HoursSince is a collection of functions and subroutines that calculate the number of hours of a given calendar date from Jan. 1 of a reference year. These functions were written as a component of the USGS volcanic ash transport and dispersion model, Ash3d. However, since they are useful for other programs outside of Ash3d, they are collected into a stand-along file that can either be compiled as a library or simply compiled directly with other source code.
To compile as a library, simple type:
make
Some subroutines in HoursSince.f90 have stand-alone wrapper programs, using 1900
as the base year for the hours calculation.
HoursSince1900
yyyymmddhh_since_1900
To compile these wrapper programs, type:
make tools
To test the library, type:
make check
This will run two tests. The first, the self-test program testHours which
verifies internal consistency of the subroutines. Second, the program
HoursSince1900 is used to calculate hour differences between random date
pairs, with a comparison to the calculation using the unix date command.
To install the library, edit the INSTALLDIR variable of the makefile (the
default is /opt/USGS) and type:
make install
You will need to have write permission in ${INSTALLDIR} or install as root.
Hans F. Schwaiger hschwaiger@usgs.gov
Larry G. Mastin lgmastin@usgs.gov
Roger P. Denlinger rdenlinger@usgs.gov