SB 2.10.47

How time is perceived, which is part of the question, will be answered in detail later. The measurement of time has a form described in terms of kalpas. Without the qualities of kalpa and other subdivisions, time cannot be measured. That will be described later (purastād) in the Third Canto. The Pādma-kalpa is included in the first half of Brahmā’s life. The list of kalpas or days of Brahmā’s month is mentioned in the Skanda Purāṇa. prathamaḥ śveta-kalpas tu dvitīyo nīla-lohitaḥ | vāmadevas tṛtīyas tu tato gāthāntaro paraḥ || rauravaḥ paṣcamaḥ proktaḥ ṣaṣṭhaḥ prāṇa iti smṛtaḥ | saptamo ’tha bṛhat-kalpaḥ kandarpo ’ṣṭama ucyate || satyo ’tha navamaḥ prokta īśāno daśamaḥ smṛtaḥ | dhyāna ekādaśaḥ proktas tathā sārasvato ’paraḥ || trayodaśa udānas tu gāruḍo ’tha caturdaśaḥ | kaurmaḥ paṣcadaśo jṣeyaḥ paurṇamāsī prajāpateḥ || ṣoḍaśo nārasiṁhas tu samādhis tu tato ’paraḥ | āgneyo viṣṇujaḥ sauraḥ soma-kalpas tato ’paraḥ || dvāviṁśo bhāvanaḥ proktaḥ supumān iti cāparaḥ | vaikuṇṭhaś cārciṣas tadvat vallī-kalpas tato ’paraḥ || saptaviṁśo ’tha vairājo gaurī-kalpas tathāparaḥ | māheśvaras tathā proktas tripuro yatra ghātitaḥ || pitṛ-kalpas tathā cānte yaḥ kuhūr brahmaṇaḥ smṛtaḥ | triṁśat kalpāḥ samākhyātā brahmaṇo divasaiḥ sadā || atītāś ca bhaviṣyāś ca vārāho vartate ’dhunā | pratipad brahmaṇaḥ proktā dvitīyārdhasya sāmpratam || The first day of the month is called Śveta-kalpa. The second is Nīla-lohita. The third is Vāmadeva and the fourth is called Gāthāntara. The fifth is Raurava, the sixth is Prāṇa. The seventh is Bṛhat and the eighth is Kandarpa. The ninth is Savya and the tenth is Īśāna. The eleventh is Dhyāna and the twelfth is Sārasvata. The thirteenth is Udāna and the fourtheen is Garuḍa. The fifteenth is Kaurma. This is the full moon of Brahmā. The sixteenth day is Nārasiṁha and the seventeenth is Samādhi. The eighteenth is Āgneya and the nineteenth is Viṣṇuja. The twentieth is Saura and the twenty-first day is called Soma. The twenty-second day is called Bhāvana and the twenty-third is Supumān. The twenty-fourth is Vaikuṇṭha and the twenty-fifth is Arcīṣa. The twenty–sixth is Vallī and the twenty-seventh is Vairāja. The twenty-eighth is Gaurī and the twenty-ninth is Māheśvara. In this kalpa Śiva destroys Tripura. The last day of the month is called Pitṛ-kalpa. This is the dark moon of Brahmā’s month. These kalpas are known as the days of Brahmā and have existed in the past and will exist in the future. The present kalpa is the Varāha kalpa, the first day of the first month in the second half of Brahmā’s life. Śvetaḥ refers to the Śveta-vārāha-kalpa. That is also the present Vārāha-kalpa. The first day after Brahmā is born is called Brāhma-kalpa. The last day of the month or Pitṛ-kalpa at the end of the first half of Brahmā’s life is called the Pādma-kalpa, since the planets take the shape of a lotus during that day.