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source: palm/trunk/SOURCE/palm_date_time_mod.f90 @ 4719

Last change on this file since 4719 was 4680, checked in by gronemeier, 4 years ago
Add option to fix date and time of the simulation; renamed set_reference_date_time to init_date_time (palm_date_time_mod, init_3d_model, modules, parin)
Property svn:keywords set to `Id`
File size: 29.9 KB

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[4227]	1	!> @file palm_date_time_mod.f90
[4680]	2	!--------------------------------------------------------------------------------------------------!
[4227]	3	! This file is part of the PALM model system.
	4	!
[4680]	5	! PALM is free software: you can redistribute it and/or modify it under the terms of the GNU General
	6	! Public License as published by the Free Software Foundation, either version 3 of the License, or
	7	! (at your option) any later version.
[4227]	8	!
[4680]	9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
	10	! implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
	11	! Public License for more details.
[4227]	12	!
[4680]	13	! You should have received a copy of the GNU General Public License along with PALM. If not, see
	14	! <http://www.gnu.org/licenses/>.
[4227]	15	!
[4360]	16	! Copyright 1997-2020 Leibniz Universitaet Hannover
[4680]	17	!--------------------------------------------------------------------------------------------------!
[4227]	18	!
	19	! Current revisions:
	20	! ------------------
[4680]	21	!
	22	!
[4227]	23	! Former revisions:
	24	! -----------------
	25	! $Id: palm_date_time_mod.f90 4680 2020-09-16 10:20:34Z pavelkrc $
[4680]	26	! Add option to fix date and time; renamed set_reference_date_time to init_date_time
	27	!
	28	! 4360 2020-01-07 11:25:50Z suehring
[4267]	29	! Add days of northward- and southward equinox
[4680]	30	!
[4267]	31	! 4227 2019-09-10 18:04:34Z gronemeier
[4227]	32	! Complete rework of module date_and_time_mod:
	33	! - renamed module to prevent confusion with
	34	! FORTRAN Standard routine date_and_time
	35	! - introduce date_time_type
	36	! - add set_reference_date_time
	37	! - add get_date_time
	38	! - capsule whole calculation of date and time variables within this routine
	39	! - removed all variables/routines not belonging to this module
	40	!
	41	!
	42	! Authors:
	43	! --------
	44	!> @author Tobias Gronemeier (LUH)
	45	!
	46	! Description:
	47	! ------------
	48	!> This routine calculates all needed information on date and time used by
	49	!> other modules
	50	!>
	51	!> @todo Consider leap seconds
[4680]	52	!> @note Time_zone only supports full-hour time zones, i.e., time zones like Australian Central
	53	!> Standard Time (UTC+9.5) are not possible
	54	!--------------------------------------------------------------------------------------------------!
[4227]	55	MODULE palm_date_time_mod
	56
[4680]	57	USE control_parameters, &
[4227]	58	ONLY: message_string
	59
	60	USE kinds
	61
	62	IMPLICIT NONE
	63
	64	!
	65	!-- Parameter Definition
	66	INTEGER(iwp), PARAMETER :: date_time_str_len = 23_iwp !< length of date_time strings
	67	INTEGER(iwp), PARAMETER :: days_per_week = 7_iwp !< days in a week
	68	INTEGER(iwp), PARAMETER :: hours_per_day = 24_iwp !< hours in a day
	69	INTEGER(iwp), PARAMETER :: minutes_per_hour = 60_iwp !< minutes in an hour
	70	INTEGER(iwp), PARAMETER :: months_per_year = 12_iwp !< months in a year
[4267]	71	!
