Charak Samhita
ऋत्वहोरात्रदोषाणां मनसश्च बलाबलात्। कालमर्थवशाच्चैव ज्वरस्तं तं प्रपद्यते ॥७५॥
[Dhatugata jwara] Manifestation of jwara at a particular time or a change in the time of manifestation takes place due to following factors: Jwara occurs according to the strength or weakness of factors like dosha, seasons, day, night, mental status and artha (deeds of previous life).
english translation
RtvahorAtradoSANAM manasazca balAbalAt। kAlamarthavazAccaiva jvarastaM taM prapadyate ॥75॥
hk transliteration by Sanscript