harmony 鸿蒙@ohos.systemDateTime (System Time and Time Zone)

2023-02-03
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@ohos.systemDateTime (System Time and Time Zone)

The systemDateTime module provides system time and time zone features. You can use the APIs of this module to set and obtain the system time and time zone.

NOTE

The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.

Modules to Import

import systemDateTime from '@ohos.systemDateTime';

TimeType¹⁰⁺

Enumerates the types of time to obtain.

System capability: SystemCapability.MiscServices.Time

Name	Value	Description
STARTUP	0	Number of milliseconds elapsed since system startup, including the deep sleep time.
ACTIVE	1	Number of milliseconds elapsed since system startup, excluding the deep sleep time.

systemDateTime.setTime

setTime(time : number, callback : AsyncCallback<void>) : void

Sets the system time. This API uses an asynchronous callback to return the result.

System API: This is a system API.

System capability: SystemCapability.MiscServices.Time

Required permissions: ohos.permission.SET_TIME

Parameters

Name	Type	Mandatory	Description
time	number	Yes	Timestamp to set, in milliseconds.
callback	AsyncCallback<void>	Yes	Callback used to return the result.

Example

import { BusinessError } from '@ohos.base';

// Set the system time to 2021-01-20 02:36:25.
let time = 1611081385000;
try {
  systemDateTime.setTime(time, (error: BusinessError) => {
    if (error) {
      console.info(`Failed to set time. message: ${error.message}, code: ${error.code}`);
      return;
    }
    console.info(`Succeeded in setting time`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to set time. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.setTime

setTime(time : number) : Promise<void>

Sets the system time. This API uses a promise to return the result.

System API: This is a system API.

System capability: SystemCapability.MiscServices.Time

Required permissions: ohos.permission.SET_TIME

Parameters

Name	Type	Mandatory	Description
time	number	Yes	Timestamp to set, in milliseconds.

Return value

Type	Description
Promise<void>	Promise that returns no value.

Example

import { BusinessError } from '@ohos.base';

// Set the system time to 2021-01-20 02:36:25.
let time = 1611081385000;
try {
  systemDateTime.setTime(time).then(() => {
    console.info(`Succeeded in setting time.`);
  }).catch((error: BusinessError) => {
    console.info(`Failed to set time. message: ${error.message}, code: ${error.code}`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to set time. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getCurrentTime

getCurrentTime(isNano: boolean, callback: AsyncCallback<number>): void

Obtains the time elapsed since the Unix epoch. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.MiscServices.Time

Parameters

Name	Type	Mandatory	Description
isNano	boolean	Yes	Whether the time to return is in nanoseconds. - true: The time to return is in nanoseconds. - false: The time to return is in milliseconds.
callback	AsyncCallback<number>	Yes	Callback used to return the time elapsed since the Unix epoch.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.getCurrentTime(true, (error: BusinessError, time: number) => {
    if (error) {
      console.info(`Failed to get currentTime. message: ${error.message}, code: ${error.code}`);
      return;
    }
    console.info(`Succeeded in getting currentTime : ${time}`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get currentTime. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getCurrentTime

getCurrentTime(callback: AsyncCallback<number>): void

Obtains the time elapsed since the Unix epoch. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.MiscServices.Time

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<number>	Yes	Callback used to return the time elapsed since the Unix epoch, in milliseconds.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.getCurrentTime((error: BusinessError, time: number) => {
    if (error) {
      console.info(`Failed to get currentTime. message: ${error.message}, code: ${error.code}`);
      return;
    }
    console.info(`Succeeded in getting currentTime : ${time}`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get currentTime. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getCurrentTime

getCurrentTime(isNano?: boolean): Promise<number>

Obtains the time elapsed since the Unix epoch. This API uses a promise to return the result.

System capability: SystemCapability.MiscServices.Time

Parameters

Name	Type	Mandatory	Description
isNano	boolean	No	Whether the time to return is in nanoseconds. The default value is false. - true: The time to return is in nanoseconds. - false: The time to return is in milliseconds.

Return value

Type	Description
Promise<number>	Promise used to return the time elapsed since the Unix epoch.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.getCurrentTime().then((time: number) => {
    console.info(`Succeeded in getting currentTime : ${time}`);
  }).catch((error: BusinessError) => {
    console.info(`Failed to get currentTime. message: ${error.message}, code: ${error.code}`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get currentTime. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getRealActiveTime

getRealActiveTime(isNano: boolean, callback: AsyncCallback<number>): void

Obtains the time elapsed since system startup, excluding the deep sleep time. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.MiscServices.Time

