subroutine geth_idts (ndate, odate, idts) implicit none !*********************************************************************** ! ! purpose - from 2 input mdates ('YYYY-MM-DD HH:MM:SS'), compute ! the time difference in seconds. ! ! on entry - ndate - the new hdate. ! odate - the old hdate. ! ! on exit - idts - the change in time in seconds. ! !*********************************************************************** character*(*) ndate, odate character*19 tdate integer idts integer olen, nlen ! ! Local Variables ! ! yrnew - indicates the year associated with "ndate" ! yrold - indicates the year associated with "odate" ! monew - indicates the month associated with "ndate" ! moold - indicates the month associated with "odate" ! dynew - indicates the day associated with "ndate" ! dyold - indicates the day associated with "odate" ! hrnew - indicates the hour associated with "ndate" ! hrold - indicates the hour associated with "odate" ! minew - indicates the minute associated with "ndate" ! miold - indicates the minute associated with "odate" ! scnew - indicates the second associated with "ndate" ! scold - indicates the second associated with "odate" ! i - loop counter ! mday - a list assigning the number of days in each month ! newhrs - the number of hours between "ndate" and 1901 ! whole 24 hour days ! oldhrs - the number of hours between "odate" and 1901 ! integer yrnew, monew, dynew, hrnew, minew, scnew integer yrold, moold, dyold, hrold, miold, scold integer mday(12), i, newdys, olddys logical npass, opass integer isign ! External function: integer, external :: nfeb !************************* Subroutine Begin ************************** if (odate.gt.ndate) then isign = -1 tdate=ndate ndate=odate odate=tdate else isign = 1 endif ! ! Assign the number of days in a months ! mday( 1) = 31 mday( 2) = 28 mday( 3) = 31 mday( 4) = 30 mday( 5) = 31 mday( 6) = 30 mday( 7) = 31 mday( 8) = 31 mday( 9) = 30 mday(10) = 31 mday(11) = 30 mday(12) = 31 ! ! Break down old hdate into parts ! hrold = 0 miold = 0 scold = 0 olen = len(odate) read(odate(1:4), '(I4)') yrold read(odate(6:7), '(I2)') moold read(odate(9:10), '(I2)') dyold if (olen.ge.13) then read(odate(12:13),'(I2)') hrold if (olen.ge.16) then read(odate(15:16),'(I2)') miold if (olen.ge.19) then read(odate(18:19),'(I2)') scold endif endif endif ! ! Break down new hdate into parts ! hrnew = 0 minew = 0 scnew = 0 nlen = len(ndate) read(ndate(1:4), '(I4)') yrnew read(ndate(6:7), '(I2)') monew read(ndate(9:10), '(I2)') dynew if (nlen.ge.13) then read(ndate(12:13),'(I2)') hrnew if (nlen.ge.16) then read(ndate(15:16),'(I2)') minew if (nlen.ge.19) then read(ndate(18:19),'(I2)') scnew endif endif endif ! ! Check that the dates make sense. ! npass = .true. opass = .true. ! Check that the month of NDATE makes sense. if ((monew.gt.12).or.(monew.lt.1)) then print*, 'GETH_IDTS: Month of NDATE = ', monew npass = .false. endif ! Check that the month of ODATE makes sense. if ((moold.gt.12).or.(moold.lt.1)) then print*, 'GETH_IDTS: Month of ODATE = ', moold opass = .false. endif ! Check that the day of NDATE makes sense. if (monew.ne.2) then ! ...... For all months but February if ((dynew.gt.mday(monew)).or.(dynew.lt.1)) then print*, 'GETH_IDTS: Day of NDATE = ', dynew npass = .false. endif elseif (monew.eq.2) then ! ...... For February if ((dynew .gt. nfeb(yrnew)).or.(dynew.lt.1)) then print*, 'GETH_IDTS: Day of NDATE = ', dynew npass = .false. endif endif ! Check that the day of ODATE makes sense. if (moold.ne.2) then ! ...... For all months but February if ((dyold.gt.mday(moold)).or.(dyold.lt.1)) then print*, 'GETH_IDTS: Day of ODATE = ', dyold opass = .false. endif elseif (moold.eq.2) then ! ....... For February if ((dyold .gt. nfeb(yrold)).or.(dyold .lt. 1)) then print*, 'GETH_IDTS: Day of ODATE = ', dyold opass = .false. endif endif ! Check that the hour of NDATE makes sense. if ((hrnew.gt.23).or.(hrnew.lt.0)) then print*, 'GETH_IDTS: Hour of NDATE = ', hrnew npass = .false. endif ! Check that the hour of ODATE makes sense. if ((hrold.gt.23).or.(hrold.lt.0)) then print*, 'GETH_IDTS: Hour of ODATE = ', hrold opass = .false. endif ! Check that the minute of NDATE makes sense. if ((minew.gt.59).or.(minew.lt.0)) then print*, 'GETH_IDTS: Minute of NDATE = ', minew npass = .false. endif ! Check that the minute of ODATE makes sense. if ((miold.gt.59).or.(miold.lt.0)) then print*, 'GETH_IDTS: Minute of ODATE = ', miold opass = .false. endif ! ! Check that the second of NDATE makes sense. ! if ((scnew.gt.59).or.(scnew.lt.0)) then print*, 'GETH_IDTS: SECOND of NDATE = ', scnew npass = .false. endif ! Check that the second of ODATE makes sense. if ((scold.gt.59).or.(scold.lt.0)) then print*, 'GETH_IDTS: Second of ODATE = ', scold opass = .false. endif if (.not. npass) then print*, 'Screwy NDATE: ', ndate(1:nlen) STOP 'Error_ndate' endif if (.not. opass) then print*, 'Screwy ODATE: ', odate(1:olen) STOP 'Error_odate' endif ! ! Date Checks are completed. Continue. ! ! ! Compute number of days from 1 January ODATE, 00:00:00 until ndate ! Compute number of hours from 1 January ODATE, 00:00:00 until ndate ! Compute number of minutes from 1 January ODATE, 00:00:00 until ndate ! newdys = 0 do i = yrold, yrnew - 1 newdys = newdys + (365 + (nfeb(i)-28)) enddo if (monew .gt. 1) then mday(2) = nfeb(yrnew) do i = 1, monew - 1 newdys = newdys + mday(i) enddo mday(2) = 28 end if newdys = newdys + dynew-1 ! ! Compute number of hours from 1 January ODATE, 00:00:00 until odate ! Compute number of minutes from 1 January ODATE, 00:00:00 until odate ! olddys = 0 if (moold .gt. 1) then mday(2) = nfeb(yrold) do i = 1, moold - 1 olddys = olddys + mday(i) enddo mday(2) = 28 end if olddys = olddys + dyold-1 ! ! Determine the time difference in seconds ! idts = (newdys - olddys) * 86400 idts = idts + (hrnew - hrold) * 3600 idts = idts + (minew - miold) * 60 idts = idts + (scnew - scold) if (isign .eq. -1) then tdate=ndate ndate=odate odate=tdate idts = idts * isign endif !************************** Subroutine End *************************** end integer function nfeb(year) ! ! Compute the number of days in February for the given year. ! implicit none integer, intent(in) :: year ! Four-digit year nfeb = 28 ! By default, February has 28 days ... if (mod(year,4).eq.0) then nfeb = 29 ! But every four years, it has 29 days ... if (mod(year,100).eq.0) then nfeb = 28 ! Except every 100 years, when it has 28 days ... if (mod(year,400).eq.0) then nfeb = 29 ! Except every 400 years, when it has 29 days ... if (mod(year,3600).eq.0) then nfeb = 28 ! Except every 3600 years, when it has 28 days. endif endif endif endif end function nfeb