bash convert MMM-DD-YYYY variable to YYYY-MM-DD

Bash convert MMM-DD-YYYY variable to YYYY-MM-DD

To convert a date string in the format "MMM-DD-YYYY" (e.g., "Jan-15-2024") to "YYYY-MM-DD" format (e.g., "2024-01-15") in Bash, you can use the date command along with awk or cut for string manipulation. Here's how you can do it:

Using date and awk

#!/bin/bash # Example date string in MMM-DD-YYYY format date_string="Jan-15-2024" # Convert MMM-DD-YYYY to YYYY-MM-DD using date and awk converted_date=$(date -d "$(awk -F '-' '{print $2" "$1" "$3}' <<< "$date_string")" +"%Y-%m-%d") echo "Converted date: $converted_date"

Explanation

  1. awk Command (awk -F '-' '{print $2" "$1" "$3}' <<< "$date_string"):

    • -F '-': Specifies - as the field separator for awk.
    • '{print $2" "$1" "$3}': Reorders the fields to DD MMM YYYY.
    • <<< "$date_string": Feeds the date_string variable as input to awk.

  2. date Command (date -d "$(awk ...)" +"%Y-%m-%d"):

    • -d "$(awk ...)": Converts the formatted date string (DD MMM YYYY) back into a date object recognizable by date.
    • +"%Y-%m-%d": Specifies the desired output format (YYYY-MM-DD).

Running the Script

  • Replace date_string with your actual variable or input.
  • Run the script to see the converted date in YYYY-MM-DD format.

Alternative Using cut

You can also achieve the same result using cut:

#!/bin/bash # Example date string in MMM-DD-YYYY format date_string="Jan-15-2024" # Convert MMM-DD-YYYY to YYYY-MM-DD using cut and date converted_date=$(date -d "$(echo "$date_string" | cut -d'-' -f2,1,3)" +"%Y-%m-%d") echo "Converted date: $converted_date"

Explanation

  • cut Command (cut -d'-' -f2,1,3):
    • -d'-': Specifies - as the delimiter for cut.
    • -f2,1,3: Selects fields in the order DD, MMM, YYYY.
  • The rest of the script is similar to the previous example, using date to format the date.

Note

  • Ensure that your system's date command supports the -d option for specifying date strings. This is generally available in Linux distributions and macOS.
  • Adjust the script as needed if your input format varies slightly.

These scripts provide a straightforward way to convert date formats in Bash, leveraging standard commands like date, awk, and cut for string manipulation and date formatting.

Examples

  1. "Bash script to convert date from MMM-DD-YYYY to YYYY-MM-DD format"

    Description: This query explains how to convert a date string in MMM-DD-YYYY format to YYYY-MM-DD format using a bash script.

    Code:

    #!/bin/bash # Input date in MMM-DD-YYYY format input_date="Jul-19-2024" # Convert to YYYY-MM-DD format output_date=$(date -d "$input_date" +"%Y-%m-%d") echo "Converted date: $output_date"

  2. "Bash convert date string from MMM-DD-YYYY to YYYY-MM-DD using date command"

    Description: This query demonstrates how to use the date command in bash to convert a date string from MMM-DD-YYYY to YYYY-MM-DD.

    Code:

    #!/bin/bash # Input date input_date="Sep-30-2023" # Convert using date command output_date=$(date -d "$input_date" +"%Y-%m-%d") echo "Converted date: $output_date"

  3. "How to parse and convert MMM-DD-YYYY to YYYY-MM-DD in bash"

    Description: This query shows how to parse a date in MMM-DD-YYYY format and convert it to YYYY-MM-DD using bash string manipulation and the date command.

    Code:

    #!/bin/bash # Input date input_date="Mar-15-2025" # Extract components and convert month=$(date -d "$input_date" +"%m") day=$(date -d "$input_date" +"%d") year=$(date -d "$input_date" +"%Y") output_date="$year-$month-$day" echo "Converted date: $output_date"

  4. "Convert date from MMM-DD-YYYY to YYYY-MM-DD format in bash with error handling"

    Description: This query covers converting a date from MMM-DD-YYYY to YYYY-MM-DD format with error handling in bash.

    Code:

    #!/bin/bash # Input date input_date="Invalid-Date" # Convert with error handling if output_date=$(date -d "$input_date" +"%Y-%m-%d" 2>/dev/null); then echo "Converted date: $output_date" else echo "Error: Invalid date format" >&2 fi

  5. "Bash script to handle multiple dates in MMM-DD-YYYY format and convert to YYYY-MM-DD"

    Description: This query shows how to convert multiple dates from MMM-DD-YYYY to YYYY-MM-DD format using a bash script.

    Code:

    #!/bin/bash # Array of input dates input_dates=("Jan-01-2024" "Feb-15-2024" "Mar-31-2024") for input_date in "${input_dates[@]}"; do output_date=$(date -d "$input_date" +"%Y-%m-%d") echo "Converted date: $output_date" done

  6. "Bash convert MMM-DD-YYYY to YYYY-MM-DD using awk for date transformation"

    Description: This query demonstrates how to use awk for transforming dates from MMM-DD-YYYY to YYYY-MM-DD.

    Code:

    #!/bin/bash # Input date input_date="Apr-20-2024" # Convert using awk output_date=$(echo "$input_date" | awk -F'-' '{ "date -d " $1"-01-"$3" +%Y-%m-%d" | getline x; print x }') echo "Converted date: $output_date"

  7. "Bash convert date format MMM-DD-YYYY to YYYY-MM-DD using date and month array"

    Description: This query demonstrates how to convert dates using a month array in bash.

    Code:

    #!/bin/bash # Input date input_date="Jun-05-2024" # Month array declare -A month_map=(["Jan"]=01 ["Feb"]=02 ["Mar"]=03 ["Apr"]=04 ["May"]=05 ["Jun"]=06 ["Jul"]=07 ["Aug"]=08 ["Sep"]=09 ["Oct"]=10 ["Nov"]=11 ["Dec"]=12) # Extract components month=${input_date%-*} month=${month_map[${month}]} day=${input_date#*-} day=${day%-*} year=${input_date##*-} # Format output output_date="$year-$month-$day" echo "Converted date: $output_date"

  8. "Bash script to convert MMM-DD-YYYY to YYYY-MM-DD considering locale settings"

    Description: This query shows how to convert a date considering locale settings to ensure correct month abbreviations are parsed.

    Code:

    #!/bin/bash # Set locale export LC_TIME="en_US.UTF-8" # Input date input_date="Oct-10-2024" # Convert output_date=$(date -d "$input_date" +"%Y-%m-%d") echo "Converted date: $output_date"

  9. "Bash convert MMM-DD-YYYY to YYYY-MM-DD with different year formats"

    Description: This query demonstrates converting dates with various year formats from MMM-DD-YYYY to YYYY-MM-DD.

    Code:

    #!/bin/bash # Input dates input_dates=("Dec-31-99" "Jan-01-2000") for input_date in "${input_dates[@]}"; do output_date=$(date -d "$input_date" +"%Y-%m-%d") echo "Converted date: $output_date" done

  10. "Automate date conversion from MMM-DD-YYYY to YYYY-MM-DD in bash with user input"

    Description: This query shows how to automate the date conversion process using user input for the date.

    Code:

    #!/bin/bash # Prompt user for input date read -p "Enter date in MMM-DD-YYYY format: " input_date # Convert date output_date=$(date -d "$input_date" +"%Y-%m-%d") echo "Converted date: $output_date"

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