Here are the January 2017 Amavasya Tharpanam Sankalpam Mantras for Bodhayana Amavasya and Sarva Amavasya. 21 January 2017 is Sarva Amavasya.
21 January 2017 is – Pushya Amavasya, Magha Amavasya, Thai Amavasai and Makara masa Amavasya as per Amavasyant Chandramana Panchang, North Indian Hindi calendars, Tamil and Malayalam calendars respectively.
21 January 2017 – Sarva Amavasya
Durmukhinama samvathsare ,Utharayane , hemantha rithou, makara mase , Krishna pakshe, adhya amavasyam punya thidhou , Shukra (brugu) vasara yukthayam, Uthrashada nakshatra yukthayam, shubhayoga, shubhaKarana evam guna viseshena, visishtayam asyam amavasyam punya thidhou, amavasya punyakale, darsa sradham , thilatharpana roopena adhya karishye
(Amavasya up till 5.38 Am next morning (Prathama afterwards) and Uthrashada Nakshtra up to 9.50 PM (afterwards Sravana)).