Shiva Purana
न तत्रापि युगावस्था यथास्थानेषु सप्तसु ॥ त्रेतायुगसमः कालस्सर्वदैव महामुने ॥ २९॥
In all the seven subdivisions in it there is no differentiation among the various Yugas. O great sage, the time there is on a par with Tretā Yuga for ever.
english translation
na tatrApi yugAvasthA yathAsthAneSu saptasu ॥ tretAyugasamaH kAlassarvadaiva mahAmune ॥ 29॥
hk transliteration by Sanscript