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时间戳函数

名称	说明
`CURRENT_TIMESTAMP`	生成与请求时间对应的 `TIMESTAMP`。
`TIMESTAMP_TRUNC`	将 `TIMESTAMP` 按指定粒度进行截断。
`UNIX_MICROS_TO_TIMESTAMP`	将自 `1970-01-01 00:00:00 UTC` 以来的微秒数转换为 `TIMESTAMP`
`UNIX_MILLIS_TO_TIMESTAMP`	将自 `1970-01-01 00:00:00 UTC` 以来的毫秒数转换为 `TIMESTAMP`
`UNIX_SECONDS_TO_TIMESTAMP`	将自 `1970-01-01 00:00:00 UTC` 以来的秒数转换为 `TIMESTAMP`
`TIMESTAMP_ADD`	将时间间隔加到 `TIMESTAMP`
`TIMESTAMP_SUB`	从 `TIMESTAMP` 中减去一个时间间隔
`TIMESTAMP_TO_UNIX_MICROS`	将 `TIMESTAMP` 转换为自 `1970-01-01 00:00:00 UTC` 以来的微秒数
`TIMESTAMP_TO_UNIX_MILLIS`	将 `TIMESTAMP` 转换为自 `1970-01-01 00:00:00 UTC` 以来的毫秒数
`TIMESTAMP_TO_UNIX_SECONDS`	将 `TIMESTAMP` 转换为自 `1970-01-01 00:00:00 UTC` 以来的秒数

CURRENT_TIMESTAMP

语法：

current_timestamp() -> TIMESTAMP

说明：

获取请求时间 input 起始点的时间戳（该时间戳被解释为自 1970-01-01 00:00:00 UTC 以来经过的微秒数）。

此函数在单次查询中是稳定的，即多次调用将始终解析为同一个值。

TIMESTAMP_TRUNC

语法：

timestamp_trunc(timestamp: TIMESTAMP, granularity: STRING[, timezone: STRING]) -> TIMESTAMP

说明：

将时间戳按指定粒度向下取整。

granularity 实参必须为字符串，且必须是以下值之一：

microsecond
millisecond
second
minute
hour
day
week
week([weekday])
month
quarter
year
isoyear

如果提供了 timezone 参数，则截断将以指定时区的日历边界为准（例如，以指定时区的午夜作为一天的截断时间）。截断将遵循夏令时。

如果未提供 timezone，截断将以 UTC 日历边界为准。

timezone 实参应为 tz 数据库中某个时区的字符串表示法，例如 America/New_York。您还可以通过指定与 GMT 的偏移值来使用自定义时间偏移值。

示例：

`timestamp`	`granularity`	`timezone`	`timestamp_trunc(timestamp, granularity, timezone)`
2000-01-01 10:20:30:123456 UTC	"second"	未提供	2001-01-01 10:20:30 UTC
1997-05-31 04:30:30 UTC	"day"	未提供	1997-05-31 00:00:00 UTC
1997-05-31 04:30:30 UTC	"day"	"America/Los_Angeles"	1997-05-30 07:00:00 UTC
2001-03-16 04:00:00 UTC	"week(friday)	未提供	2001-03-16 00:00:00 UTC
2001-03-23 04:00:00 UTC	"week(friday)	"America/Los_Angeles"	2001-03-23 17:00:00 UTC
2026-01-24 20:00:00 UTC	"month"	"GMT+06:32:43"	2026-01-01T06:32:43 UTC

UNIX_MICROS_TO_TIMESTAMP

语法：

unix_micros_to_timestamp(input: INT64) -> TIMESTAMP

说明：

将 input（解释为自 1970-01-01 00:00:00 UTC 以来的微秒数）转换为 TIMESTAMP。如果 input 无法转换为有效的 TIMESTAMP，则会抛出 error。

示例：

`input`	`unix_micros_to_timestamp(input)`
0L	1970-01-01 00:00:00 UTC
400123456L	1970-01-01 00:06:40.123456 UTC
-1000000L	1969-12-31 23:59:59 UTC

Web

const result = await execute(db.pipeline()
  .collection("documents")
  .select(
    field("createdAtMicros").unixMicrosToTimestamp().as("createdAtString")
  )
);test.firestore.js

Swift

let result = try await db.pipeline()
  .collection("documents")
  .select([
    Field("createdAtMicros").unixMicrosToTimestamp().as("createdAtString")
  ])
  .execute()PipelineSnippets.swift

