Mastering Blockchain Programming with Solidity

Supported units for time

Suffixes such as seconds, minutes, hours, days, weeks, and years used after number literals, and these can be used to convert between units of time, where seconds are the base unit of each and units are converted naively in the following way:

• 1 == 1 second
• 1 minute == 60 seconds
• 1 hour == 60 minutes
• 1 day == 24 hours
• 1 week == 7 days
• 1 year == 365 days

You should not rely on the aforementioned suffixes if you need some calendar-specific calculations, such as taking into account leap years. These units do not take care of leap years or leap seconds. Because of this reason, the years suffix has been deprecated.