Due to a recent announcement by the IRS, you now have more time to prepare your 2017 ACA filings.
On 12/22/17 the IRS released notice 2018-06 extending the 2017 tax year ACA filing deadline for distribution of form 1095 to employees from 1/31/18 to 3/02/18.
The 30-day extension is automatic, so you do not have to request it. However, the timeframe for filing 2017 forms with the IRS remains the same. For 2018, these due dates are February 28 for paper filers and April 2 for electronic filers. If you file more than 250 forms, you are required to e-file.