Definition
This phrase is used to indicate that the truth or the outcome of a situation will only become clear at a later time, after events have unfolded.
日久见人心
Whether this new policy will be effective, only time will tell.
这项新政策是否有效，只有时间能证明。
It's too early to say whether they'll be successful; only time will tell.
现在说他们是否会成功还为时过早；只有时间能证明。
Only time will tell if this investment was a wise decision.
这项投资是否明智，只有时间能证明。