Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
क्रकचो नाम योगोऽयं मंगलेष्वतिगर्हितः ।सप्तम्यामर्कवारश्चेत्प्रतिपत्सौम्यवासरे ॥ २३६ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 236.
This yoga (good or bad day mix) is named Krakacha. It is very much condemned in good acts. Say Sunday falls on the 7th tithi (moon day), or the 1st tithi on Wednesday...
Simple meaning: Tithi plus weekday making 13 is Krakacha, very bad. Sunday on the 7th or Wednesday on the 1st opens another.
संवतयोगो विज्ञेयः शुभकर्मविनाशकृत् ।
Those two pairs make Samvata, which can spoil good acts. The list of 28 day mixes begins with Ananda.
ध्वांक्षध्वजाख्यश्रीवत्सवज्रमुद्गरछत्रकाः ।
The list of day mixes goes on with twelve more names.
काणसिद्धिशुभा मृत्युमुशलांतककुंजराः ।
The list of twenty-eight day mixes ends with these eleven names.