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date.md 5.33 KB

# date<a name="EN-US_TOPIC_0000001051770290"></a>

-   [Command Function](#section56472016338)
-   [Syntax](#section16635112512316)
-   [Parameter Description](#section15896030039)
-   [Usage](#section116361036636)
-   [Example](#section021711411237)
-   [Output](#section17950184414312)

## Command Function<a name="section56472016338"></a>

This command is used to query and set the system date and time.

## Syntax<a name="section16635112512316"></a>

date

date --help

date +\[_Format_\]

date -s_ _\[_YY/MM/DD_\]

date_ _-s_ _\[_hh:mm:ss_\]__

date -r \[_Filename_\]

## Parameter Description<a name="section15896030039"></a>

**Table  1**  Parameters

<a name="table3825mcpsimp"></a>
<table><thead align="left"><tr id="row3831mcpsimp"><th class="cellrowborder" valign="top" width="21%" id="mcps1.2.4.1.1"><p id="p3833mcpsimp"><a name="p3833mcpsimp"></a><a name="p3833mcpsimp"></a><strong id="b47334991913"><a name="b47334991913"></a><a name="b47334991913"></a>Parameter</strong></p>
</th>
<th class="cellrowborder" valign="top" width="50%" id="mcps1.2.4.1.2"><p id="p3835mcpsimp"><a name="p3835mcpsimp"></a><a name="p3835mcpsimp"></a><strong id="b1034575101910"><a name="b1034575101910"></a><a name="b1034575101910"></a>Description</strong></p>
</th>
<th class="cellrowborder" valign="top" width="28.999999999999996%" id="mcps1.2.4.1.3"><p id="p3837mcpsimp"><a name="p3837mcpsimp"></a><a name="p3837mcpsimp"></a><strong id="b10969161293"><a name="b10969161293"></a><a name="b10969161293"></a>Value Range</strong></p>
</th>
</tr>
</thead>
<tbody><tr id="row3838mcpsimp"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.2.4.1.1 "><p id="p3840mcpsimp"><a name="p3840mcpsimp"></a><a name="p3840mcpsimp"></a>--help</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.4.1.2 "><p id="p3842mcpsimp"><a name="p3842mcpsimp"></a><a name="p3842mcpsimp"></a>Uses the help.</p>
</td>
<td class="cellrowborder" valign="top" width="28.999999999999996%" headers="mcps1.2.4.1.3 "><p id="p3844mcpsimp"><a name="p3844mcpsimp"></a><a name="p3844mcpsimp"></a>N/A</p>
</td>
</tr>
<tr id="row3845mcpsimp"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.2.4.1.1 "><p id="p3847mcpsimp"><a name="p3847mcpsimp"></a><a name="p3847mcpsimp"></a>+Format</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.4.1.2 "><p id="p3849mcpsimp"><a name="p3849mcpsimp"></a><a name="p3849mcpsimp"></a>Prints the date and time based on <strong id="b3850mcpsimp"><a name="b3850mcpsimp"></a><a name="b3850mcpsimp"></a>Format</strong>.</p>
</td>
<td class="cellrowborder" valign="top" width="28.999999999999996%" headers="mcps1.2.4.1.3 "><p id="p3852mcpsimp"><a name="p3852mcpsimp"></a><a name="p3852mcpsimp"></a>Placeholders listed in <strong id="b34011737101518"><a name="b34011737101518"></a><a name="b34011737101518"></a>--help</strong>.</p>
</td>
</tr>
<tr id="row3853mcpsimp"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.2.4.1.1 "><p id="p3855mcpsimp"><a name="p3855mcpsimp"></a><a name="p3855mcpsimp"></a>-s YY/MM/DD</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.4.1.2 "><p id="p3857mcpsimp"><a name="p3857mcpsimp"></a><a name="p3857mcpsimp"></a>Sets the system date and separates the year, month, and day by slashes (/).</p>
</td>
<td class="cellrowborder" valign="top" width="28.999999999999996%" headers="mcps1.2.4.1.3 "><p id="p3859mcpsimp"><a name="p3859mcpsimp"></a><a name="p3859mcpsimp"></a>&gt;= 1970/01/01</p>
</td>
</tr>
<tr id="row3860mcpsimp"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.2.4.1.1 "><p id="p3862mcpsimp"><a name="p3862mcpsimp"></a><a name="p3862mcpsimp"></a>-s hh:mm:ss</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.4.1.2 "><p id="p3864mcpsimp"><a name="p3864mcpsimp"></a><a name="p3864mcpsimp"></a>Sets the system time and separates the hour, minute, and second by colons (:).</p>
</td>
<td class="cellrowborder" valign="top" width="28.999999999999996%" headers="mcps1.2.4.1.3 "><p id="p3866mcpsimp"><a name="p3866mcpsimp"></a><a name="p3866mcpsimp"></a>N/A</p>
</td>
</tr>
<tr id="row3867mcpsimp"><td class="cellrowborder" valign="top" width="21%" headers="mcps1.2.4.1.1 "><p id="p3869mcpsimp"><a name="p3869mcpsimp"></a><a name="p3869mcpsimp"></a>-r Filename</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.2.4.1.2 "><p id="p3871mcpsimp"><a name="p3871mcpsimp"></a><a name="p3871mcpsimp"></a>Queries the modification time of the <strong id="b16916585171"><a name="b16916585171"></a><a name="b16916585171"></a>Filename</strong> file.</p>
</td>
<td class="cellrowborder" valign="top" width="28.999999999999996%" headers="mcps1.2.4.1.3 "><p id="p3873mcpsimp"><a name="p3873mcpsimp"></a><a name="p3873mcpsimp"></a>N/A</p>
</td>
</tr>
</tbody>
</table>

## Usage<a name="section116361036636"></a>

-   If the  **date**  parameter is not specified, the current system date and time are displayed by default.
-   The  **--help**,  **+Format**,  **-s**, and  **-r**  parameters are mutually exclusive.

## Example<a name="section021711411237"></a>

Enter  **date +%Y--%m--%d**.

## Output<a name="section17950184414312"></a>

**Figure  1**  System date printed based on the specified format<a name="fig152576304517"></a>  
![](figures/system-date-printed-based-on-the-specified-format.png "system-date-printed-based-on-the-specified-format")

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提交于 2021-03-12 17:59 . !197 Docs Update version 1.0.1

date

Command Function
Syntax
Parameter Description
Usage
Example
Output

Command Function

This command is used to query and set the system date and time.

Syntax

date

date --help

date +[Format]

date -s_ _[YY/MM/DD]

date_ -s [hh:mm:ss]_

date -r [Filename]

Parameter Description

Table 1 Parameters

Parameter	Description	Value Range
--help	Uses the help.	N/A
+Format	Prints the date and time based on Format.	Placeholders listed in --help.
-s YY/MM/DD	Sets the system date and separates the year, month, and day by slashes (/).	>= 1970/01/01
-s hh:mm:ss	Sets the system time and separates the hour, minute, and second by colons (:).	N/A
-r Filename	Queries the modification time of the Filename file.	N/A

Usage

If the date parameter is not specified, the current system date and time are displayed by default.
The --help, +Format, -s, and -r parameters are mutually exclusive.

Example

Enter date +%Y--%m--%d.

Output

Figure 1 System date printed based on the specified format

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