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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