Campbell-scientific LoggerNet Datalogger Support Software Manual de usuario descargar pdf (Pagina 365)

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Section 8. Working with Data Files on the PC

edate(“mm/dd/yy, hh:nn”;1;1;1;1) 02/25/02, 04:10

edate(“yyyy”, “dayofyear”, “hhnn”;1;1;1;1) 2002, 56, 0410

Notice that this last example essentially creates an array-type of timestamp.

When processing a data file from a mixed array datalogger, if the

time stamp uses midnight as 2400 with “today’s” date, the date

function will convert that time stamp to 0000 hours with

“tomorrow’s” date. The “No Date Advance” function can be used

to stop the date from rolling forward (Other button, No Date

Advance check box).

edate(“format”; S; H; D; Y) edate( ) functions identically to date( )

above, except that the time stamp is not surrounded by

quotes.

Monthly Summary Example

The Date function can be used to produce a monthly summary of daily time

series data by using Date( ) for the interval in the time series function. This

will trigger time series output for the first day of each month. The syntax is

avg(7;date(3;2)), where you want to take a monthly average of element 7, and

the day of year is contained in element 3 and the year in element 2. If you have

data recorded on a once per minute or once per hour basis, it must first be

processed into a 24 hour summary for this function to produce the output

expected.

When Date and Edate are used within other functions they must

be used with the older format Date(doy;y) and Edate(doy;y)

instead of using the extended date functions. For example

AVG(1;Date(3;2)). When used with table based data files the

format would be AVG(1;Date(1;1)).

When producing a monthly summary and outputting the month along with the

data, you might want to set up the value for the month as “month –1”, to

correctly reflect the month that the data actually represents.

NOTE

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