adjust date time regex checks

now the year 838438 and sub-second measurements are allowed

Author: mmichaelb

redshift/resource_redshift_user.go

@@ -330,8 +330,8 @@ func resourceRedshiftUserReadImpl(db *DBConnection, d *schema.ResourceData) erro
 
 const redshiftDataApiInfinityDateString = "2038-01-19 03:14:04"
 
-var redshiftDataApiDatetimeRegexp = regexp.MustCompile(`^\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}$`)
-var correctDatetimeRegexp = regexp.MustCompile(`^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\+00$`)
+var redshiftDataApiDatetimeRegexp = regexp.MustCompile(`^\d+-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$`)
+var correctDatetimeRegexp = regexp.MustCompile(`^\d+-\d{2}-\d{2} \d{2}:\d{2}:\d{2}(\.\d+)?\+00$`)
 
 func validateAndAdjustValidUntil(validUntil string) (string, error) {
 	if validUntil == redshiftDataApiInfinityDateString {

redshift/resource_redshift_user_test.go

@@ -573,6 +573,14 @@ func Test_validateAndAdjustValidUntil(t *testing.T) {
 			want:    "2025-08-06 17:22:56+00",
 			wantErr: false,
 		},
+		{
+			name: "does not add suffix to correct datetime with sub-second check",
+			args: args{
+				validUntil: "2025-08-06 17:22:56.0+00",
+			},
+			want:    "2025-08-06 17:22:56.0+00",
+			wantErr: false,
+		},
 		{
 			name: "returns error for invalid timezone",
 			args: args{