Question: how to subtract minutes and seconds in excel?
Answer: Add over 24 hours: Start time + (N/24)
Add over 60 minutes: Start time + (N/1440)
Add over 60 seconds: Start time + (N/86400)
Subtract over 24 hours: Start time - (N/24)
Subtract over 60 minutes: Start time - (N/1440)
Subtract over 60 seconds: