igetdate.f

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C> @file
C> @brief Read the date-time from Section 1 of a BUFR message.

C> This function returns the date-time from within Section 1 of a
C> BUFR message.
C>
C> <p>The function will work on any BUFR message encoded using BUFR
C> edition 2, 3, or 4.
C>
C> @author J. Ator
C> @date 2005-11-29
C>
C> @param[in]  MBAY    - integer(*): BUFR message
C> @param[out] IYR    - integer: Year stored within Section 1 of MBAY,
C>                      in format of either YY or YYYY, depending on
C>                      the most recent call to subroutine datelen()
C> @param[out] IMO    - integer: Month stored within Section 1 of MBAY
C> @param[out] IDY    - integer: Day stored within Section 1 of MBAY
C> @param[out] IHR    - integer: Hour stored within Section 1 of MBAY
C> @returns igetdate    - integer: Date-time stored within Section 1
C>                        of MBAY, in format of either YYMMDDHH or
C>                        YYYYMMDDHH, depending on the most
C>                        recent call to subroutine datelen()
C>
C> @remarks
C> - The start of the BUFR message (i.e. the string 'BUFR') must be
C>   aligned on the first 4 bytes of MBAY.
C>
    FUNCTION igetdate(MBAY,IYR,IMO,IDY,IHR)

    COMMON /dateln/ lendat

    dimension mbay(*)

C-----------------------------------------------------------------------
C-----------------------------------------------------------------------

    iyr = iupbs01(mbay,'YEAR')
    imo = iupbs01(mbay,'MNTH')
    idy = iupbs01(mbay,'DAYS')
    ihr = iupbs01(mbay,'HOUR')
    IF(lendat.NE.10) THEN
        iyr = mod(iyr,100)
    ENDIF
    igetdate = (iyr*1000000) + (imo*10000) + (idy*100) + ihr

    RETURN
    END