To save you trouble in the future. If you need to ask just assume iOS can't do that. Lol
I have to ask though, since time zones vary per hour and you only want to have 2 (assuming 1 is your current time) do you actually need it?
I have family in a different time zone that is 3 hours behind me. I've never wondered what time it was there since the math is well....second nature easy.... Benefit of the doubt I guess, if you were used to it in Android it would annoying to not have it now so that reasonable.
What security concerns do you have? Swiping right to your widgets shouldn't reveal too much sensitive information (its information anyone that can get your phone could access btw), you could put the time and something else at the top so its all that is seen be people looking over your shoulder. Or you could just ask Siri if you have it enabled from the lock screen.
Hope this helps some.
EDIT: Re read this, I don't mean to sound snarky about doing the math. Added the benefit of the doubt.