# [ferret_users] Time axis question

Hi Ferreters,

I have a simple question about the t pseudo-variable. I wasn't able to find exact answer in the documentation and I have trouble understanding what it refers to [please see exaple file below]
I would be thankful if someone could offer some clarification...

Sincerely,
Roman

define axis/t=01-jan-1610:01-feb-1610:6/unit=day timaxis
yes? list t[gt=timaxis]
VARIABLE : T
axis TIMAXIS
SUBSET   : 7 points (TIME)
01-JAN-1610 00 / 1:  3653.
07-JAN-1610 00 / 2:  3659.
13-JAN-1610 00 / 3:  3665.
19-JAN-1610 00 / 4:  3671.
25-JAN-1610 00 / 5:  3677.
31-JAN-1610 00 / 6:  3683.
06-FEB-1610 00 / 7:  3689.

yes? define axis/t=01-jan-1600:01-feb-1600:6/unit=day timaxis
Replacing definition of axis TIMAXIS

yes? list t[gt=timaxis]
VARIABLE : T
&nb! sp;       axis TIMAXIS
SUBSET   : 7 points (TIME)
01-JAN-1600 00 / 1:   0.00
07-JAN-1600 00 / 2:   6.00
13-JAN-1600 00 / 3:  12.00
19-JAN-1600 00 / 4:  18.00
25-JAN-1600 00 / 5:  24.00
31-JAN-1600 00 / 6:  30.00
06-FEB-1600 00 / 7:  36.00

yes? define axis/t=01-jan-1900:01-feb-1900:6/unit=day timaxis
Replacing definition of axis TIMAXIS

yes? list t[gt=timaxis]
VARIABLE : T
axis TIMAXIS
SUBSET   : 7 points (TIME)
01-JAN-1900 00 / 1:!    0.00
07-JAN-1900 00 / 2:   6.0! 0
&nb sp;13-JAN-1900 00 / 3:  12.00
19-JAN-1900 00 / 4:  18.00
25-JAN-1900 00 / 5:  24.00
31-JAN-1900 00 / 6:  30.00
06-FEB-1900 00 / 7:  36.00

yes? define axis/t=01-jan-1910:01-feb-1910:6/unit=day timaxis
Replacing definition of axis TIMAXIS

yes? list t[gt=timaxis]
VARIABLE : T
axis TIMAXIS
SUBSET   : 7 points (TIME)
01-JAN-1910 00 / 1:  3273.
07-JAN-1910 00 / 2:  3279.
13-JAN-1910 00 / 3:  3285.
19-JAN-1910 00 / 4:  3291.
25-JAN-1910 00 / 5:  3297.
31-JAN-1910 00 / 6:  3303.
06-FEB-1910 00 / 7:  3309.