Floating Point Number of Seconds since Unix Epoch

$EPOCREALTIME contains the number of seconds since the Unix Epoch. It’s a floating-point value with micro-seconds granularity.

The Unix Epoch starts at 1970-01-01 00:00:00 +0000 (UTC).

Links

• Bash manual
• Epoc definition of POSIX
• Notes on Epoch in “man 2 time”
• Wikipedia on Unix Time

Examples

Print number of seconds since UNIX Epoch :

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2

LC_ALL=en_US
echo $EPOCHREALTIME

Output: 1611565468.766394.