This PR is the preparation of the #2946 issue.
(Date.parse() should handle UTC date string format)
Changes:
- Handle min/max values in ecma_date_parse_date_chars function instead of code duplication
- Parse special characters in the new ecma_date_parse_special_char function
- Additionally fixed two parsing issue: invalid formats should be refused
JerryScript-DCO-1.0-Signed-off-by: Csaba Osztrogonác [email protected]