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55 lines (46 loc) · 1.37 KB
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interface Utc
exposes [
Utc,
now,
toMillisSinceEpoch,
fromMillisSinceEpoch,
toNanosSinceEpoch,
fromNanosSinceEpoch,
deltaAsMillis,
deltaAsNanos,
]
imports [Effect, InternalTask, Task.{ Task }]
## Stores a timestamp as nanoseconds since UNIX EPOCH
Utc := U128
## Duration since UNIX EPOCH
now : Task Utc *
now =
Effect.posixTime
|> Effect.map @Utc
|> Effect.map Ok
|> InternalTask.fromEffect
# Constant number of nanoseconds in a millisecond
nanosPerMilli = 1_000_000
## Convert Utc timestamp to milliseconds
toMillisSinceEpoch : Utc -> U128
toMillisSinceEpoch = \@Utc nanos ->
nanos * nanosPerMilli
## Convert milliseconds to Utc timestamp
fromMillisSinceEpoch : U128 -> Utc
fromMillisSinceEpoch = \millis ->
@Utc (millis * nanosPerMilli)
## Convert Utc timestamp to nanoseconds
toNanosSinceEpoch : Utc -> U128
toNanosSinceEpoch = \@Utc nanos ->
nanos
## Convert nanoseconds to Utc timestamp
fromNanosSinceEpoch : U128 -> Utc
fromNanosSinceEpoch = @Utc
## Calculate milliseconds between two Utc timestamps
deltaAsMillis : Utc, Utc -> U128
deltaAsMillis = \@Utc first, @Utc second ->
(Num.absDiff first second) // nanosPerMilli
## Calculate nanoseconds between two Utc timestamps
deltaAsNanos : Utc, Utc -> U128
deltaAsNanos = \@Utc first, @Utc second ->
Num.absDiff first second