freq : {freq_spec}
Frequency into which DateArray must be converted.
Accepts any valid frequency specification (string or integer)
relation : {“END”, “START”} (optional)
Applies only when converting a lower frequency Date to a higher
frequency Date, or when converting a weekend Date to a business
frequency Date. Valid values are ‘START’ and ‘END’ (or just ‘S’ and
‘E’ for brevity if you wish).
For example, if converting a monthly date to a daily date, specifying
‘START’ (‘END’) would result in the first (last) day in the month.
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