[4680]	72	!-- Day of year of the mean northward and southward equinox (summer and winter half year)
	73	INTEGER(iwp), PARAMETER :: northward_equinox = 80_iwp !< Mar 21 (leap year: Mar 20)
	74	INTEGER(iwp), PARAMETER :: southward_equinox = 264_iwp !< Sep 21 (leap year: Sep 20)
[4227]	75
	76	REAL(wp), PARAMETER :: seconds_per_minute = 60.0_wp !< seconds in a minute
	77	REAL(wp), PARAMETER :: seconds_per_hour = seconds_per_minute * minutes_per_hour !< seconds in an hour
	78	REAL(wp), PARAMETER :: seconds_per_day = seconds_per_hour * hours_per_day !< seconds in a day
	79
	80	CHARACTER(LEN=3), DIMENSION(days_per_week), PARAMETER :: &
	81	weekdays = (/"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"/) !< names of weekdays
	82
	83	INTEGER, DIMENSION(months_per_year), PARAMETER :: &
	84	days_per_month_noleapyear = (/31,28,31,30,31,30,31,31,30,31,30,31/) !< days for each month (no leap year)
	85
	86	INTEGER, DIMENSION(months_per_year), PARAMETER :: &
	87	days_per_month_leapyear = (/31,29,31,30,31,30,31,31,30,31,30,31/) !< days for each month (leap year)
	88
	89	INTEGER, DIMENSION(121), PARAMETER :: leap_years = & !< list of leap years
	90	(/1804_iwp, 1808_iwp, 1812_iwp, 1816_iwp, 1820_iwp, 1824_iwp, 1828_iwp, 1832_iwp, &
	91	1836_iwp, 1840_iwp, 1844_iwp, 1848_iwp, 1852_iwp, 1856_iwp, 1860_iwp, 1864_iwp, &
	92	1868_iwp, 1872_iwp, 1876_iwp, 1880_iwp, 1884_iwp, 1888_iwp, 1892_iwp, 1896_iwp, &
	93	1904_iwp, 1908_iwp, 1912_iwp, 1916_iwp, 1920_iwp, 1924_iwp, 1928_iwp, 1932_iwp, &
	94	1936_iwp, 1940_iwp, 1944_iwp, 1948_iwp, 1952_iwp, 1956_iwp, 1960_iwp, 1964_iwp, &
	95	1968_iwp, 1972_iwp, 1976_iwp, 1980_iwp, 1984_iwp, 1988_iwp, 1992_iwp, 1996_iwp, &
	96	2000_iwp, 2004_iwp, 2008_iwp, 2012_iwp, 2016_iwp, 2020_iwp, 2024_iwp, 2028_iwp, &
	97	2032_iwp, 2036_iwp, 2040_iwp, 2044_iwp, 2048_iwp, 2052_iwp, 2056_iwp, 2060_iwp, &
	98	2064_iwp, 2068_iwp, 2072_iwp, 2076_iwp, 2080_iwp, 2084_iwp, 2088_iwp, 2092_iwp, &
	99	2096_iwp, 2104_iwp, 2108_iwp, 2112_iwp, 2116_iwp, 2120_iwp, 2124_iwp, 2128_iwp, &
	100	2132_iwp, 2136_iwp, 2140_iwp, 2144_iwp, 2148_iwp, 2152_iwp, 2156_iwp, 2160_iwp, &
	101	2164_iwp, 2168_iwp, 2172_iwp, 2176_iwp, 2180_iwp, 2184_iwp, 2188_iwp, 2192_iwp, &
	102	2196_iwp, 2204_iwp, 2208_iwp, 2212_iwp, 2216_iwp, 2220_iwp, 2224_iwp, 2228_iwp, &
	103	2232_iwp, 2236_iwp, 2240_iwp, 2244_iwp, 2248_iwp, 2252_iwp, 2256_iwp, 2260_iwp, &
	104	2264_iwp, 2268_iwp, 2272_iwp, 2276_iwp, 2280_iwp, 2284_iwp, 2288_iwp, 2292_iwp, &
	105	2296_iwp /)
	106
	107	!
	108	!-- Type Definition
	109	TYPE date_time_type
	110	INTEGER(iwp) :: year = -HUGE(0_iwp) !< year
	111	INTEGER(iwp) :: month = -HUGE(0_iwp) !< month of year
	112	INTEGER(iwp) :: day = -HUGE(0_iwp) !< day of month
	113	INTEGER(iwp) :: hour = -HUGE(0_iwp) !< hour of day
	114	INTEGER(iwp) :: minute = -HUGE(0_iwp) !< minute of hour
	115	INTEGER(iwp) :: zone = -HUGE(0_iwp) !< time zone
	116
	117	REAL(wp) :: second = -HUGE(0.0_wp) !< second of minute
	118	REAL(wp) :: second_of_year = -HUGE(0.0_wp) !< second of year
	119
	120	INTEGER(iwp) :: days_per_year = -HUGE(0_iwp) !< days within a year
	121
	122	INTEGER, DIMENSION(months_per_year) :: days_per_month = days_per_month_noleapyear !< list of total days per month
	123	END TYPE date_time_type
	124
	125	!
