What is the mean of block mined time

My pool mined a block #233979 which is found in 2017-12-10 06:24:48 CST

And my zcash wallet get this block in 2017-12-09 22:24:48

But in zcash explorer, it looks it is mined by Dec 10, 2017 6:24:02 AM, I donot know why so big difference between these two time, please help me,thank you