day's luck; auspiciousness of a day
Refers to the traditional belief that each day has a certain fortune or quality, often considered in scheduling events. Commonly used in phrases like 日柄が良い/悪い.
We chose a day with good luck for the wedding date.
Today is an unlucky day, so let's do important things tomorrow.
Compound of 日 (hi, 'day') and 柄 (gara, 'pattern' or 'nature'), literally meaning 'the nature of a day'. The reading ひがら is a standard kun'yomi combination.