	126	!-- Variable Declaration
[4680]	127	LOGICAL :: date_is_fixed = .FALSE. !< if true, date is fixed (time can still change)
[4227]	128	LOGICAL :: reference_date_time_is_set = .FALSE. !< true if reference_date_time is set
[4680]	129	LOGICAL :: time_is_fixed = .FALSE. !< if true, time does not change at all
[4227]	130
	131	TYPE(date_time_type) :: reference_date_time !< reference date-time
	132
	133	SAVE
	134
	135	PRIVATE
	136	!
	137	!-- Set reference date and time
[4680]	138	INTERFACE init_date_time
	139	MODULE PROCEDURE init_date_time
	140	END INTERFACE init_date_time
[4227]	141	!
	142	!-- Return date and time information
	143	INTERFACE get_date_time
	144	MODULE PROCEDURE get_date_time
	145	END INTERFACE get_date_time
	146	!
	147	!-- Public Interfaces
	148	PUBLIC &
	149	get_date_time, &
[4680]	150	init_date_time
[4227]	151	!
	152	!-- Public variables
	153	PUBLIC &
	154	date_time_str_len, &
	155	days_per_week, &
	156	hours_per_day, &
	157	minutes_per_hour, &
	158	months_per_year, &
[4267]	159	northward_equinox, &
[4227]	160	seconds_per_minute, &
	161	seconds_per_hour, &
	162	seconds_per_day, &
[4267]	163	southward_equinox, &
[4227]	164	weekdays
	165
	166	CONTAINS
	167
	168
	169	!--------------------------------------------------------------------------------------------------!
	170	! Description:
	171	! ------------
[4680]	172	!> Initialize date-time setting by defining a global reference date-time and choosing a variable or
	173	!> fixed date.
[4227]	174	!> Only a single call is allowed to this routine during execution.
	175	!--------------------------------------------------------------------------------------------------!
[4680]	176	SUBROUTINE init_date_time( date_time_str, use_fixed_date, use_fixed_time )
[4227]	177
	178	CHARACTER(LEN=date_time_str_len), INTENT(IN) :: date_time_str !< string containing date-time information
	179
[4680]	180	LOGICAL, INTENT(IN), OPTIONAL :: use_fixed_date !< flag to fix date
	181	LOGICAL, INTENT(IN), OPTIONAL :: use_fixed_time !< flag to fix time
[4227]	182	!
	183	!-- Check if date and time are already set
	184	IF ( reference_date_time_is_set ) THEN
	185	!> @note This error should never be observed by a user.
	186	!> It can only appear if the code was modified.
[4680]	187	WRITE( message_string, * ) 'Multiple calls to init_date_time detected.&' // &
	188	'This routine must not be called more than once.'
	189	CALL message( 'init_date_time', 'PA0680', 2, 2, 0, 6, 0 )
[4227]	190	RETURN
	191
	192	ELSE
	193
	194	reference_date_time = convert_string_to_date_time( date_time_str )
	195
	196	reference_date_time_is_set = .TRUE.
	197
[4680]	198	IF ( PRESENT( use_fixed_date ) ) date_is_fixed = use_fixed_date
	199	IF ( PRESENT( use_fixed_time ) ) time_is_fixed = use_fixed_time
	200
[4227]	201	ENDIF
	202
[4680]	203	END SUBROUTINE init_date_time
[4227]	204
	205
	206	!--------------------------------------------------------------------------------------------------!
	207	! Description:
	208	! ------------
	209	!> Return requested date-time information of the reference time + time_since_reference.
	210	!> An alternative reference date-time string can be specified via 'reference_date_time_str'.
	211	!> Call to this routine is only possible if a reference time is either specified in the call itself
[4680]	212	!> via 'reference_date_time_str' or previously set by calling routine 'init_date_time'.
[4227]	213	!--------------------------------------------------------------------------------------------------!