Parameters

Name	Type	Mandatory	Description
isNano	boolean	Yes	Whether the time to return is in nanoseconds. - true: The time to return is in nanoseconds. - false: The time to return is in milliseconds.
callback	AsyncCallback<number>	Yes	Callback used to return the time.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.getRealActiveTime(true, (error: BusinessError, time: number) => {
    if (error) {
      console.info(`Failed to get real active time. message: ${error.message}, code: ${error.code}`);
      return;
    }
    console.info(`Succeeded in getting real active time : ${time}`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get real active time. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getRealActiveTime

getRealActiveTime(callback: AsyncCallback<number>): void

Obtains the time elapsed since system startup, excluding the deep sleep time. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.MiscServices.Time

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<number>	Yes	Callback used to return the time.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.getRealActiveTime((error: BusinessError, time: number) => {
    if (error) {
      console.info(`Failed to get real active time. message: ${error.message}, code: ${error.code}`);
      return;
    }
    console.info(`Succeeded in getting real active time : ${time}`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get real active time. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getRealActiveTime

getRealActiveTime(isNano?: boolean): Promise<number>

Obtains the time elapsed since system startup, excluding the deep sleep time. This API uses a promise to return the result.

System capability: SystemCapability.MiscServices.Time

Parameters

Name	Type	Mandatory	Description
isNano	boolean	No	Whether the time to return is in nanoseconds. The default value is false. - true: The time to return is in nanoseconds. - false: The time to return is in milliseconds.

Return value

Type	Description
Promise<number>	Promise used to return the time elapsed since system startup, excluding the deep sleep time.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.getRealActiveTime().then((time: number) => {
    console.info(`Succeeded in getting real active time : ${time}`);
  }).catch((error: BusinessError) => {
    console.info(`Failed to get real active time. message: ${error.message}, code: ${error.code}`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get real active time. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getRealTime

getRealTime(isNano: boolean, callback: AsyncCallback<number>): void

Obtains the time elapsed since system startup, including the deep sleep time. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.MiscServices.Time

Parameters

Name	Type	Mandatory	Description
isNano	boolean	Yes	Whether the time to return is in nanoseconds. - true: The time to return is in nanoseconds. - false: The time to return is in milliseconds.
callback	AsyncCallback<number>	Yes	Callback used to return the time.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.getRealTime(true, (error: BusinessError, time: number) => {
    if (error) {
      console.info(`Failed to get real time. message: ${error.message}, code: ${error.code}`);
      return;
    }
    console.info(`Succeeded in getting real time : ${time}`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get real time. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getRealTime

getRealTime(callback: AsyncCallback<number>): void

Obtains the time elapsed since system startup, including the deep sleep time. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.MiscServices.Time

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<number>	Yes	Callback used to return the time.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.getRealTime((error: BusinessError, time: number) => {
    if (error) {
      console.info(`Failed to get real time. message: ${error.message}, code: ${error.code}`);
      return;
    }
    console.info(`Succeeded in getting real time : ${time}`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get real time. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getRealTime

getRealTime(isNano?: boolean): Promise<number>

Obtains the time elapsed since system startup, including the deep sleep time. This API uses a promise to return the result.

System capability: SystemCapability.MiscServices.Time

Parameters

Name	Type	Mandatory	Description
isNano	boolean	No	Whether the time to return is in nanoseconds. The default value is false. - true: The time to return is in nanoseconds. - false: The time to return is in milliseconds.

Return value

Type	Description
Promise<number>	Promise used to return the time elapsed since system startup, including the deep sleep time.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.getRealTime().then((time: number) => {
    console.info(`Succeeded in getting real time : ${time}`);
  }).catch((error: BusinessError) => {
    console.info(`Failed to get real time. message: ${error.message}, code: ${error.code}`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get real time. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getTime¹⁰⁺

getTime(isNanoseconds?: boolean): number

Obtains the time elapsed since the Unix epoch. This API returns the result synchronously.

System capability: SystemCapability.MiscServices.Time

Parameters

Name	Type	Mandatory	Description
isNanoseconds	boolean	No	Whether the time to return is in nanoseconds. - true: The time to return is in nanoseconds. - false: The time to return is in milliseconds. Default value: false

Return value

Type	Description
number	Time elapsed since the Unix epoch.

Example

try {
  let time = systemDateTime.getTime(true)
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get time. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getUptime¹⁰⁺

getUptime(timeType: TimeType, isNanoseconds?: boolean): number

Obtains the time elapsed since system startup. This API returns the result synchronously.

System capability: SystemCapability.MiscServices.Time

Parameters

Name	Type	Mandatory	Description
timeType	TimeType	Yes	Type of the time to obtain.
isNanoseconds	boolean	No	Whether the time to return is in nanoseconds. - true: The time to return is in nanoseconds. - false: The time to return is in milliseconds. Default value: false

Return value

Type	Description
number	Time elapsed since system startup.

