calcal
Calendrical Calculations

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calcal: Calendrical Calculations
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API for calcal
Calendrical Calculations

Global functions
aberration Source code
advent Man page Source code
afrench_date Man page Source code
amod Source code
angle Source code
apersian_date Man page Source code
apparent_from_local Source code
apparent_from_universal Source code
approx_moment_of_depression Source code
arc_of_light Source code
arc_of_vision Source code
arccos_degrees Source code
arcsin_degrees Source code
arctan_degrees Source code
arithmetic_french_from_fixed Source code
arithmetic_french_leap_year Source code
arithmetic_persian_from_fixed Source code
arithmetic_persian_leap_year Source code
arithmetic_persian_year_from_fixed Source code
armenian_date Man page Source code
armenian_from_fixed Source code
as.Date.rdvec Source code
as.character.rdvec Source code
as.data.frame.rdvec Source code
as.list.rdvec Source code
as_afrench Man page Source code
as_apersian Man page Source code
as_armenian Man page Source code
as_babylonian Man page Source code
as_bahai Man page Source code
as_balinese Man page Source code
as_chinese Man page Source code
as_coptic Man page Source code
as_date Man page Source code
as_date.Date Source code
as_date.character Source code
as_date.default Source code
as_date.list Source code
as_date.numeric Source code
as_date.rdvec Source code
as_egyptian Man page Source code
as_ethiopic Man page Source code
as_french Man page Source code
as_gregorian Man page Source code
as_hebrew Man page Source code
as_hindu_lunar Man page Source code
as_hindu_solar Man page Source code
as_icelandic Man page Source code
as_islamic Man page Source code
as_iso Man page Source code
as_japanese Man page Source code
as_julian Man page Source code
as_korean Man page Source code
as_mayan Man page Source code
as_ohebrew Man page Source code
as_oislamic Man page Source code
as_old_hindu_lunar Man page Source code
as_old_hindu_solar Man page Source code
as_persian Man page Source code
as_roman Man page Source code
as_samaritan Man page Source code
as_saudi Man page Source code
as_tibetan Man page Source code
as_time_of_day Man page Source code
as_time_of_day.POSIXct Source code
as_time_of_day.POSIXlt Source code
as_time_of_day.default Source code
as_time_of_day.numeric Source code
as_time_of_day.rdvec Source code
as_vietnamese Man page Source code
asian_from_fixed Source code
astro_bahai_new_year_on_or_before Source code
astronomical_easter Man page Source code
auc_year_from_julian Source code
ayanamsha Source code
babylonian_criterion Source code
babylonian_date Man page Source code
babylonian_from_fixed Source code
babylonian_leap_year_p Source code
babylonian_new_month_on_or_before Source code
bahai_date Man page Source code
bahai_from_fixed Source code
bahai_new_year Man page Source code
bahai_sunset Source code
bali_asatawara_from_fixed Source code
bali_caturwara_from_fixed Source code
bali_dasawara_from_fixed Source code
bali_day_from_fixed Source code
bali_dwiwara_from_fixed Source code
bali_luang_from_fixed Source code
bali_on_or_before Source code
bali_pancawara_from_fixed Source code
bali_pawukon_from_fixed Source code
bali_sadwara_from_fixed Source code
bali_sangawara_from_fixed Source code
bali_saptawara_from_fixed Source code
bali_triwara_from_fixed Source code
bali_week_from_fixed Source code
balinese_date Man page Source code
base_granularities Source code
bce Source code
binary_search Source code
binary_search_single Source code
birth_of_the_bab Man page Source code
bruin_best_view Source code
cal_afrench Man page
cal_apersian Man page
cal_armenian Man page
cal_babylonian Man page
cal_bahai Man page
cal_balinese Man page
cal_chinese Man page
cal_coptic Man page
cal_egyptian Man page
cal_ethiopic Man page
cal_french Man page
cal_gregorian Man page
cal_hebrew Man page