	214	SUBROUTINE get_date_time( time_since_reference, reference_date_time_str, &
	215	year, month, day, hour, minute, second, zone, &
	216	second_of_day, second_of_year, &
	217	day_of_year, day_of_week, weekday, date_time_str, &
	218	days_per_month, days_per_year )
	219
	220	CHARACTER(LEN=date_time_str_len), INTENT(OUT), OPTIONAL :: date_time_str !< date-time as string
	221	CHARACTER(LEN=1) :: plus_minus !< either '+' or '-'
	222	CHARACTER(LEN=date_time_str_len), INTENT(IN), OPTIONAL :: reference_date_time_str !< alternative reference date-time
	223	CHARACTER(LEN=3), INTENT(OUT), OPTIONAL :: weekday !< weekday
	224
	225	INTEGER(iwp), INTENT(OUT), OPTIONAL :: day !< day of month
	226	INTEGER(iwp), INTENT(OUT), OPTIONAL :: day_of_week !< number of weekday
	227	INTEGER(iwp), INTENT(OUT), OPTIONAL :: day_of_year !< day of the year
	228	INTEGER(iwp), INTENT(OUT), OPTIONAL :: hour !< hour of day
	229	INTEGER(iwp), INTENT(OUT), OPTIONAL :: minute !< minute of hour
	230	INTEGER(iwp), INTENT(OUT), OPTIONAL :: month !< month of year
	231	INTEGER(iwp), INTENT(OUT), OPTIONAL :: year !< year
	232	INTEGER(iwp), INTENT(OUT), OPTIONAL :: zone !< time zone
	233	INTEGER(iwp), INTENT(OUT), OPTIONAL :: days_per_year !< days per year
	234	INTEGER(iwp), DIMENSION(months_per_year), INTENT(OUT), OPTIONAL :: days_per_month !< days per year
	235
	236	REAL(wp), INTENT(OUT), OPTIONAL :: second !< second of minute
	237	REAL(wp), INTENT(OUT), OPTIONAL :: second_of_day !< second of day
	238	REAL(wp), INTENT(OUT), OPTIONAL :: second_of_year !< second of year
	239	REAL(wp), INTENT(IN) :: time_since_reference !< seconds between reference time and current time
	240
	241	TYPE(date_time_type) :: date_time !< date-time which to return
	242	TYPE(date_time_type) :: internal_reference_date_time !< internal reference date-time
	243
	244	!
	245	!-- Check if a reference date-time is given
	246	IF ( .NOT. reference_date_time_is_set .AND. .NOT. PRESENT( reference_date_time_str ) ) THEN
	247	!> @note This error should never be observed by a user.
	248	!> It can only appear if the code was modified.
	249	WRITE( message_string, * ) 'No reference date-time defined. '// &
	250	'Returning date-time information is not possible. ' // &
	251	'Either specify reference_date_time_str ' // &
[4680]	252	'or set a reference via init_date_time.'
[4227]	253	CALL message( 'get_date_time', 'PA0677', 2, 2, 0, 6, 0 )
	254	RETURN
	255	ENDIF
	256	!
	257	!-- Set internal reference date-time
	258	IF ( PRESENT( reference_date_time_str ) ) THEN
	259	internal_reference_date_time = convert_string_to_date_time( reference_date_time_str )
	260	ELSE
	261	internal_reference_date_time = reference_date_time
	262	ENDIF
[4680]	263
	264	IF ( time_is_fixed ) THEN
[4227]	265	!
[4680]	266	!-- If time shall not change, set new time to reference time
	267	date_time = internal_reference_date_time
	268	ELSE
[4227]	269	!
[4680]	270	!-- Add time to reference time
	271	date_time = add_date_time( time_since_reference, internal_reference_date_time )
	272	!
	273	!-- If date shall be fixed, revert it to the reference date if changed
	274	IF ( date_is_fixed ) THEN
	275	IF ( date_time%year /= internal_reference_date_time%year .OR. &
	276	get_day_of_year( date_time ) /= get_day_of_year( internal_reference_date_time ) ) &
	277	THEN
	278
	279	date_time%year = internal_reference_date_time%year
	280	date_time%month = internal_reference_date_time%month
	281	date_time%day = internal_reference_date_time%day
	282
	283	date_time = update_leapyear_setting( date_time )
	284
	285	date_time%second_of_year = get_second_of_year( date_time )
	286
	287	ENDIF
	288	ENDIF
	289	ENDIF
	290	!
