Daniel 1 21
So Daniel served the king until the first year that Cyrus was king.
Compare with other 3 random translations
YLT Daniel 1:21And Daniel is unto the first year of Cyrus the king.
ASV Daniel 1:21And Daniel continued even unto the first year of king Cyrus.
GNV Daniel 1:21And Daniel was vnto the first yeere of king Cyrus.