diff --git a/parser/src/json/formats.rs b/parser/src/json/formats.rs
index 7ee7ee2..b0c3d83 100644
--- a/parser/src/json/formats.rs
+++ b/parser/src/json/formats.rs
@@ -1,12 +1,31 @@
 pub fn lookup_format(name: &str) -> Option<&str> {
     let r = match name {
-        "date-time" => {
-            r"^(?P<date>[0-9]{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12][0-9]|3[01]))[tT](?P<time>(?:[01][0-9]|2[0-3]):[0-5][0-9]:(?:[0-5][0-9]|60)(?P<time_fraction>\.[0-9]+)?(?P<time_zone>[zZ]|[+-](?:[01][0-9]|2[0-3]):[0-5][0-9]))$"
-        }
+        "date-time" => concat!(
+            r"^(?P<date>",
+            r"[0-9]{4}-(?:",
+            r"(?:0[13578]|1[02])-(?:0[1-9]|[12][0-9]|3[01])|", // 31-day months
+            r"(?:0[469]|11)-(?:0[1-9]|[12][0-9]|30)|",         // 30-day months
+            r"(?:02)-(?:0[1-9]|1[0-9]|2[0-9])",                // February up to 29 days
+            r"))",
+            r"[tT](?P<time>",
+            r"(?:[01][0-9]|2[0-3]):[0-5][0-9]:", // Hours, Minutes
+            r"(?:[0-5][0-9]|60)",                // Seconds (including leap second 60)
+            r"(?P<time_fraction>\.[0-9]+)?",     // Optional fractional seconds
+            r"(?P<time_zone>",
+            r"[zZ]|[+-](?:[01][0-9]|2[0-3]):[0-5][0-9]", // Time zone
+            r")",
+            r")$"
+        ),
         "time" => {
             r"^(?:[01][0-9]|2[0-3]):[0-5][0-9]:(?:[0-5][0-9]|60)(?P<time_fraction>\.[0-9]+)?(?P<time_zone>[zZ]|[+-](?:[01][0-9]|2[0-3]):[0-5][0-9])$"
         }
-        "date" => r"^[0-9]{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12][0-9]|3[01])$",
+        "date" => concat!(
+            r"^(?:",
+            r"(?:[0-9]{4}-(?:0[13578]|1[02])-(?:0[1-9]|[12][0-9]|3[01]))|", // Months with 31 days
+            r"(?:[0-9]{4}-(?:0[469]|11)-(?:0[1-9]|[12][0-9]|30))|",         // Months with 30 days
+            r"(?:[0-9]{4}-02-(?:0[1-9]|1[0-9]|2[0-9]))", // February with up to 29 days
+            r")$"
+        ),
         "duration" => {
             r"^P(?:(?P<dur_date>(?:(?P<dur_year>[0-9]+Y(?:[0-9]+M(?:[0-9]+D)?)?)|(?P<dur_month>[0-9]+M(?:[0-9]+D)?)|(?P<dur_day>[0-9]+D))(?:T(?:(?P<dur_hour>[0-9]+H(?:[0-9]+M(?:[0-9]+S)?)?)|(?P<dur_minute>[0-9]+M(?:[0-9]+S)?)|(?P<dur_second>[0-9]+S)))?)|(?P<dur_time>T(?:(?P<dur_hour2>[0-9]+H(?:[0-9]+M(?:[0-9]+S)?)?)|(?P<dur_minute2>[0-9]+M(?:[0-9]+S)?)|(?P<dur_second2>[0-9]+S)))|(?P<dur_week>[0-9]+W))$"
         }