[4227]	291	!-- Set requested return values
	292	IF ( PRESENT( year ) ) year = date_time%year
	293	IF ( PRESENT( month ) ) month = date_time%month
	294	IF ( PRESENT( day ) ) day = date_time%day
	295	IF ( PRESENT( hour ) ) hour = date_time%hour
	296	IF ( PRESENT( minute ) ) minute = date_time%minute
	297	IF ( PRESENT( second ) ) second = date_time%second
	298	IF ( PRESENT( zone ) ) zone = date_time%zone
	299	IF ( PRESENT( second_of_year ) ) second_of_year = date_time%second_of_year
	300	IF ( PRESENT( second_of_day ) ) second_of_day = get_second_of_day( date_time )
	301	IF ( PRESENT( day_of_year ) ) day_of_year = get_day_of_year( date_time )
	302	IF ( PRESENT( day_of_week ) ) day_of_week = get_day_of_week( date_time )
	303	IF ( PRESENT( weekday ) ) weekday = weekdays( get_day_of_week( date_time ) )
	304	IF ( PRESENT( days_per_month ) ) days_per_month = date_time%days_per_month
	305	IF ( PRESENT( days_per_year ) ) days_per_year = date_time%days_per_year
	306
	307	IF ( PRESENT( date_time_str ) ) THEN
	308	IF ( date_time%zone < 0_iwp ) THEN
	309	plus_minus = '-'
	310	ELSE
	311	plus_minus = '+'
	312	ENDIF
	313	WRITE( UNIT = date_time_str, &
	314	FMT = '(I4,"-",I2.2,"-",I2.2,1X,I2.2,":",I2.2,":",I2.2,1X,A1,I2.2)' ) &
	315	date_time%year, date_time%month, date_time%day, &
	316	date_time%hour, date_time%minute, INT( date_time%second ), &
	317	plus_minus, ABS( date_time%zone )
	318	ENDIF
	319
	320	END SUBROUTINE get_date_time
	321
	322
	323	!--------------------------------------------------------------------------------------------------!
	324	! Description:
	325	! ------------
	326	!> Convert a date-time string into a date_time object.
	327	!--------------------------------------------------------------------------------------------------!
	328	FUNCTION convert_string_to_date_time( date_time_str ) RESULT( date_time )
	329
	330	CHARACTER(LEN=date_time_str_len), INTENT(IN) :: date_time_str !< date-time as string
	331
	332	INTEGER(iwp) :: read_status !< returned status of read command
	333
	334	TYPE(date_time_type) :: date_time !< requested date-time object
	335
	336	!
	337	!-- Decompose string to date-time information
	338	READ( UNIT = date_time_str( 1: 4), IOSTAT = read_status, FMT = '(I4)' ) date_time%year
	339	IF ( read_status == 0 ) &
	340	READ( UNIT = date_time_str( 6: 7), IOSTAT = read_status, FMT = '(I2)' ) date_time%month
	341	IF ( read_status == 0 ) &
	342	READ( UNIT = date_time_str( 9:10), IOSTAT = read_status, FMT = '(I2)' ) date_time%day
	343	IF ( read_status == 0 ) &
	344	READ( UNIT = date_time_str(12:13), IOSTAT = read_status, FMT = '(I2)' ) date_time%hour
	345	IF ( read_status == 0 ) &
	346	READ( UNIT = date_time_str(15:16), IOSTAT = read_status, FMT = '(I2)' ) date_time%minute
	347	IF ( read_status == 0 ) &
	348	READ( UNIT = date_time_str(18:19), IOSTAT = read_status, FMT = '(F2.0)' ) date_time%second
	349	IF ( read_status == 0 ) &
	350	READ( UNIT = date_time_str(21:23), IOSTAT = read_status, FMT = '(I3)' ) date_time%zone
	351
	352	IF ( read_status /= 0 ) THEN
	353	WRITE( message_string, * ) 'Error while converting date-time string. ' // &
	354	'Please check format of date-time string: "' // &
	355	TRIM( date_time_str ) // '". ' // &
	356	'Format must be "YYYY-MM-DD hh:mm:ss ZZZ".'
	357	CALL message( 'convert_string_to_date_time', 'PA0678', 2, 2, 0, 6, 0 )
	358	RETURN
	359	ENDIF
	360
	361	date_time = update_leapyear_setting( date_time )
	362
	363	IF ( check_date( date_time, date_time_str ) == 0 ) THEN
	364
	365	date_time%second_of_year = get_second_of_year( date_time )
	366
	367	!
