Srimad-Bhagavatam: Canto 2 - Chapter 1 - Verse 12

Sanskrit:

यावान् कल्पोविकल्पो वा यथा कालोऽनुमीयते ।भूतभव्यभवच्छब्द आयुर्मानं च यत् सत: ॥ १२ ॥

ITRANS:

yāvān kalpo vikalpo vāyathā kālo ’numīyatebhūta-bhavya-bhavac-chabdaāyur-mānaṁ ca yat sataḥ

Translation:

Also please explain the duration of time between creation and annihilation, and that of other subsidiary creations, as well as the nature of time, indicated by the sound of past, present and future. Also, please explain the duration and measurement of life of the different living beings known as the demigods, the human beings, etc., in different planets of the universe.

Purport:

Past, present and future are different features of time to indicate the duration of life for the universe and all its paraphernalia, including the different living beings in different planets.