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Trayodashi is the Sanskrit word for "thirteen", and is the thirteenth day in the lunar fortnight (Paksha) of the Hindu calendar. Each month has two Thrayodashi days, being the thirteenth day of the "bright" (Shukla) and of the "dark" (Krishna) fortnights respectively. Thus Thrayodashi occurs on the thirteenth and the twenty-eighth day of each month.
- Aurobinda Prasad Gayan (17 October 2017). "Happy Dhanteras! But is it really a good day to buy gold?". Economic Times. Retrieved 19 October 2017.