	368	!-- Shift time to UTC and set zone to UTC
	369	date_time = add_date_time( REAL( -1 * date_time%zone, KIND = wp ) &
	370	* seconds_per_hour, &
	371	date_time )
	372	date_time%zone = 0_iwp
	373	ENDIF
	374
	375	END FUNCTION convert_string_to_date_time
	376
	377
	378	!--------------------------------------------------------------------------------------------------!
	379	! Description:
	380	! ------------
	381	!> Add time increment (in seconds) to given date-time and return shifted date-time
	382	!--------------------------------------------------------------------------------------------------!
	383	FUNCTION add_date_time( inc_seconds, date_time_base ) RESULT( date_time )
	384
	385	INTEGER(iwp) :: i !< loop index
	386
	387	REAL(wp) :: seconds_left !< seconds which must still be added to new date-time
	388	REAL(wp) :: seconds_per_year !< number of seconds in a year
	389
	390	REAL(wp), INTENT(IN) :: inc_seconds !< seconds to be added to date-time
	391
	392	TYPE(date_time_type) :: date_time !< shifted date-time
	393	TYPE(date_time_type), INTENT(IN) :: date_time_base !< date-time to be shifted
	394
	395	!
	396	!-- Define some parameters
	397	date_time = date_time_base
	398	seconds_per_year = REAL( date_time%days_per_year, KIND = wp ) * seconds_per_day
	399	!
	400	!-- Shift time
	401	date_time%second_of_year = date_time%second_of_year + inc_seconds
	402	!
	403	!-- Check if year changes
	404	!-- First, if year is reduced
	405	DO WHILE ( date_time%second_of_year < 0.0_wp )
	406	date_time%year = date_time%year - 1_iwp
	407	date_time = update_leapyear_setting( date_time )
	408	seconds_per_year = REAL( date_time%days_per_year * seconds_per_day, KIND = wp )
	409	date_time%second_of_year = date_time%second_of_year + seconds_per_year
	410	ENDDO
	411	!
	412	!-- Now, if year is increased
	413	DO WHILE ( date_time%second_of_year > seconds_per_year )
	414	date_time%year = date_time%year + 1_iwp
	415	date_time = update_leapyear_setting( date_time )
	416	date_time%second_of_year = date_time%second_of_year - seconds_per_year
	417	seconds_per_year = REAL( date_time%days_per_year * seconds_per_day, KIND = wp )
	418	ENDDO
	419	!
	420	!-- Based on updated year and second_of_year, update month, day, hour, minute, second
	421	DO i = 1, months_per_year
	422	IF ( date_time%second_of_year < SUM( date_time%days_per_month(1:i) ) * seconds_per_day ) &
	423	THEN
	424	date_time%month = i
	425	seconds_left = date_time%second_of_year &
	426	- REAL( SUM( date_time%days_per_month(1:i-1) ), KIND=wp ) &
	427	* seconds_per_day
	428	date_time%day = INT( seconds_left / seconds_per_day, KIND = iwp ) + 1_iwp
	429	seconds_left = seconds_left &
	430	- REAL( date_time%day - 1_iwp, KIND = wp ) * seconds_per_day
	431	date_time%hour = INT( seconds_left / seconds_per_hour, KIND = iwp )
	432	seconds_left = seconds_left - REAL( date_time%hour, KIND = wp ) * seconds_per_hour
	433	date_time%minute = INT( seconds_left / seconds_per_minute, KIND = iwp )
	434	date_time%second = seconds_left - REAL( date_time%minute, KIND = wp ) * seconds_per_minute
	435	EXIT
	436	ENDIF
	437	ENDDO
	438
	439	END FUNCTION add_date_time
	440
	441
	442	!--------------------------------------------------------------------------------------------------!
	443	! Description:
	444	! ------------
	445	!> Return day of year of given date.
	446	!--------------------------------------------------------------------------------------------------!
