With respect to the car, you have to treat the transaction as an outright sale; you can no longer use like-kind exchange treatment after tax reform (the TCJA).
The time period varies but is usually less than 90 days (in most cases within 30-60 days).
With respect to the effective date, refer to the information at the link below.
https://www.irs.gov/instructions/i2553#idm139855003794080