cal_hindu_lunar Man page
cal_hindu_solar Man page
cal_icelandic Man page
cal_islamic Man page
cal_iso Man page
cal_japanese Man page
cal_julian Man page
cal_korean Man page
cal_mayan Man page
cal_ohebrew Man page
cal_oislamic Man page
cal_old_hindu_lunar Man page
cal_old_hindu_solar Man page
cal_persian Man page
cal_roman Man page
cal_samaritan Man page
cal_saudi Man page
cal_tibetan Man page
cal_vietnamese Man page
calcal Man page
calcal-package Man page
calcal-vctrs Man page
ce Source code
chinese_age Source code
chinese_branch Source code
chinese_date Man page Source code
chinese_day_name Source code
chinese_day_name_on_or_before Source code
chinese_from_fixed Source code
chinese_location Source code
chinese_month_name Source code
chinese_name Source code
chinese_name_difference Source code
chinese_new_moon_before Source code
chinese_new_moon_on_or_after Source code
chinese_new_year Man page Source code
chinese_new_year_in_sui Source code
chinese_new_year_on_or_before Source code
chinese_no_major_solar_term Source code
chinese_prior_leap_month Source code
chinese_sexagesimal_name Source code
chinese_solar_longitude_on_or_after Source code
chinese_stem Source code
chinese_winter_solstice_on_or_before Source code
chinese_year_marriage_augury Source code
chinese_year_name Source code
christmas Man page Source code
classical_passover_eve Source code
clock_from_moment Source code
coptic_christmas Man page Source code
coptic_date Man page Source code
coptic_from_fixed Source code
coptic_in_gregorian Source code
coptic_leap_year Source code
cos_degrees Source code
current_major_solar_term Source code
current_minor_solar_term Source code
dates2_in_gregorian Source code
dates3_in_gregorian Source code
dawn Source code
day_of_month Man page Source code
day_of_week Man page Source code
day_of_week.apersian Source code
day_of_week.bahai Source code
day_of_week.coptic Source code
day_of_week.default Source code
day_of_week.ethiopic Source code
day_of_week.french Source code
day_of_week.gregorian Source code
day_of_week.hebrew Source code
day_of_week.icelandic Source code
day_of_week.islamic Source code
day_of_week.iso Source code
day_of_week.julian Source code
day_of_week.persian Source code
day_of_week.tibetan Source code
day_of_week_from_fixed Source code
day_of_year Man page Source code
days_in_hebrew_year Source code
days_remaining Man page Source code
daytime_temporal_hour Source code Source code
declination Source code
deg Source code
degrees_from_radians Source code
diwali Man page Source code
dragon_festival Man page Source code
dusk Source code
dynamical_from_universal Source code Source code
early_month_p Source code
easter Man page Source code
egyptian_date Man page Source code
egyptian_from_fixed Source code
eid_al_adha Man page Source code
eid_al_fitr Man page Source code
elevation Source code
ephemeris_correction Source code
epiphany Man page Source code
equation_of_time Source code
estimate_prior_solar_longitude Source code
ethiopic_date Man page Source code
ethiopic_from_fixed Source code
feast_of_ridvan Man page Source code
final_value Source code
first_kday Source code
fixed_from_arithmetic_french Source code
fixed_from_arithmetic_persian Source code
fixed_from_armenian Source code
fixed_from_asian Source code
fixed_from_astro_bahai Source code
fixed_from_babylonian Source code
fixed_from_bahai Source code
fixed_from_bali Source code
fixed_from_chinese Source code
fixed_from_coptic Source code
fixed_from_egyptian Source code
fixed_from_ethiopic Source code
fixed_from_french Source code
fixed_from_gregorian Source code
fixed_from_hebrew Source code
fixed_from_hindu_fullmoon Source code
fixed_from_hindu_lunar Source code
fixed_from_hindu_solar Source code
fixed_from_icelandic Source code
fixed_from_islamic Source code
fixed_from_iso Source code
fixed_from_japanese Source code
fixed_from_jd Source code Source code
fixed_from_julian Source code
fixed_from_korean Source code
