Shiva Purana
काष्ठांस्त्रिंशत्कला नाम कलांस्त्रिंशन्मुहूर्तकः ॥ मुहूर्तानामपि त्रिंशदहोरात्रं प्रचक्षते ॥ ४ ॥
Thirty such Kāsthās make one Kalā. Thirty Kalās make one Muhūrta. Thirty Muhūrtas make one day.
english translation
kASThAMstriMzatkalA nAma kalAMstriMzanmuhUrtakaH ॥ muhUrtAnAmapi triMzadahorAtraM pracakSate ॥ 4 ॥
hk transliteration by Sanscript