Those that know all about the Time say that you are the beginning and the end of the Brahma day which consists of full one thousand Yugas.
यदहर्ब्रह्मणः प्रोक्तं सहस्रयुगसम्मितम्। तस्य त्वमादिरन्तश्च कालज्ञैः परिकीर्तितः॥