How to convert Unix timestamp to Datetime in Tcl

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    set unix_timestamp 1472832928
    
    # Convert Unix timestamp to Date
    set formatted_date [clock format $unix_timestamp -format "%Y-%m-%d %H:%M:%S" -gmt true]
    
    # Output the formatted date
    puts "Converted Date: $formatted_date"

Output:

Converted Date: 2016-09-02 16:15:28

Example only. There may be multiple ways to perform this operation.

Code Explanation

When using TCL to convert Unix timestamp clock format $unix_timestamp takes the Unix timestamp 1472832928 and converts it into a human-readable format. -format "%Y-%m-%d %H:%M:%S" specifies the format for the date (year-month-day hour:minute) and -gmt true ensures the output is in GMT (UTC) time.

Convert Date to Unix timestamp in TCL

Other useful Tcl date functions

Command	Description	Example
`clock format`	Formats a Unix timestamp into a human-readable date.	`clock format 1514764800 -format "%Y-%m-%d %H:%M:%S"` returns 2018-01-01 00:00:00
`clock scan`	Parses a date string and returns the Unix timestamp.	`clock scan "2018-07-15 12:30:45" -format "%Y-%m-%d %H:%M:%S"` returns 1531656645
`clock seconds`	Returns the current Unix timestamp.	`clock seconds` returns the current Unix timestamp.
`-gmt`	Used with `clock format` or `clock scan` to specify UTC (GMT) time.	`clock format 1514764800 -gmt true` formats the date in UTC.
`-format`	Specifies the format for parsing or displaying the date.	`clock format 1514764800 -format "%Y-%m-%d %H:%M:%S"` formats as 2018-01-01 00:00:00.

Current Unix Timestamp SECONDS SINCE JAN 01 1970

Current UTC Time

2025-08-20