fixed_from_mayan_long_count Source code
fixed_from_mjd Source code
fixed_from_molad Source code
fixed_from_moment Source code
fixed_from_observational_hebrew Source code
fixed_from_observational_islamic Source code
fixed_from_old_hindu_lunar Source code
fixed_from_old_hindu_solar Source code
fixed_from_persian Source code
fixed_from_roman Source code
fixed_from_samaritan Source code
fixed_from_saudi_islamic Source code
fixed_from_tibetan Source code
fixed_from_vietnamese Source code
format.location Source code
format.rdvec Source code
format.time_of_day Source code
format_armenian Source code
format_babylonian Source code
format_bahai Source code
format_coptic Source code
format_date Source code
format_egyptian Source code
format_ethiopic Source code
format_french Source code
format_gregorian Source code
format_hebrew Source code
format_hindu_lunar Source code
format_hindu_solar Source code
format_icelandic Source code
format_islamic Source code
format_julian Source code
format_persian Source code
format_roman Source code
format_tibetan Source code
french_date Man page Source code
french_from_fixed Source code
french_leap_year Source code
french_new_year_on_or_before Source code
from_radix Source code
full_moons Man page Source code
get_calendar Source code
get_new_moon_at_or_after Source code
get_new_moon_before Source code
granularity Man page Source code
granularity_names Man page Source code
gregorian_date Man page Source code
gregorian_from_fixed Source code
gregorian_leap_year Source code
gregorian_new_year Source code
gregorian_year_end Source code
gregorian_year_from_fixed Source code
gregorian_year_range Source code
hanukkah Man page Source code
hebrew_birthday Source code
hebrew_birthday_in_gregorian Source code
hebrew_calendar_elapsed_days Source code
hebrew_date Man page Source code
hebrew_from_fixed Source code
hebrew_in_gregorian Source code
hebrew_leap_year Source code
hebrew_new_year Source code
hebrew_sabbatical_year Source code
hebrew_year_length_correction Source code
hindu_arcsin Source code
hindu_arcsin_positive Source code
hindu_ascensional_difference Source code
hindu_calendar_year Source code
hindu_daily_motion Source code
hindu_date_occur Source code
hindu_day_count Source code
hindu_equation_of_time Source code
hindu_expunged Source code
hindu_fullmoon_from_fixed Source code
hindu_lunar_date Man page Source code
hindu_lunar_day_at_or_after Source code
hindu_lunar_day_from_moment Source code
hindu_lunar_event Source code
hindu_lunar_from_fixed Source code
hindu_lunar_holiday Source code
hindu_lunar_longitude Source code
hindu_lunar_new_year Man page Source code
hindu_lunar_on_or_before Source code
hindu_lunar_phase Source code
hindu_lunar_station Source code
hindu_mean_position Source code
hindu_new_moon_before Source code
hindu_rising_sign Source code
hindu_sine Source code
hindu_sine_table Source code
hindu_solar_date Man page Source code
hindu_solar_from_fixed Source code
hindu_solar_longitude Source code
hindu_solar_longitude_at_or_after Source code
hindu_solar_sidereal_difference Source code
hindu_standard_from_sundial Source code
hindu_sunrise Source code
hindu_sunset Source code
hindu_tithi_occur Source code
hindu_tropical_longitude Source code
hindu_true_position Source code
hindu_zodiac Source code
hr Source code
icelandic_date Man page Source code
icelandic_from_fixed Source code
icelandic_leap_year Source code
icelandic_summer Source code
icelandic_winter Source code
ides_of_month Source code
in_range Source code
invert_angular Source code
islamic_date Man page Source code
islamic_from_fixed Source code
islamic_in_gregorian Source code
islamic_leap_year Source code
islamic_new_year Man page Source code
iso_date Man page Source code
iso_from_fixed Source code
iso_long_year Source code
japanese_date Man page Source code
japanese_from_fixed Source code
japanese_location Source code
jd_from_fixed Source code Source code
