TIMEVALUE Function - Google Sheets
The TIMEVALUE function converts a time to a fraction of 1. Google Sheets works with times as fractions of a number, not as text strings. This function converts times into their usable form. Noon would be .5 and 6 PM would be .75.
The function can be used with 12 hour AM/PM time or with 24 hour time. If a date and time is given to the function, the date will be ignored, but the time will be converted. To represent seconds, use a second colon. 5 minutes and 12 seconds would be "00:05:12" not "05:12".
Remember that dates are really just saved as numbers by your spreadsheet with date formatting applied. The date must be in a valid format, so you have to use the DATE function, wrap it in quotes, or use a cell reference to a cell containing a date.
time_text Text representation of a time.
DATEVALUE - Converts a date to a numeric value in a similar way as TIMEVALUE.
HOUR - Returns the hour value from a time
MINUTE - Returns the minute value from a time
SECOND - Returns the second value from a time
#VALUE! - The inputs are something that isn't a valid time such as "A minute ago" or "Then".
#NUM - An input is a number but is not a valid time.
Live examples in Sheets
Go to this spreadsheet for the examples of the TIMEVALUE function shown above that you can study and use anywhere you would like.