Julian Date and Julian Day Number Calculator
Valid Over The Period From 1600 to 2200 on the Gregorian Calendar
Local Calendar Date
Year Month Day
Local Clock Time
00:00 to 24:00
Local Time Zone Offset From UT
Negative | Positive = West | East
UTC
Julian Date ============================================================================= Calendar Date Time Julian Date JD Num =============== ============ ================ ======= Local Date/Time LT 2024-Mar-28-Thu 14:13:35 LT 2460398.09276620 2460398 Local Time Zone TZ +00:00:00 TZ +0.00000000 Universal Time UTC 2024-Mar-28-Thu 14:13:35 UTC 2460398.09276620 2460398 Delta T Correction +00:01:09 DT +0.00080076 Terrestrial Time TT 2024-Mar-28-Thu 14:14:44 TT 2460398.09356696 2460398 TAI Correction -00:00:32.184 -0.00037250 Atomic Time TAI 2024-Mar-28-Thu 14:14:12 TAI 2460398.09319446 2460398 Astronomical JD TT 2460398.09356696 Horizons Delta T +69.185632 sec ============================================================================= ======================================== JD NUMBER TABLE Year:2024 | Month:Mar Gregorian Calendar Calendar Date JD Number Julian Date Year-Mmm-Dn-DoW JD at 12h JD at 00h ---------------- --------- ----------- 2024-Mar-01-Fri 2460371 2460370.5 2024-Mar-02-Sat 2460372 2460371.5 2024-Mar-03-Sun 2460373 2460372.5 2024-Mar-04-Mon 2460374 2460373.5 2024-Mar-05-Tue 2460375 2460374.5 2024-Mar-06-Wed 2460376 2460375.5 2024-Mar-07-Thu 2460377 2460376.5 2024-Mar-08-Fri 2460378 2460377.5 2024-Mar-09-Sat 2460379 2460378.5 2024-Mar-10-Sun 2460380 2460379.5 2024-Mar-11-Mon 2460381 2460380.5 2024-Mar-12-Tue 2460382 2460381.5 2024-Mar-13-Wed 2460383 2460382.5 2024-Mar-14-Thu 2460384 2460383.5 2024-Mar-15-Fri 2460385 2460384.5 2024-Mar-16-Sat 2460386 2460385.5 2024-Mar-17-Sun 2460387 2460386.5 2024-Mar-18-Mon 2460388 2460387.5 2024-Mar-19-Tue 2460389 2460388.5 2024-Mar-20-Wed 2460390 2460389.5 2024-Mar-21-Thu 2460391 2460390.5 2024-Mar-22-Fri 2460392 2460391.5 2024-Mar-23-Sat 2460393 2460392.5 2024-Mar-24-Sun 2460394 2460393.5 2024-Mar-25-Mon 2460395 2460394.5 2024-Mar-26-Tue 2460396 2460395.5 2024-Mar-27-Wed 2460397 2460396.5 2024-Mar-28-Thu 2460398 2460397.5 2024-Mar-29-Fri 2460399 2460398.5 2024-Mar-30-Sat 2460400 2460399.5 2024-Mar-31-Sun 2460401 2460400.5 ---------------- --------- ----------- Year-Mmm-Dn-DoW JD Number Julian Date Calendar Date JD at 12h JD at 00h ========================================
SYMBOLS, TIME SCALES AND RELATIONSHIPS LT = Local (Clock) Time TZ = Local Standard Time Zone Offset From UT (Negative|Positive = West|East) NOTE: When Daylight Saving or Summer Time is in effect, then the time zone offset is one hour less than under standard time. For example, the standard time zone offset for New York City, USA, is −5 hours when standard time is in effect but when Daylight Saving Time is in effect, the time zone offset from UT is −4 hours instead. Universal Time is always standard time. UT = Universal Time Scale = UT1 From 1600 to 1961 = UTC From 1962 onward = LT − (TZ) DT = Horizons Delta T (Could be negative or positive, depending on date.) = TT − UT TT = Terrestrial Time Scale (Used for formal astronomical computations.) = UT + (DT) = LT − (TZ) + (DT) TAI = International Atomic Time Scale = TT − 00:00:32.184 = LT - (TZ) + (DT) − 00:00:32.184 JD = Julian Date (a floating point decimal value). Contains both the complete calendar date and time of day information where the decimal fraction part indicates the time of day. JD Number = Julian Day Number (always an integer value). = Unique sequential serial number of the date on the calendar. It contains only the calendar date information. = floor(JD + 0.5) DoW = Day of Week index (0=Sun, 1=Mon, 2=Tue, 3=Wed, 4=Thu, 5=Fri, 6=Sat) = (floor(JD + 0.5) + 1) mod 7 = (JDNumber + 1) mod 7
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Julian Date and JD Number Calculator
Program by Jay Tanner
Revised: Thursday, January 01, 1970 at 12:00:00 AM UTC