DateSelect

DateSelect[list, crit] picks out all dates datei of a list for which crit[datei] is True.

DateSelect[int, crit] returns all dates within the DateInterval int for which crit[datei] is True.

DateSelect[crit] represents an operator form of DateSelect that can be applied to an expression.

Examples

Select weekends from a date range:

dates = DateRange[{2024, 1, 1}, {2024, 1, 14}];
DateSelect[dates, DayName[#] === Saturday || DayName[#] === Sunday &]

Select Mondays:

DateSelect[dates, DayName[#] === Monday &]

Please visit the official Wolfram Language Reference for more details.