Manusmriti
इतरेषु ससन्ध्येषु ससन्ध्यांशेषु च त्रिषु । एकापायेन वर्तन्ते सहस्राणि शतानि च ॥ ७० ॥
In the other three ages with their twilights preceding and following, the thousands and hundreds are diminished by one (in each)
english translation
itareSu sasandhyeSu sasandhyAMzeSu ca triSu । ekApAyena vartante sahasrANi zatAni ca ॥ 70 ॥
hk transliteration by Sanscript