Julian Date Conversion

R2026b

Calculate Julian date or modified Julian date

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  • Julian Date Conversion block

Libraries:
Aerospace Blockset / Utilities / Unit Conversions

Description

The Julian Date Conversion block converts the specified date to the Julian date or modified Julian date.

Limitations

  • This block is valid for all common era (CE) dates in the Gregorian calendar.

  • The calculation of Julian date does not take into account leap seconds.

Ports

Input

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Clock source for model simulation, specified as a scalar or array.

Dependencies

The presence and label of this port depends on the Time increment parameter.

PortTime increment Setting

day

Day

hour

Hour

min

Min

sec

Sec

No inport port

None

Data Types: double

Output

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Julian date, returned as a scalar or array.

Dependencies

Data Types: double

Parameters

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Year, specified as a scalar, to calculate the Julian date.

Programmatic Use

Block Parameter: year
Type: character vector
Values: double, greater than 1
Default: '2013'

Month to calculate the Julian date. From the list, select the month from January to December.

Programmatic Use

Block Parameter: month
Type: character vector
Values: 'January' | 'February' | 'March' | 'April' | 'May' | 'June' | 'July' | 'August' | 'September' | 'October' | 'November' | 'December'
Default: 'January'

Day to calculate the Julian date. From the list, select the day from 1 to 31.

Programmatic Use

Block Parameter: day
Type: character vector
Values: '1' | '2' | '3' | '4' | '5' | '5' | '6' | '7' | '8' | '9' | '10' | '11' | '12' | '13' | '14' | '15' | '16' | '17' | '18' | '19' | '20' | '21' | '22' | '23' | '24' | '25' | '26' | '27' | '28' | '29' | '30' | '31'
Default: '1'

Hour used to calculate the Julian date, specified as greater than or equal to 0 and less than 24.

Programmatic Use

Block Parameter: hour
Type: character vector
Values: double greater than or equal to 0 and less than 24
Default: '0'

Minutes to calculate the Julian date, specified as a double greater than or equal to 0 and less than 60.

Programmatic Use

Block Parameter: min
Type: character vector
Values: double greater than or equal to 0 and less than 60
Default: '0'

Specify the seconds used to calculate the Julian date, specified as a double greater than or equal to 0 and less than 60. Enter a number from 0 to 60.

Programmatic Use

Block Parameter: sec
Type: character vector
Values: double greater than or equal to 0 and less than 60
Default: '0'

Select this check box to calculate the modified Julian date (MJD) for corresponding elements of the year, month, day, hour, minute, and second.

Dependencies

Selecting this check box changes the output port label to MJD. Clearing this check box changes the output port label to JD.

Programmatic Use

Block Parameter: modflag
Type: character vector
Values: 'on' | 'off'
Default: 'off'

Time increment between the specified date and the desired model simulation time. The block adjusts the calculated Julian date to take into account the time increment from model simulation. For example, selecting Day and connecting a simulation timer to the port means that each time increment unit is one day and the block adjusts its calculation based on that simulation time.

If you select None, the calculated Julian date does not take into account the model simulation time. Selecting this option removes the first block input.

Dependencies

This parameter controls the presence and label of output port.

Time increment SettingPort

Day

day

Hour

hour

Min

min

Sec

sec

None

No inport port

Programmatic Use

Block Parameter: deltaT
Type: character vector
Values: 'Day' | 'Hour' | 'Min' | 'Sec' | 'None'
Default: 'Day'

Out-of-range block behavior, specified as follows.

ActionDescription

None

No action.

Warning

Warning in the Diagnostic Viewer, model simulation continues.

Error (default)

Error in the Diagnostic Viewer, model simulation stops.

Programmatic Use

Block Parameter: errorflag
Type: character vector
Values: 'None' | 'Warning' | 'Error'
Default: 'Error'

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"aerolibconvert2/Julian Date Conversion"

Example: add_block("aerolibconvert2/Julian Date Conversion","myModel/myBlock",MakeNameUnique="on")

Extended Capabilities

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C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2013b

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See Also