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You can use the awk Velour library to return difference in seconds:

$ velour -n 'print t_utc("2010-9-9") - t_utc("2000-10-10")'
312854400

Or days:

$ velour -n 'print t_secday(t_utc("2010-9-9") - t_utc("2000-10-10"))'
3621

You can use the awk Velour library to return difference in seconds:

$ velour -n 'print t_utc(2010, 9, 9) - t_utc(2000, 10, 10)'
312854400

Or days:

$ velour -n 'print t_secday(t_utc(2010, 9, 9) - t_utc(2000, 10, 10))'
3621

You can use the awk Velour library to return difference in seconds:

$ velour -n 'print tm_date("2010-9-9") - tm_date("2000-10-10")'
312854400

Or days:

$ velour -n 'print (tm_date("2010-9-9") - tm_date("2000-10-10")) / tm_day(1)'
3621

You can use the awk Velour library to return difference in seconds:

$ velour -n 'print t_utc("2010-9-9") - t_utc("2000-10-10")'
312854400

Or days:

$ velour -n 'print t_secday(t_utc("2010-9-9") - t_utc("2000-10-10"))'
3621

You can use the awk Velour library to return difference in seconds:

$ velour 'BEGIN {print tm_date("2010-9-9") - tm_date("2000-10-10")}'
312854400

Or days:

$ velour 'BEGIN {print (tm_date("2010-9-9") - tm_date("2000-10-10")) / tm_day(1)}'
3621

You can use the awk Velour library to return difference in seconds:

$ velour -n 'print tm_date("2010-9-9") - tm_date("2000-10-10")'
312854400

Or days:

$ velour -n 'print (tm_date("2010-9-9") - tm_date("2000-10-10")) / tm_day(1)'
3621