Kotlin

val result = db.pipeline()
    .collection("documents")
    .select(
        field("createdAtMicros").unixMicrosToTimestamp().alias("createdAtString")
    )
    .execute()DocSnippets.kt

Java

Task<Pipeline.Snapshot> result = db.pipeline()
    .collection("documents")
    .select(
        field("createdAtMicros").unixMicrosToTimestamp().alias("createdAtString")
    )
    .execute();DocSnippets.java

Python

from google.cloud.firestore_v1.pipeline_expressions import Field

result = (
    client.pipeline()
    .collection("documents")
    .select(
        Field.of("createdAtMicros")
        .unix_micros_to_timestamp()
        .as_("createdAtString")
    )
    .execute()
)firestore_pipelines.py

UNIX_MILLIS_TO_TIMESTAMP

语法：

unix_millis_to_timestamp(input: INT64) -> TIMESTAMP

说明：

将 input（解释为自 1970-01-01 00:00:00 UTC 以来的毫秒数）转换为 TIMESTAMP。如果 input 无法转换为有效的 TIMESTAMP，则会抛出 error。

示例：

`input`	`unix_millis_to_timestamp(input)`
0L	1970-01-01 00:00:00 UTC
4000123L	1970-01-01 01:06:40.123 UTC
-1000000L	1969-12-31 23:43:20 UTC

Web

const result = await execute(db.pipeline()
  .collection("documents")
  .select(
    field("createdAtMillis").unixMillisToTimestamp().as("createdAtString")
  )
);test.firestore.js

Swift

let result = try await db.pipeline()
  .collection("documents")
  .select([
    Field("createdAtMillis").unixMillisToTimestamp().as("createdAtString")
  ])
  .execute()PipelineSnippets.swift

Kotlin

val result = db.pipeline()
    .collection("documents")
    .select(
        field("createdAtMillis").unixMillisToTimestamp().alias("createdAtString")
    )
    .execute()DocSnippets.kt

Java

Task<Pipeline.Snapshot> result = db.pipeline()
    .collection("documents")
    .select(
        field("createdAtMillis").unixMillisToTimestamp().alias("createdAtString")
    )
    .execute();DocSnippets.java

Python

from google.cloud.firestore_v1.pipeline_expressions import Field

result = (
    client.pipeline()
    .collection("documents")
    .select(
        Field.of("createdAtMillis")
        .unix_millis_to_timestamp()
        .as_("createdAtString")
    )
    .execute()
)firestore_pipelines.py

UNIX_SECONDS_TO_TIMESTAMP

语法：

unix_seconds_to_timestamp(input: INT64) -> TIMESTAMP

说明：

将 input（解释为自 1970-01-01 00:00:00 UTC 以来的秒数）转换为 TIMESTAMP。如果 input 无法转换为有效的 TIMESTAMP，则会抛出 error。

示例：

`input`	`unix_seconds_to_timestamp(input)`
0L	1970-01-01 00:00:00 UTC
60L	1970-01-01 00:01:00 UTC
-300L	1969-12-31 23:55:00 UTC

Web

const result = await execute(db.pipeline()
  .collection("documents")
  .select(
    field("createdAtSeconds").unixSecondsToTimestamp().as("createdAtString")
  )
);test.firestore.js

Swift

let result = try await db.pipeline()
  .collection("documents")
  .select([
    Field("createdAtSeconds").unixSecondsToTimestamp().as("createdAtString")
  ])
  .execute()PipelineSnippets.swift

Kotlin

val result = db.pipeline()
    .collection("documents")
    .select(
        field("createdAtSeconds").unixSecondsToTimestamp().alias("createdAtString")
    )
    .execute()DocSnippets.kt

Java

Task<Pipeline.Snapshot> result = db.pipeline()
    .collection("documents")
    .select(
        field("createdAtSeconds").unixSecondsToTimestamp().alias("createdAtString")
    )
    .execute();DocSnippets.java

Python

from google.cloud.firestore_v1.pipeline_expressions import Field

result = (
    client.pipeline()
    .collection("documents")
    .select(
        Field.of("createdAtSeconds")
        .unix_seconds_to_timestamp()
        .as_("createdAtString")
    )
    .execute()
)firestore_pipelines.py

