By default, all start and end times are recorded as Unix timestamps. This is a universal standard that accommodates all time zones. If you'd like to translate Unix timestamps into a more readable format, here's how:
Open your report in Excel
Create a new column for your readable date, put in this formula: =(((A1/60)/60-5)/24)+DATE(1970,1,1) where A1 is the column with the Unix timestamp, and -4 is the offset for GMT. For example, EST is -5 hours off from GMT, so this formula would provide the date in EST timezone. For GMT timezone, the formula would be
For PST, the formula would be
Once you hit enter, you will notice a numeric value. Make sure you format that cell as a “Date” and you may pick which date format you prefer.