Shiva Purana

siva.sh/siva-purana/uma-samhita/27/3

तेन ज्ञात्वा दिनं योगी प्राणायामपरः स्थितः ।। स जयत्यागतं कालं मासार्द्धेनैव सुंदरि ।। ३ ।।

sanskrit

Knowing the day through that, the Yogin stays engaged in Prāṇāyāma. O pretty woman, within half a month he conquers the Kāla that has already come upon him.

english translation

tena jJAtvA dinaM yogI prANAyAmaparaH sthitaH || sa jayatyAgataM kAlaM mAsArddhenaiva suMdari || 3 ||

hk transliteration by Sanscript