Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 7 · Samskara Muhurtas
संस्कारमुहूर्ताः
श्रेष्ठा त्वेकादशी षष्ठी द्वादश्यन्यास्तु मध्यमाः ।कृष्णे द्वित्रिषुसंख्याश्च तिथ्योऽन्या ह्यतिनिंदिताः ॥ ३५६ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 356.
The 11th, the 6th and the 12th are best. The others are middling. In the dark fortnight, the 2nd, 3rd and 5th are allowed. The other tithis (moon days) are very bad.
Simple meaning: The 11th, 6th and 12th days are best. In the dark half, only the 2nd, 3rd and 5th are fine.
धिष्णान्यर्कत्रयांतेज्यरुद्रादित्युत्तराणि च ।
For the thread rite, good stars include Hasta, Revati, Pushya, Punarvasu, Shravana, Ashvini, Anuradha and Rohini.
जन्मभाद्दशमं कर्म संघातर्क्षं तु षोडशम् ।
Counting from the birth star, the 10th, 16th, 18th and 23rd stars are marked out.
मानसं पंचविंशर्क्षं नाचरेच्छुभमेषु तु ।
Avoid those stars. Jupiter, Mercury and Venus days are good. Moon and Sun days are middling.