differnce in temperatures - ignore nulls

[joeybird]

Hiya

I need to work out time difference between one date time stamp and another.

temperature of a room is taken on regular intervals during the day. This date time is recorded in the column, DateTimeTaken

=interval(max({<Temperature={'>=35'}>} DateTimeTaken) - min({<Temperature={'<=35'}>}DateTimeTaken) ,'h:mm' )

I need to calculate the time take for the room to reach 35.

sometimes the Temperature column is not filled in ''null'

please help

[swuehl · Accepted solution]

I guess it should be

=interval(Min({<Temperature={'>=35'}>} DateTimeTaken) - Max({<Temperature={'<=35'}>}DateTimeTaken) ,'h:mm' )

[#3]

U can just use the max DateTimeTaken before it reached 35

=interval(max({<Temperature={'<=35'}>}DateTimeTaken),'h:mm' )

[swuehl]

Could you maybe post some sample lines of data and your requested result?

[joeybird]

Hi

worked brill thank you x