That's what I was thinking, but not sure as I dont have any reference nor someone to share the idea, since I'm not an expert of this.
The problem began when I had a coordinate in China presented like below:
Coordinate Using WGS-84:
122deg 6.406minute East (41 414 342 m)
30deg 36.37minute North (3 387 652 m)
I assumed the values between the brackets are the UTM coordinate, and I tried to check it. I put the latitude-longitude values above in CoordTrans using datum WGS-84, and the easting-northing result were:
414 376.43 m
3 386 298.83 m
By using other software I got the same result of easting/northing values.
Just for another check, when I tried to do the vice versa, (as I expected) both softwares showed the coordinate was not even in China. That's why I came with the conclusion that these easting-northing values (shown between the brackets above) were incorrect. Do you agree with me?