TIMESTAMP_ADD

语法：

timestamp_add(timestamp: TIMESTAMP, unit: STRING, amount: INT64) -> TIMESTAMP

说明：

将 amount unit 加到 timestamp。amount 实参可以为负值，在这种情况下，其效果等同于 TIMESTAMP_SUB。

unit 实参必须为字符串，且必须是以下值之一：

microsecond
millisecond
second
minute
hour
day

如果生成的时间戳超出 TIMESTAMP 范围，将抛出错误。

示例：

`timestamp`	`unit`	`amount`	`timestamp_add(timestamp, unit, amount)`
2025-02-20 00:00:00 UTC	"minute"	2L	2025-02-20 00:02:00 UTC
2025-02-20 00:00:00 UTC	"hour"	-4L	2025-02-19 20:00:00 UTC
2025-02-20 00:00:00 UTC	"day"	5L	2025-02-25 00:00:00 UTC

Web

const result = await execute(db.pipeline()
  .collection("documents")
  .select(
    field("createdAt").timestampAdd("day", 3653).as("expiresAt")
  )
);test.firestore.js

Swift

let result = try await db.pipeline()
  .collection("documents")
  .select([
    Field("createdAt").timestampAdd(3653, .day).as("expiresAt")
  ])
  .execute()PipelineSnippets.swift

Kotlin

val result = db.pipeline()
    .collection("documents")
    .select(
        field("createdAt")
          .timestampAdd("day", 3653)
          .alias("expiresAt")
    )
    .execute()DocSnippets.kt

Java

Task<Pipeline.Snapshot> result = db.pipeline()
    .collection("documents")
    .select(
        field("createdAt").timestampAdd("day", 3653).alias("expiresAt")
    )
    .execute();DocSnippets.java

Python

from google.cloud.firestore_v1.pipeline_expressions import Field

result = (
    client.pipeline()
    .collection("documents")
    .select(Field.of("createdAt").timestamp_add("day", 3653).as_("expiresAt"))
    .execute()
)firestore_pipelines.py

TIMESTAMP_SUB

语法：

timestamp_sub(timestamp: TIMESTAMP, unit: STRING, amount: INT64) -> TIMESTAMP

说明：

从 timestamp 减去 amount unit。amount 实参可以为负值，在这种情况下，其效果等同于 TIMESTAMP_ADD。

unit 实参必须为字符串，且必须是以下值之一：

microsecond
millisecond
second
minute
hour
day

如果生成的时间戳超出 TIMESTAMP 范围，将抛出错误。

示例：

`timestamp`	`unit`	`amount`	`timestamp_sub(timestamp, unit, amount)`
2026-07-04 00:00:00 UTC	"minute"	40L	2026-07-03 23:20:00 UTC
2026-07-04 00:00:00 UTC	"hour"	-24L	2026-07-05 00:00:00 UTC
2026-07-04 00:00:00 UTC	"day"	3L	2026-07-01 00:00:00 UTC

Web

const result = await execute(db.pipeline()
  .collection("documents")
  .select(
    field("expiresAt").timestampSubtract("day", 14).as("sendWarningTimestamp")
  )
);test.firestore.js

Swift

let result = try await db.pipeline()
  .collection("documents")
  .select([
    Field("expiresAt").timestampSubtract(14, .day).as("sendWarningTimestamp")
  ])
  .execute()PipelineSnippets.swift

Kotlin

val result = db.pipeline()
    .collection("documents")
    .select(
        field("expiresAt")
          .timestampSubtract("day", 14)
          .alias("sendWarningTimestamp")
    )
    .execute()DocSnippets.kt

Java

Task<Pipeline.Snapshot> result = db.pipeline()
    .collection("documents")
    .select(
        field("expiresAt").timestampSubtract("day", 14).alias("sendWarningTimestamp")
    )
    .execute();DocSnippets.java

Python

from google.cloud.firestore_v1.pipeline_expressions import Field

result = (
    client.pipeline()
    .collection("documents")
    .select(
        Field.of("expiresAt")
        .timestamp_subtract("day", 14)
        .as_("sendWarningTimestamp")
    )
    .execute()
)firestore_pipelines.py

TIMESTAMP_TO_UNIX_MICROS

语法：

timestamp_to_unix_micros(input: TIMESTAMP) -> INT64

说明：

将 input 转换为自 1970-01-01 00:00:00 UTC 以来的微秒数。通过向下舍入到微秒来截断更高的精度。

示例：

`input`	`timestamp_to_unix_micros(input)`
1970-01-01 00:00:00 UTC	0L
1970-01-01 00:06:40.123456 UTC	400123456L
1969-12-31 23:59:59 UTC	-1000000L

