- Convert Julian Date To Calendar Date In Unix
- Bash Script Convert Julian Date To A Calendar Date 2019
- Bash Script Convert Julian Date To A Calendar Date Calendar
Convert Julian date to Calendar date Hello everyone, I'm hoping there is an existing method for taking a Julian date and turning it into a Calender date (Because if not I'll have to look into creating a script, which I would like to avoid if possible). Converting Between Unix Timestamp and Julian Date. Depending on your version of Origin, there are a couple of ways to convert between a Unix timestamp and a Julian Date: Beginning with Origin 2020b, you can use Origin's UnixTime( ) function to convert values in either direction. The date command can be combined in shell scripts to, for example, easily append a date to file you are editing. Along with the calendar date, the time can also be specified. Here are a few examples. You can display today's date with: $ date. Wed Nov 2 21:20:22 EDT 2016. You can also convert from one date format to another. For example, to. Converts a gregorian calender date to julian day format:dayOfYear: returns the day of the year, i.e. 1 for 1/1/2008, 266 for:DeleteIfOld: deletes file or directory if older than given number of days:ftime: returns the file time in julian days:jdate: converts a date string to julian day number with respect to regional date format.
date` command to display or change the current date and time value of the system. Date and time value can be printed in different formats by using this command. This command can also be used for calculating date and time value related tasks. `date` command without any option just prints the current system's date and time value. This command has many formatting options to format the output. The uses of these options are shown in this tutorial by using various examples.Syntax:
date[option][MMDDhhmm [[CC] YY][.ss]]
Different format codes or characters can be used with the date options to generate the formatted output. Some common options and format types are mentioned below.
Options:
| -d or –date=String | It displays the time set by the String value. |
| -s, –set=String | It sets the time set by the String value. |
| -f or –file=DateFile | It is used to process multiple dates. |
| -I or –iso-8601[=Timespec] | It is used to create an ISO 8601 compliant date/time string output. |
| -r or –reference=File | It is used to display the last modification time of a file. |
| -u, –utc, –universal | It is used to display or set Coordinated Universal Time. |
| –help | It is used for getting the help of this command. |
| –version | It is used to get version information. |
Some Format codes:
| %a | Print weekday names in short form (e.g., Sun) |
| %A | Print full weekday names (e.g., Sunday) |
| %b | Print month name in short form (e.g., Jan) |
| %B | Print full month name (e.g., January) |
| %c | Print date and time (e.g., Mon Mar 11 23:05:25 2019) |
| %C | Print century; like %Y, except omit last two digits (e.g., 25) |
| %d | Print day of the month (e.g, 01) |
| %Y | Print 4 digits year (e.g. 2019) |
| %y | Print 2 digits year (e.g. 19) |
| %D | Print date; same as %m/%d/%y |
| %e | Print day of the month, same as, %d |
| %F | Print full date; same as, %Y-%m-%d |
Example-1: Display date in the particular format
By default `date` displays the current date and time value. Each part of date and time values can be printed separately by using different data options. The following command will print the date value only.
Output:
Here, ‘%d' is used for printing day value, ‘%B' is used for printing full month name and ‘%Y' is used for printing full year value.
Example-2: Change the current date and time
The current date and time value can be changed by using -s option. You must have root privilege to change the system's date and time. The following command will change the current date to ‘03/17/2019' and time to ‘03:30:00‘.
Output:
Example-3: Find the particular date and time using days
Sometimes we need to find out the future or previous date and time. Any date can find out by using `date` command and defining days, month and year values in –date option. The following commands will calculate the date and time after 15 days and before 15 days.
Output:
Example-4: Find the particular date and time using times
Like the previous example, future or previous times can be calculated by using `date` command. The following commands will calculate the future time after ‘5 hours 20 minutes' of current times and before 2 hours and 20 minutes of current times.
$ date--date='5 hours 20 minutes'
$ date
$ date--date='-2 hours -20 minutes'
Output:
Example-5: Convert current date and time to UNIX epoch time
According to UNIX epoch time, the time value is calculated in seconds from the date, 1st January 1971. This time value can be used to calculate the time difference. `date` command can be used to convert any date value to UNIX epoch time. The following command will convert the current system date and time to UNIX epoch time.