jd_from_moment Source code Source code
jewish_dusk Source code
jewish_sabbath_ends Source code
jovian_year Source code
julian_centuries Source code
julian_date Man page Source code
julian_from_fixed Source code
julian_in_gregorian Source code
julian_leap_year Source code
julian_year_from_auc Source code
julian_year_from_olympiad Source code
kajeng_keliwon Man page Source code
karana Source code
kday_after Source code
kday_before Source code
kday_nearest Source code
kday_on_or_after Source code
kday_on_or_before Source code
korean_date Man page Source code
korean_from_fixed Source code
korean_location Source code
korean_year Source code
last_day_of_gregorian_month Source code
last_day_of_hebrew_month Source code
last_kday Source code
last_month_of_hebrew_year Source code
latitude Source code
list_range Source code
local_from_apparent Source code
local_from_standard Source code
local_from_universal Source code
location Man page Source code
long_marheshvan Source code
longitude Source code
losar Man page Source code
lunar_altitude Source code
lunar_anomaly Source code
lunar_diameter Source code
lunar_distance Source code
lunar_elongation Source code
lunar_latitude Source code
lunar_longitude Source code
lunar_node Source code
lunar_parallax Source code
lunar_phase Man page Source code
lunar_phase_at_or_after Source code
lunar_phase_at_or_before Source code
lunar_semi_diameter Source code
major_solar_term_on_or_after Source code
mawlid Man page Source code
mayan_date Man page Source code
mayan_long_count_from_fixed Source code
mean_lunar_longitude Source code
mesha_sankranti Man page Source code
midday Source code
midday_in_tehran Source code
midnight Source code
midnight_in_china Source code
midnight_in_paris Source code
minor_solar_term_on_or_after Source code
mins Source code
mjd_from_fixed Source code
mn Source code
mod3 Source code
molad Source code
moment_from_jd Source code Source code
moment_of_depression Source code
month_length Source code
month_of_year Man page Source code
moon_node Source code
moonlag Source code
moonrise Man page Source code
moonset Man page Source code
mt Source code
naw_ruz Man page Source code
new_calendar Man page Source code
new_date Man page Source code
new_moon_at_or_after Source code
new_moon_before Source code
new_moons Man page Source code
new_rdvec Source code
next_value Source code
next_value2 Source code
nighttime_temporal_hour Source code Source code
nones_of_month Source code
nowruz Source code
nth_kday Source code
nth_new_moon Source code
nutation Source code
obj_print_header.rdvec Source code
obliquity Source code
observational_hebrew_first_of_nisan Source code
observational_hebrew_from_fixed Source code
observational_islamic_from_fixed Source code
observed_lunar_altitude Source code
ohebrew_date Man page Source code
oislamic_date Man page Source code
old_hindu_lunar_date Man page Source code
old_hindu_lunar_from_fixed Source code
old_hindu_lunar_leap_year Source code
old_hindu_solar_date Man page Source code
old_hindu_solar_from_fixed Source code
olympiad Source code
olympiad_cycle Source code
olympiad_from_julian_year Source code
olympiad_year Source code
omer Source code
orthodox_christmas Man page Source code
orthodox_easter Man page Source code
passover Man page Source code
pentecost Man page Source code
persian_date Man page Source code
persian_from_fixed Source code
persian_new_year_on_or_before Source code
phasis_on_or_after Source code
phasis_on_or_before Source code
poly Source code
positions_in_range Source code
precession Source code
print.calendar Source code
purim Man page Source code
qing_ming Man page Source code
radians_from_degrees Source code
rama Man page Source code
ramadan Man page Source code
refraction Source code
right_ascension Source code
roman_date Man page Source code
roman_from_fixed Source code
rosh_hashanah Man page Source code
sacred_wednesdays Man page Source code
sacred_wednesdays_in_range Source code
