True for PC - there's a time counter in the Consecutive Days window in the center - mind the green or red tabs!
On mobile, it's a tad difficult. The CDP screen will show up once a day, and once when you achieve the next CDP bonus. It contains the clock, but instead of the tabs, the status is shown in colour shading.
Independently, you'll see it on your watch. You have to know the time offset to UTC = Zulu = GMT, because 12 am UTC is the CDP reference. It's not that difficult: Add the offset of your time zone to 12 am, that's your personal deadline. Mind you that US time zones are negative, from -5 (ET) to -9 (AKST), so you'll end up in early to late afternoon, e.g. 7 pm in New York. Also, mind DST, altering the numbers!
If in doubt, just play one shot of any solo game at a fixed time of day and away from a full hour - you can't do more!