I contributed to a Roth IRA in 2016, but recharacterized it as a nondeductible traditional IRA contribution in 2017. How do I enter this in TurboTax?

I contributed to a Roth IRA in 2016, but then recharacterized it as a nondeductible traditional IRA contribution in 2017. When entering the traditional IRA contribution info into TurboTax, what do I put down for 'How much of the above total contribution was between January 1, 2017 and April 18, 2017?'