Calculadora de Zonas Horarias
Interactive Tool

Excel Formula Generator

Excel time zone conversion formula Google Sheets timezone

Excel Formula Generator

Generate ready-to-paste Excel and Google Sheets formulas to convert time zones across your spreadsheets.

About This Tool

About the Excel Time Zone Calculator

Converting time zones in Excel and Google Sheets is notoriously tricky because spreadsheet software stores dates and times as decimal numbers (fractions of a 24-hour day), not as actual timezone-aware objects.

How Excel Handles Time
To convert a time from EST to PST (a 3-hour difference backwards), you don't subtract 3. You must subtract 3/24. Our generator automatically calculates the exact decimal fraction needed for your specific zone combination.
  • 1 Day = 1.0: In Excel, the integer part of a number represents the number of days since Jan 1, 1900.
  • 1 Hour = 1/24 (approx 0.04167).
  • 1 Minute = 1/1440.
FAQ

Frequently Asked Questions

Why use MOD for time-only conversions?
If you add 4 hours to 11 PM in Excel, the underlying number rolls over past 1.0 (into the next day). If your cell is formatted strictly as "Time", it might display correctly, but the underlying data is now a day ahead. Using MOD(formula, 1) strips away the days, keeping the data strictly as a time value.
Can Excel automatically handle Daylight Saving Time?
No. Excel has no built-in awareness of IANA timezones (like "America/New_York"). It only knows raw numbers. To handle dynamic DST in Excel, you must either use PowerQuery to call a timezone API, or write a very complex nested IF formula that hardcodes the DST transition dates for the specific year.