	447	FUNCTION get_day_of_year( date_time ) RESULT( day_of_year )
	448
	449	INTEGER(iwp) :: day_of_year !< day of the year
	450
	451	TYPE(date_time_type), INTENT(IN) :: date_time !< date of which to calculate day of year
	452	TYPE(date_time_type) :: date_time_internal !< internal copy of input date-time
	453
	454
	455	date_time_internal = update_leapyear_setting( date_time )
	456
	457	day_of_year = date_time_internal%day &
	458	+ SUM( date_time_internal%days_per_month(:date_time_internal%month-1) )
	459
	460	END FUNCTION get_day_of_year
	461
	462
	463	!--------------------------------------------------------------------------------------------------!
	464	! Description:
	465	! ------------
	466	!> Return second of day of given time.
	467	!--------------------------------------------------------------------------------------------------!
	468	FUNCTION get_second_of_day( date_time ) RESULT( second_of_day )
	469
	470	REAL(wp) :: second_of_day !< second of the day
	471
	472	TYPE(date_time_type), INTENT(IN) :: date_time !< date of which to calculate second of the day
	473
	474
	475	second_of_day = date_time%second &
	476	+ REAL( ( date_time%hour * minutes_per_hour ) + date_time%minute, KIND = wp ) &
	477	* seconds_per_minute
	478
	479	END FUNCTION get_second_of_day
	480
	481
	482	!--------------------------------------------------------------------------------------------------!
	483	! Description:
	484	! ------------
	485	!> Return second of year of given date-time.
	486	!--------------------------------------------------------------------------------------------------!
	487	FUNCTION get_second_of_year( date_time ) RESULT( second_of_year )
	488
	489	REAL(wp) :: second_of_year !< second of the year
	490
	491	TYPE(date_time_type), INTENT(IN) :: date_time !< date of which to calculate second of the year
	492
	493
	494	second_of_year = get_second_of_day( date_time ) &
	495	+ REAL( get_day_of_year( date_time ) - 1_iwp, KIND = wp ) * seconds_per_day
	496
	497	END FUNCTION get_second_of_year
	498
	499
	500	!--------------------------------------------------------------------------------------------------!
	501	! Description:
	502	! ------------
	503	!> Return index of the day of the week of the given date-time.
	504	!--------------------------------------------------------------------------------------------------!
	505	FUNCTION get_day_of_week( date_time_in ) RESULT( day_of_week )
	506
	507	INTEGER(iwp) :: date_time_internal_reference_day_of_week !< day of week of reference date
	508	INTEGER(iwp) :: day_difference !< day between given date and reference
	509	INTEGER(iwp) :: day_of_week !< day of the week
	510
	511	TYPE(date_time_type), INTENT(IN) :: date_time_in !< date of which to get the weekday
	512	TYPE(date_time_type) :: date_time_internal !< internal date-time
	513
	514	!
	515	!-- Define reference date from which on the current day of week can be determined
	516	date_time_internal%year = 2000_iwp
	517	date_time_internal%month = 1_iwp
	518	date_time_internal%day = 1_iwp
	519	date_time_internal_reference_day_of_week = 6_iwp
	520
	521	!
	522	!-- First, get the difference if both dates would be in the same year
	523	day_difference = get_day_of_year( date_time_in ) - get_day_of_year( date_time_internal )
	524	!
	525	!-- Now, shift the year and add the corresponding number of days to the difference
	526	IF ( date_time_internal%year < date_time_in%year ) THEN
	527
	528	DO WHILE ( date_time_internal%year /= date_time_in%year )
	529
	530	date_time_internal = update_leapyear_setting( date_time_internal )
	531	day_difference = day_difference + date_time_internal%days_per_year
	532
	533	date_time_internal%year = date_time_internal%year + 1_iwp
	534
	535	ENDDO
	536
	537	ELSEIF ( date_time_internal%year > date_time_in%year ) THEN
	538
	539	DO WHILE ( date_time_internal%year /= date_time_in%year )
	540
	541	date_time_internal%year = date_time_internal%year - 1_iwp
	542
	543	date_time_internal = update_leapyear_setting( date_time_internal )
	544	day_difference = day_difference - date_time_internal%days_per_year
	545
	546	ENDDO
	547
	548	ENDIF
	549	!
	550	!-- Remove full weeks of day_difference and shift day_of_week of reference by
	551	!-- remaining days
	552	day_of_week = date_time_internal_reference_day_of_week + MOD( day_difference, days_per_week )
	553
	554	IF ( day_of_week > days_per_week ) THEN
	555	!
	556	!-- Shift index again if it is next week (above days_per_week)...
