This is what I did:

for (i=0; i<data.getNumberOfRows(); i++) {
    var date = data.getValue(i, 0);
    var year = (1900 + date.getYear());
    var quarter = Math.floor(date.getMonth()/3) + 1;
    var value = year + '-Q' + quarter;
    data.setFormattedValue(i, 0, value)
}

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