FQL v4 will be decommissioned on June 30, 2025. Ensure that you complete your migration from FQL v4 to FQL v10 by that date.

For more details, review the migration guide. Contact support@fauna.com with any questions.

TimeSubtract

This reference topic applies to FQL v4. Go to this page for the latest FQL v10 reference topics.

 
TimeSubtract( base, offset, unit )
time_subtract( base, offset, unit )
TimeSubtract( base, offset, unit )
TimeSubtract( base, offset, unit )
TimeSubtract( base, offset, unit )

Description

The TimeSubtract function decreases a base Timestamp or Date by subtracting the offset in units.

Parameters

Parameter Type Definition and Requirements

base

Timestamp or Date

A Timestamp or Date to subtract from. base must match the type of unit.

offset

Integer or Long

The integer number of units to subtract from base.

unit

String

Unit of the offset.

When base is a Date, unit must be one of day or days.

When base is a Timestamp, unit must be one of:

  • day, or days

  • half day, or half days

  • hour, or hours

  • minute, or minutes

  • second, or seconds

  • millisecond, or milliseconds

  • microsecond, or microseconds

  • nanosecond, or nanoseconds

Returns

When base is a Date, a new Date which represents base with offset units subtracted from it.

When base is a Timestamp, a new Timestamp which represents base with offset units subtracted from it.

Examples

The following query subtracts 1 second from 1 day after Unix epoch:

client.query(
  q.TimeSubtract(q.Epoch(1, 'day'), 1, 'second')
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))
Time("1970-01-01T23:59:59Z")
result = client.query(
  q.time_subtract(q.epoch(1, "day"), 1, "second")
)
print(result)
FaunaTime('1970-01-01T23:59:59Z')
result, err := client.Query(
	f.TimeSubtract(f.Epoch(1, "day"), 1, "second"))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}
{0 62135683199 <nil>}
try
{
    Value result = await client.Query(
        TimeSubtract(Epoch(1, "day"), 1, "second")
    );

    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}
FaunaTime(1970-01-01T23:59:59Z)
TimeSubtract(Epoch(1, 'day'), 1, 'second')
Time("1970-01-01T23:59:59Z")
Query metrics:

  •    bytesIn:  69

  •   bytesOut:  43

  • computeOps:   1

  •    readOps:   0

  •   writeOps:   0

  •  readBytes:   0

  • writeBytes:   0

  •  queryTime: 4ms

  •    retries:   0

The following query returns a Timestamp 5 seconds in the past before now:

client.query([
  q.Now(),
  q.TimeSubtract(q.Now(), 5, 'seconds'),
])
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))
[ Time("2019-10-22T16:45:19.755048Z"),
  Time("2019-10-22T16:45:14.755048Z") ]
result = client.query(
  [
    q.now(),
    q.time_subtract(q.now(), 5, "seconds"),
  ]
)
print(result)
[FaunaTime('2021-01-18T21:47:21.114Z'), FaunaTime('2021-01-18T21:47:16.114Z')]
result, err := client.Query(
	f.Arr{
		f.Now(),
		f.TimeSubtract(f.Now(), 5, "seconds"),
	})

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}
[{879000000 63746603234 <nil>} {879000000 63746603229 <nil>}]
try
{
    Value result = await client.Query(
        Arr(
            Now(),
            TimeSubtract(Now(), 5, "seconds")
        )
    );

    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}
Arr(FaunaTime(2019-10-22T16:45:13.988Z), FaunaTime(2019-10-22T16:45:08.988Z))
[
  Now(),
  TimeSubtract(Now(), 5, 'seconds')
]
[ Time("2021-06-23T12:24:16.798Z"), Time("2021-06-23T12:24:11.798Z") ]
Query metrics:

  •    bytesIn:  73

  •   bytesOut:  84

  • computeOps:   1

  •    readOps:   0

  •   writeOps:   0

  •  readBytes:   0

  • writeBytes:   0

  •  queryTime: 5ms

  •    retries:   0

The following query returns a Date 1 day before 2019-11-26:

client.query(
  q.TimeSubtract(q.Date('2019-11-26'), 1, 'day')
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))
Date("2019-11-25")
result = client.query(
  q.time_subtract(q.date("2019-11-26"), 1, "day")
)
print(result)
2019-11-25
result, err := client.Query(
	f.TimeSubtract(f.Date("2019-11-26"), 1, "day"))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}
{0 63710236800 <nil>}
try
{
    Value result = await client.Query(
        TimeSubtract(Date("2019-11-26"), 1, "day")
    );

    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}
FaunaDate(2019-11-25 12:00:00 AM)
TimeSubtract(Date('2019-11-26'), 1, 'day')
Date("2019-11-25")
Query metrics:

  •    bytesIn:  63

  •   bytesOut:  35

  • computeOps:   1

  •    readOps:   0

  •   writeOps:   0

  •  readBytes:   0

  • writeBytes:   0

  •  queryTime: 4ms

  •    retries:   0

Is this article helpful? 

Tell Fauna how the article can be improved:
 Visit Fauna's forums or email docs@fauna.com

Thank you for your feedback!