Linux-cliHow-ToBeginner · 3 min read

How to Use Date Command in Linux: Syntax and Examples

The date command in Linux shows the current date and time or formats a specified date/time. You can customize output using format options like +%Y-%m-%d to display the date as year-month-day.

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Syntax

The basic syntax of the date command is:

date: Displays the current date and time.
date [OPTION]... [+FORMAT]: Shows date/time formatted according to FORMAT.
date -d 'STRING': Displays the date/time described by STRING instead of now.

Common format specifiers include:

%Y: Year (4 digits)
%m: Month (01-12)
%d: Day of month (01-31)
%H: Hour (00-23)
%M: Minute (00-59)
%S: Second (00-59)

bash

date [+FORMAT]
date -d 'STRING'

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Example

This example shows how to display the current date in year-month-day format and how to show the date for a specific day.

bash

date +"%Y-%m-%d"
date -d "2024-01-01" +"%A, %B %d, %Y"

Output

2024-06-15 Monday, January 01, 2024

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Common Pitfalls

Common mistakes include:

Forgetting the + before the format string, which causes the format to be ignored.
Using incorrect format specifiers that produce unexpected output.
Not quoting the date string with -d, which can cause parsing errors.

bash

date "%Y-%m-%d"  # Wrong: missing + before format

# Correct usage:
date +"%Y-%m-%d"

# Wrong usage without quotes for -d:
date -d 2024-01-01

# Correct usage with quotes:
date -d "2024-01-01"

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Quick Reference

Option/Format	Description	Example Output
date	Show current date and time	Sat Jun 15 14:30:00 UTC 2024
date +"%Y-%m-%d"	Show date as year-month-day	2024-06-15
date -d "tomorrow"	Show date for tomorrow	Sun Jun 16 14:30:00 UTC 2024
date +"%H:%M:%S"	Show current time in 24-hour format	14:30:00
date -d "2024-01-01" +"%A"	Show day of week for a date	Monday

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Key Takeaways

Always use a plus sign (+) before format strings to customize output.

Use -d with quotes to specify a different date or time to display.

Common format codes like %Y, %m, and %d help format dates clearly.

The date command can show current or any specified date/time easily.

Quoting strings and formats avoids parsing errors and unexpected results.