Kalpa

Kalpa is also a time frame.  as we already knew about the 14 manvantaras. the time taken to complete these 14 manvantaras is called kalpa, which is same as a day of Bhagavan Brahma

i.e., Kalpa = 14 manvantaras = 1 day for Brahma

for our convenience it was said that even Brahma has 30 days for a month. And even each day of his month was named according to Matsya purana as below.

1. swetha 
2. Neelalohitha
3. Vaama deva 
4. Ratnamtara
5. Rourava
6. Deva
7. Bruhat
8. kamdarpa
9. sadhya 
10. eesaana
11. tamoo
12. saaraswatha
13. udaana
14. garuda
15. koura
16. naarasimha 
17. samaana
18. agneya 
19. soma 
20. maanava
21. tatsumaana
22. vaikuntha
23. lakshmi
24. saavithri 
25. aghora
26. varaaha
27. vairaaja
28. gouri
29. maheswara
30. pitru 

If you would like to read the same in తెలుగు click here.