In this case, you may need to adjust the numerical value in the field.
Occasionally, a Time Zone Not Sure field appears. Some time zones in the database are either unknown or are subject to special issues or exceptions outlined in this Historical Time Zone Issues article. If after selecting your location and clicking Submit the software refreshes the same screen, you will see a new field under the time field titled "Time Zone Not Sure." In this case, you may need to adjust the numerical value in the field. If the value is correct, simply click Submit again to get to your report.