Thread: Re: Thank you: Question about the date format in SAC Pole Zero files: 1996.033.24.60.60.99999

Dr. PLASENCIA LINARES,



Again, thank you for your reply. I will use the start time, sample rate and
number of samples from the SAC file to determine the applicable Pole-Zero
duration. This end date numbering only becomes a problem if a later
Pole-Zero file shows a start date before the end of the Pole-Zero file with
Hours=24.



I am slowly verifying details,

Mike Padgett



From: Milton Plasencia [mpplasencia<at>gmail.com]
Sent: Tuesday, April 22, 2014 2:35 AM
To: Mike Padgett
Cc: sac-help<at>iris.washington.edu
Subject: Re: [SAC-HELP] Question about the date format in SAC Pole Zero
files: 1996.033.24.60.60.99999



Hi,



Is an error in the SEED (Response and P&Z) file, because the user

enter the START and END date and time of experiment.

-----------------------

The format is:

YYYY-MM-DDThh:mm:ssTZD

where:

YYYY = four-digit year
MM = two-digit month (01=January, etc.)
DD = two-digit day of month (01 through 31)
hh = two digits of hour (00 through 23) (am/pm NOT allowed)
mm = two digits of minute (00 through 59)
ss = two digits of second (00 through 59)
TZD = time zone designator
----------------



You can see the ISO-8601 for representation of dates and times.

There, you can find the "T" separator between date and time,

"T" indicates the beginning of the time part.



HTH,



Milton



* * * * * * * * * * * * * * * * * * * * * * *

Milton P. PLASENCIA LINARES



Centro di Ricerche Sismologiche (CRS)

OGS - Istituto Nazionale di Oceanografia e di Geofisica Sperimentale



Borgo Grotta Gigante 42/C

(34010) Sgonico - Trieste - Italia

Tel: +39 040 2140 141 (Udine)

Tel: +39 040 2140 256 (Trieste)

Cel.: +39 331 6481 935



E-mail: mplasencia<at>inogs.it <mplasencia<at>inogs.it>



ASAIN (Antarctic Seismographic Argentinean Italian Network)

*********************************



















On Apr 18, 2014, at 10:21 PM, Mike Padgett <mpadgett<at>quantum-earth.com
<mpadgett<at>quantum-earth.com> > wrote:





In decoding the date format in SAC Pole Zero files produced by rdseed, a
time of Hour = 24, Minute=60, Seconds = 60.99999 is encountered.



Should an hour of 24 add 1 day to the date?

Should 60 minutes add 1 hour to the number of hours?



For instance, in the case of "1996.033.24.60.60.99999", should it be
decoded to:



Year = 1996

Month = 2

Day = 3

Hour =1

Minutes = 1

Seconds = .99999



Alternatively, how is "1996-02-02T24:60:60" as shown in the file below, to
be decoded?

Is there something special about the "T" in the date format?



The file name is:



SAC_PZs_CI_PAS_VHZ__1996.029.00.00.00.0000_1996.033.24.60.60.99999





* **********************************

* NETWORK (KNETWK): CI

* STATION (KSTNM): PAS

* LOCATION (KHOLE):

* CHANNEL (KCMPNM): VHZ

* CREATED : 2014-03-31T16:34:17

* START : 1996-01-29T00:00:00

* END : 1996-02-02T24:60:60

* DESCRIPTION : Pasadena, California, USA

* LATITUDE : 34.148440

* LONGITUDE : -118.171170

* ELEVATION : 314.0

* DEPTH : 0.0

* DIP : 0.0

* AZIMUTH : 0.0

* SAMPLE RATE : 0.1

* INPUT UNIT : M

* OUTPUT UNIT : COUNTS

* INSTTYPE : Streckeisen STS-1V/VBB Seismometer

* INSTGAIN : 2.510500e+03 (M/S)

* COMMENT : N/A

* SENSITIVITY : 1.684800e+10 (M/S)

* A0 : 3.948580e+03

* **********************************

ZEROS 3

+0.000000e+00 +0.000000e+00

+0.000000e+00 +0.000000e+00

+0.000000e+00 +0.000000e+00

POLES 4

-1.234000e-02 +1.234000e-02

-1.234000e-02 -1.234000e-02

-3.918000e+01 +4.912000e+01

-3.918000e+01 -4.912000e+01

CONSTANT +6.652568e+13



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