Web

const result = await execute(db.pipeline()
  .collection("documents")
  .select(
    field("dateString").timestampToUnixMicros().as("unixMicros")
  )
);test.firestore.js

Swift

let result = try await db.pipeline()
  .collection("documents")
  .select([
    Field("dateString").timestampToUnixMicros().as("unixMicros")
  ])
  .execute()PipelineSnippets.swift

Kotlin

val result = db.pipeline()
    .collection("documents")
    .select(
        field("dateString").timestampToUnixMicros().alias("unixMicros")
    )
    .execute()DocSnippets.kt

Java

Task<Pipeline.Snapshot> result = db.pipeline()
    .collection("documents")
    .select(
        field("dateString").timestampToUnixMicros().alias("unixMicros")
    )
    .execute();DocSnippets.java

Python

from google.cloud.firestore_v1.pipeline_expressions import Field

result = (
    client.pipeline()
    .collection("documents")
    .select(Field.of("dateString").timestamp_to_unix_micros().as_("unixMicros"))
    .execute()
)firestore_pipelines.py

TIMESTAMP_TO_UNIX_MILLIS

语法：

timestamp_to_unix_millis(input: TIMESTAMP) -> INT64

说明：

将 input 转换为自 1970-01-01 00:00:00 UTC 以来的毫秒数。通过向下舍入到毫秒来截断更高的精度。

示例：

`input`	`timestamp_to_unix_millis(input)`
1970-01-01 00:00:00 UTC	0L
1970-01-01 01:06:40.123 UTC	4000123L
1969-12-31 23:43:20	-1000000L

Web

const result = await execute(db.pipeline()
  .collection("documents")
  .select(
    field("dateString").timestampToUnixMillis().as("unixMillis")
  )
);test.firestore.js

Swift

let result = try await db.pipeline()
  .collection("documents")
  .select([
    Field("dateString").timestampToUnixMillis().as("unixMillis")
  ])
  .execute()PipelineSnippets.swift

Kotlin

val result = db.pipeline()
    .collection("documents")
    .select(
        field("dateString").timestampToUnixMillis().alias("unixMillis")
    )
    .execute()DocSnippets.kt

Java

Task<Pipeline.Snapshot> result = db.pipeline()
    .collection("documents")
    .select(
        field("dateString").timestampToUnixMillis().alias("unixMillis")
    )
    .execute();DocSnippets.java

Python

from google.cloud.firestore_v1.pipeline_expressions import Field

result = (
    client.pipeline()
    .collection("documents")
    .select(Field.of("dateString").timestamp_to_unix_millis().as_("unixMillis"))
    .execute()
)firestore_pipelines.py

TIMESTAMP_TO_UNIX_SECONDS

语法：

timestamp_to_unix_seconds(input: TIMESTAMP) -> INT64

说明：

将 input 转换为自 1970-01-01 00:00:00 UTC 以来的秒数。通过向下舍入到秒来截断更高的精度。

示例：

`input`	`timestamp_to_unix_seconds(input)`
1970-01-01 00:00:00 UTC	0L
1970-01-01 00:01:00 UTC	60L
1969-12-31 23:55:00 UTC	-300L

Web

const result = await execute(db.pipeline()
  .collection("documents")
  .select(
    field("dateString").timestampToUnixSeconds().as("unixSeconds")
  )
);test.firestore.js

Swift

let result = try await db.pipeline()
  .collection("documents")
  .select([
    Field("dateString").timestampToUnixSeconds().as("unixSeconds")
  ])
  .execute()PipelineSnippets.swift

Kotlin

val result = db.pipeline()
    .collection("documents")
    .select(
        field("dateString").timestampToUnixSeconds().alias("unixSeconds")
    )
    .execute()DocSnippets.kt

Java

Task<Pipeline.Snapshot> result = db.pipeline()
    .collection("documents")
    .select(
        field("dateString").timestampToUnixSeconds().alias("unixSeconds")
    )
    .execute();DocSnippets.java

Python

from google.cloud.firestore_v1.pipeline_expressions import Field

result = (
    client.pipeline()
    .collection("documents")
    .select(Field.of("dateString").timestamp_to_unix_seconds().as_("unixSeconds"))
    .execute()
)firestore_pipelines.py

时间戳函数 使用集合让一切井井有条 根据您的偏好保存内容并对其进行分类。