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SB 3.11.12

ayane cāhanī prāhur
 vatsaro dvādaśa smṛtaḥ
saṁvatsara-śataṁ nṝṇāṁ
 paramāyur nirūpitam
Synonyms: 
ayane — in the solar movement (of six months); ca — and; ahanī — a day of the demigods; prāhuḥ — it is said; vatsaraḥ — one calendar year; dvādaśa — twelve months; smṛtaḥ — is so called; saṁvatsara-śatam — one hundred years; nṝṇām — of human beings; parama-āyuḥ — duration of life; nirūpitam — is estimated.
Translation: 
Two solar movements make one day and night of the demigods, and that combination of day and night is one complete calendar year for the human being. The human being has a duration of life of one hundred years.