Example

try {
  let time = systemDateTime.getUptime(systemDateTime.TimeType.ACTIVE, false);
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get uptime. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.setDate^(deprecated)

setDate(date: Date, callback: AsyncCallback<void>): void

Sets the system date. This API uses an asynchronous callback to return the result.

NOTE

This API is supported since API version 9 and deprecated since API version 10. You are advised to use systemDateTime.setTime instead.

System API: This is a system API.

System capability: SystemCapability.MiscServices.Time

Required permissions: ohos.permission.SET_TIME

Parameters

Name	Type	Mandatory	Description
date	Date	Yes	Target date to set.
callback	AsyncCallback<void>	Yes	Callback used to return the result.

Example

import { BusinessError } from '@ohos.base';

let date = new Date();
try {
  systemDateTime.setDate(date, (error: BusinessError) => {
    if (error) {
      console.info(`Failed to set date. message: ${error.message}, code: ${error.code}`);
      return;
    }
    console.info(`Succeeded in setting date.`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to set date. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.setDate^(deprecated)

setDate(date: Date): Promise<void>

Sets the system date. This API uses a promise to return the result.

NOTE

This API is supported since API version 9 and deprecated since API version 10. You are advised to use systemDateTime.setTime instead.

System API: This is a system API.

System capability: SystemCapability.MiscServices.Time

Required permissions: ohos.permission.SET_TIME

Parameters

Name	Type	Mandatory	Description
date	Date	Yes	Target date to set.

Return value

Type	Description
Promise<void>	Promise that returns no value.

Example

import { BusinessError } from '@ohos.base';

let date = new Date(); 
try {
  systemDateTime.setDate(date).then(() => {
    console.info(`Succeeded in setting date.`);
  }).catch((error: BusinessError) => {
    console.info(`Failed to set date. message: ${error.message}, code: ${error.code}`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to set date. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getDate^(deprecated)

getDate(callback: AsyncCallback<Date>): void

Obtains the current system date. This API uses an asynchronous callback to return the result.

NOTE

This API is supported since API version 9 and deprecated since API version 10. You are advised to use new Date() instead, which returns a Date object.

System capability: SystemCapability.MiscServices.Time

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<Date>	Yes	Callback used to return the current system date.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.getDate((error: BusinessError, date: Date) => {
    if (error) {
      console.info(`Failed to get date. message: ${error.message}, code: ${error.code}`);
      return;
    }
    console.info(`Succeeded in getting date : ${date}`);;
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get date. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getDate^(deprecated)

getDate(): Promise<Date>

Obtains the current system date. This API uses a promise to return the result.

NOTE

This API is supported since API version 9 and deprecated since API version 10. You are advised to use new Date() instead, which returns a Date object.

System capability: SystemCapability.MiscServices.Time

Return value

Type	Description
Promise<Date>	Promise used to return the current system date.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.getDate().then((date: Date) => {
    console.info(`Succeeded in getting date : ${date}`);
  }).catch((error: BusinessError) => {
    console.info(`Failed to get date. message: ${error.message}, code: ${error.code}`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get date. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.setTimezone

setTimezone(timezone: string, callback: AsyncCallback<void>): void

Sets the system time zone. This API uses an asynchronous callback to return the result.

System API: This is a system API.

System capability: SystemCapability.MiscServices.Time

Required permissions: ohos.permission.SET_TIME_ZONE

Parameters

Name	Type	Mandatory	Description
timezone	string	Yes	System time zone to set. For details, see Supported System Time Zones.
callback	AsyncCallback<void>	Yes	Callback used to return the result.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.setTimezone('Asia/Shanghai', (error: BusinessError) => {
    if (error) {
      console.info(`Failed to set timezone. message: ${error.message}, code: ${error.code}`);
      return;
    }
    console.info(`Succeeded in setting timezone.`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to set timezone. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.setTimezone

setTimezone(timezone: string): Promise<void>

Sets the system time zone. This API uses a promise to return the result.

System API: This is a system API.

System capability: SystemCapability.MiscServices.Time

Required permissions: ohos.permission.SET_TIME_ZONE

Parameters

Name	Type	Mandatory	Description
timezone	string	Yes	System time zone to set. For details, see Supported System Time Zones.

Return value

Type	Description
Promise<void>	Promise that returns no value.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.setTimezone('Asia/Shanghai').then(() => {
    console.info(`Succeeded in setting timezone.`);
  }).catch((error: BusinessError) => {
    console.info(`Failed to set timezone. message: ${error.message}, code: ${error.code}`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to set timezone. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getTimezone

getTimezone(callback: AsyncCallback<string>): void

Obtains the system time zone. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.MiscServices.Time

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<string>	Yes	Callback used to return the system time zone. For details, see Supported System Time Zones.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.getTimezone((error: BusinessError, data: string) => {
    if (error) {
      console.info(`Failed to get timezone. message: ${error.message}, code: ${error.code}`);
      return;
    }
    console.info(`Succeeded in get timezone : ${data}`);;
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get timezone. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getTimezone

getTimezone(): Promise<string>

Obtains the system time zone. This API uses a promise to return the result.

