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.
日久見人心
Whether this new policy will be effective, only time will tell.
這項新政策是否有效，只有時間能證明。
It's too early to say whether they'll be successful; only time will tell.
現在說他們是否會成功還為時過早；只有時間能證明。
Only time will tell if this investment was a wise decision.
這項投資是否明智，只有時間能證明。