	557	day_of_week = day_of_week - days_per_week
	558	ELSEIF ( day_of_week <= 0_iwp ) THEN
	559	!
	560	!-- ...or if it is last week (below 1)
	561	day_of_week = day_of_week + days_per_week
	562	ENDIF
	563
	564	END FUNCTION get_day_of_week
	565
	566
	567	!--------------------------------------------------------------------------------------------------!
	568	! Description:
	569	! ------------
	570	!> Check if given year is a leap year and update days per month accordingly.
	571	!--------------------------------------------------------------------------------------------------!
	572	FUNCTION update_leapyear_setting( date_time_in ) RESULT( date_time_out )
	573
	574	TYPE(date_time_type), INTENT(IN) :: date_time_in !< input date-time
	575	TYPE(date_time_type) :: date_time_out !< return date-time
	576
	577
	578	date_time_out = date_time_in
	579
	580	IF ( ANY( date_time_in%year == leap_years ) ) THEN
	581	date_time_out%days_per_month = days_per_month_leapyear
	582	ELSE
	583	date_time_out%days_per_month = days_per_month_noleapyear
	584	ENDIF
	585
	586	date_time_out%days_per_year = SUM( date_time_out%days_per_month )
	587
	588	END FUNCTION update_leapyear_setting
	589
	590
	591	!--------------------------------------------------------------------------------------------------!
	592	! Description:
	593	! ------------
	594	!> Check if given date and time are valid. Returns 0 if all checks are passed.
	595	!> @todo Revise error message. ATM, gives only last errorneous value even if
	596	!> multiple values violate the bounds.
	597	!--------------------------------------------------------------------------------------------------!
	598	FUNCTION check_date( date_time, date_time_str ) RESULT( error_code )
	599
	600
	601	CHARACTER(LEN=6), DIMENSION(7), PARAMETER :: error_str_list = & !< string used for error message
	602	(/'year ', 'month ', 'day ', 'hour ', 'minute', 'second', 'zone '/)
	603
	604	CHARACTER(LEN=date_time_str_len), INTENT(IN) :: date_time_str !< date-time as string
	605
	606	INTEGER(iwp) :: error_code !< error code
	607
	608	TYPE(date_time_type), INTENT(IN) :: date_time !< date-time to be checked
	609
	610
	611	error_code = 0
	612	!
	613	!-- Check date
	614	IF ( date_time%month < 1_iwp .OR. &
	615	date_time%month > months_per_year ) THEN
	616	error_code = 2
	617	ELSE
	618	IF ( date_time%day < 1_iwp .OR. &
	619	date_time%day > date_time%days_per_month(date_time%month) ) THEN
	620	error_code = 3
	621	ENDIF
	622	ENDIF
	623	!
	624	!-- Check time
	625	IF ( date_time%hour < 0_iwp .OR. &
	626	date_time%hour > hours_per_day ) THEN
	627	error_code = 4
	628	ELSE
	629	IF ( date_time%minute < 0_iwp .OR. &
	630	date_time%minute > minutes_per_hour ) THEN
	631	error_code = 5
	632	ELSE
	633	IF ( date_time%second < 0.0_wp .OR. &
	634	date_time%second >= seconds_per_minute ) THEN
	635	error_code = 6
	636	ENDIF
	637	ENDIF
	638	ENDIF
	639	!
	640	!-- Check time zone
	641	!-- Bounds defined by maximum and minimum time zone present on earth
	642	IF ( date_time%zone < -12_iwp .OR. &
	643	date_time%zone > 14_iwp ) THEN
	644	error_code = 7
	645	ENDIF
	646	!
	647	!-- Raise error if any check is marked invalid
	648	IF ( error_code /= 0 ) THEN
	649	WRITE( message_string, * ) 'Date-time values out of bounds: "' // &
	650	TRIM( error_str_list(error_code) ) // &
	651	'" is out of bounds. Please check date-time string: "' // &
	652	TRIM( date_time_str ) // '". ' // &
	653	'Format must be "YYYY-MM-DD hh:mm:ss ZZZ".'
	654	CALL message( 'check_date', 'PA0679', 2, 2, 0, 6, 0 )
	655	RETURN
	656	ENDIF
	657
	658	END FUNCTION check_date
	659
	660	END MODULE palm_date_time_mod

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