System capability: SystemCapability.MiscServices.Time

Return value

Type	Description
Promise<string>	Promise used to return the system time zone. For details, see Supported System Time Zones.

Example

import { BusinessError } from '@ohos.base';

try {
  systemDateTime.getTimezone().then((data: string) => {
    console.info(`Succeeded in getting timezone: ${data}`);
  }).catch((error: BusinessError) => {
    console.info(`Failed to get timezone. message: ${error.message}, code: ${error.code}`);
  });
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get timezone. message: ${error.message}, code: ${error.code}`);
}

systemDateTime.getTimezoneSync¹⁰⁺

getTimezoneSync(): string

Obtain the system time zone. This API returns the result synchronously.

System capability: SystemCapability.MiscServices.Time

Return value

Type	Description
string	System time zone. For details, see Supported System Time Zones.

Example

try {
  let timezone = systemDateTime.getTimezoneSync();
} catch(e) {
  let error = e as BusinessError;
  console.info(`Failed to get timezone. message: ${error.message}, code: ${error.code}`);
}

Supported System Time Zones

The following table lists the supported system time zones and the respective offset (unit: h) between each time zone and time zone 0.

Time Zone	Offset
Antarctica/McMurdo	12
America/Argentina/Buenos_Aires	-3
Australia/Sydney	10
America/Noronha	-2
America/St_Johns	-3
Africa/Kinshasa	1
America/Santiago	-3
Asia/Shanghai	8
Asia/Nicosia	3
Europe/Berlin	2
America/Guayaquil	-5
Europe/Madrid	2
Pacific/Pohnpei	11
America/Godthab	-2
Asia/Jakarta	7
Pacific/Tarawa	12
Asia/Almaty	6
Pacific/Majuro	12
Asia/Ulaanbaatar	8
America/Mexico_City	-5
Asia/Kuala_Lumpur	8
Pacific/Auckland	12
Pacific/Tahiti	-10
Pacific/Port_Moresby	10
Asia/Gaza	3
Europe/Lisbon	1
Europe/Moscow	3
Europe/Kiev	3
Pacific/Wake	12
America/New_York	-4
Asia/Tashkent	5

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harmony 鸿蒙@ohos.systemDateTime (System Time and Time Zone)

@ohos.systemDateTime (System Time and Time Zone)

Modules to Import

TimeType¹⁰⁺

systemDateTime.setTime

systemDateTime.setTime

systemDateTime.getCurrentTime

systemDateTime.getCurrentTime

systemDateTime.getCurrentTime

systemDateTime.getRealActiveTime

systemDateTime.getRealActiveTime

systemDateTime.getRealActiveTime

systemDateTime.getRealTime

systemDateTime.getRealTime

systemDateTime.getRealTime

systemDateTime.getTime¹⁰⁺

systemDateTime.getUptime¹⁰⁺

systemDateTime.setDate^(deprecated)

systemDateTime.setDate^(deprecated)

systemDateTime.getDate^(deprecated)

systemDateTime.getDate^(deprecated)

systemDateTime.setTimezone

systemDateTime.setTimezone

systemDateTime.getTimezone

systemDateTime.getTimezone

systemDateTime.getTimezoneSync¹⁰⁺

Supported System Time Zones

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harmony 鸿蒙@ohos.systemDateTime (System Time and Time Zone)

@ohos.systemDateTime (System Time and Time Zone)

Modules to Import

TimeType10+

systemDateTime.setTime

systemDateTime.setTime

systemDateTime.getCurrentTime

systemDateTime.getCurrentTime

systemDateTime.getCurrentTime

systemDateTime.getRealActiveTime

systemDateTime.getRealActiveTime

systemDateTime.getRealActiveTime

systemDateTime.getRealTime

systemDateTime.getRealTime

systemDateTime.getRealTime

systemDateTime.getTime10+

systemDateTime.getUptime10+

systemDateTime.setDate(deprecated)

systemDateTime.setDate(deprecated)

systemDateTime.getDate(deprecated)

systemDateTime.getDate(deprecated)

systemDateTime.setTimezone

systemDateTime.setTimezone

systemDateTime.getTimezone

systemDateTime.getTimezone

systemDateTime.getTimezoneSync10+

Supported System Time Zones

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本文目录

TimeType¹⁰⁺

systemDateTime.getTime¹⁰⁺

systemDateTime.getUptime¹⁰⁺

systemDateTime.setDate^(deprecated)

systemDateTime.setDate^(deprecated)

systemDateTime.getDate^(deprecated)

systemDateTime.getDate^(deprecated)

systemDateTime.getTimezoneSync¹⁰⁺