Output:
Example-6: Convert UNIX epoch time to date and time
Using `date` command anyone can convert any UNIX epoch time to date and time value. The following command converts ‘1552298500′ epoch value to its corresponding date and time value.
Output:
Example-7: Find out the weekday based on date
`date` command can be used to find out the weekday name, month name or year value from any date value. The following command will find the weekday name of 1st January 2019 and the output is ‘Tuesday'.
Output:
Example-8: Using date command in a bash script
A bash file named timediff.sh is created with the following code. In this script, two date values are taken from command line arguments which are stored on $1 and $2. $START variable stored the UNIX epoch time value of $1 and $END variable stored the UNIX epoch time value of $2. The difference between these two values is calculated and stored to $diff variable in seconds. Next, the seconds are converted to days and printed.
timediff.sh
START=`date-d$1 +%s`
END=`date-d$2 +%s`
((diff=$END-$START))
((days=$diff/(60*60*24)))
echo'The time escaped = $days days'
The script is executed with two date values as command line arguments. Here, 2019-01-01 and 2020-01-01 dates are used and the difference between these two dates is 365 days.
Conclusion
You can use `date` command for various purposes in the bash script. Some uses of date values are explained in this tutorial with the above examples. You can also use this command to separate the parts of time value by using different options and formats. Hope, this tutorial will help the readers to understand the use of `date` command and apply them properly.
In this article you'll learn, how to convert a Julian date to a calendar date.
What is Julian date?
Julian date calendar was introduced by Julius Caesar. The length of Julian date is 5, in which first 2 digits represt the year and last 3 digits represent the day of the year.
For example:-
- 1st January 2008, Julian date 08001. Where '08' being the year and '001' being the date
To convert the Julian date format to a calendar date, we use IF, LEFT and MOD function in Microsoft Excel.
Convert Julian Date To Calendar Date In Unix
Let's take an example,
The script is executed with two date values as command line arguments. Here, 2019-01-01 and 2020-01-01 dates are used and the difference between these two dates is 365 days.
Conclusion
You can use `date` command for various purposes in the bash script. Some uses of date values are explained in this tutorial with the above examples. You can also use this command to separate the parts of time value by using different options and formats. Hope, this tutorial will help the readers to understand the use of `date` command and apply them properly.
In this article you'll learn, how to convert a Julian date to a calendar date.
What is Julian date?
Julian date calendar was introduced by Julius Caesar. The length of Julian date is 5, in which first 2 digits represt the year and last 3 digits represent the day of the year.
For example:-
- 1st January 2008, Julian date 08001. Where '08' being the year and '001' being the date
To convert the Julian date format to a calendar date, we use IF, LEFT and MOD function in Microsoft Excel.
Convert Julian Date To Calendar Date In Unix
Let's take an example,
In Column A we have Julian date and in column B we want to convert Julian date into calendar date.
Follow below given steps:-
- Enter the formula in cell B2
- =('1/1/'&(IF(LEFT(A2,2)*1<20,2000,1900)+LEFT(A2,2)))+MOD(A2,1000)-1
- Press Enter
- The function will convert the Julian date format in to Calendar date
Bash Script Convert Julian Date To A Calendar Date 2019
- Copy the same formula by pressing the key Ctrl+C and paste in the range B3:B10 by pressing the key Ctrl+V on your keyboard
Formula Explanation:-
- (IF(LEFT(A2,2)*1<20,2000,1900)+LEFT(A2,2))) :- This part of formula will help to get the year
- MOD(A2,1000) :- This part of formula will help to get the number of days
- By using rest part formula will calculate the date as number, because excel has stored the date as numbers.
In this way, we can convert the Julian date to a calendar date in Microsoft Excel.
Important Note:- To convert the 4 digit's Julian date into calendar date we have to convert Julian date into text format.
Take a look at the below example,
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Bash Script Convert Julian Date To A Calendar Date Calendar
