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The "DayOfWeek" service returns the day of the week of an OI date, which is assumed to be in OI's internal format. The day of the week is returned as an integer between 1 and 7, with 1 being Monday and 7 being Sunday. For example, if an OI date represents March 30, 1978, this service would return 4, since that date falls on a Thursday. If the given date is not valid, "" is returned.
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