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Share more code, that snippet does not show the problem. Note that `format.format` returns a string, `format.parse` returns a Date object. <https://docs.oracle.com/en/cloud/saas/netsuite/ns-online-help/section_4388721627.html>

```let date = moment(date).subtract(1, 'days');

date = format.parse({
    value: subCurrStartDate,
    type: format.Type.DATETIMETZ
});

log.debug(typeof subCurrStartDate, subCurrStartDate);
// "2022-08-03T07:00:00.000Z"
record.submitFields({
    type: 'field',
    id: id,
    values: {'field1': date}
});```


No, I was about to ask if the variables are in the right places. The first `date` line is redundant?

this code also use .parse but not .format.  so I'm a little confused too to be honest

not enough information given, setting a date field by value requires using a Date object

using a iso-8601 string like " "2022-08-03T07:00:00.000Z"" will always fail, no netsuite date time format matches that