso8601*(d: DateTime): string =
-  return d.format(ISO_8601_FULL_FORMAT)
+  return d.format(ISO_8601_FORMATS[2])
 
 # This is a workaround needed due a bug in Nim's times.parse procedure.
 # see: https://github.com/nim-lang/Nim/issues/4922
diff --git a/timeutils.nimble b/timeutils.nimble
index 9d4e769..bf01b76 100644
--- a/timeutils.nimble
+++ b/timeutils.nimble
@@ -1,6 +1,6 @@
 # Package
 
-version       = "0.4.0"
+version       = "0.5.0"
 author        = "Jonathan Bernard"
 description   = "Utility methods to fill in the lacking time support in Nim\'s stdlib. This is holding me over until I can write a proper time module for the stdlib and submit it."
 license       = "BSD3"