samaritan_date Man page Source code
samaritan_from_fixed Source code
samaritan_new_moon_after Source code
samaritan_new_moon_at_or_before Source code
samaritan_new_year_on_or_before Source code
samaritan_noon Source code
saudi_criterion Source code
saudi_date Man page Source code
saudi_islamic_from_fixed Source code
saudi_new_month_on_or_before Source code
season_in_gregorian Source code
sec Source code
secs Source code
shaukat_criterion Source code
shavuot Man page Source code
shiva Man page Source code
short_kislev Source code
sidereal_from_moment Source code
sidereal_solar_longitude Source code
simple_best_view Source code
sin_degrees Source code
sine_offset Source code
solar_altitude Source code
solar_anomaly Source code
solar_longitude Source code
solar_longitude_after Source code
standard_from_local Source code
standard_from_sundial Source code
standard_from_universal Source code
sukkot Man page Source code
sunrise Man page Source code
sunset Man page Source code
ta_anit_esther Man page Source code
tan_degrees Source code
tibetan_date Man page Source code
tibetan_from_fixed Source code
tibetan_leap_day_p Source code
tibetan_leap_month_p Source code
tibetan_moon_equation Source code
tibetan_new_year Man page Source code
tibetan_sun_equation Source code
time_from_moment Source code
time_of_day Man page Source code
tishah_be_av Man page Source code
to_radix Source code
topocentric_lunar_altitude Source code
tumpek Man page Source code
universal_from_apparent Source code
universal_from_dynamical Source code
universal_from_local Source code
universal_from_standard Source code
unlucky_fridays Man page Source code
us_daylight_saving_end Man page Source code
us_daylight_saving_start Man page Source code
us_election_day Man page Source code
us_independence_day Man page Source code
us_labor_day Man page Source code
us_memorial_day Man page Source code
validate_afrench Source code
validate_babylonian Source code
validate_bahai Source code
validate_balinese Source code
validate_chinese Source code
validate_coptic Source code
validate_egyptian Source code
validate_french Source code
validate_gregorian Source code
validate_hebrew Source code
validate_hindu_lunar Source code
validate_hindu_solar Source code
validate_icelandic Source code
validate_islamic Source code
validate_iso Source code
validate_julian Source code
validate_korean Source code
validate_locale Source code
validate_mayan_long_count Source code
validate_persian Source code
validate_roman Source code
validate_tibetan Source code
validate_time Source code
vec_arith.numeric.rdvec Source code
vec_arith.numeric.time_of_day Source code
vec_arith.rdvec Source code
vec_arith.rdvec.numeric Source code
vec_arith.rdvec.rdvec Source code
vec_arith.time_of_day Source code
vec_arith.time_of_day.numeric Source code
vec_arith.time_of_day.time_of_day Source code
vec_cast.double.rdvec Source code
vec_cast.double.time_of_day Source code
vec_cast.integer.rdvec Source code
vec_cast.rdvec.double Source code
vec_cast.rdvec.integer Source code
vec_cast.rdvec.rdvec Source code
vec_ptype2.double.rdvec Source code
vec_ptype2.integer.rdvec Source code
vec_ptype2.location.location Source code
vec_ptype2.rdvec.double Source code
vec_ptype2.rdvec.integer Source code
vec_ptype2.rdvec.rdvec Source code
vec_ptype2.time_of_day.time_of_day Source code
vec_ptype_abbr.location Source code
vec_ptype_abbr.rdvec Source code
vietnamese_date Man page Source code
vietnamese_from_fixed Source code
vietnamese_location Source code
visible_crescent Source code
week_of_month Man page Source code
week_of_year Man page Source code
yahrzeit Source code
yahrzeit_in_gregorian Source code
yallop_criterion Source code
year Man page Source code
yoga Source code
yom_kippur Man page Source code
zone Source code
zone_from_longitude Source code
calcal documentation built on Feb. 25, 2026, 9:07 a.m.

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