Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
sometime [ˈsʌmtaɪm] adv (in future) когда́-нибудь; (in past)
sometime last month где́-то в про́шлом ме́сяце
I'll finish it sometime когда́-нибудь я э́то зако́нчу
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: