ballerina/time2.1.0
Overview
This module provides a set of APIs that have the capabilities to generate and manipulate UTC and localized time.
In cloud computing, the most essential type of time is UTC. Coordinated Universal Time (UTC) is the primary time standard on which the world agreed.
UTC is independent of daylight saving time and provides a unique time value for the entire world.
The definition of UTC started from the epoc 1970-01-01T00:00:00Z. Initially, humans divided a day into 86400 seconds.
However, the Earth rotation does not adhere to this time duration as the Earth is slowing down and the day is getting longer.
As a result, a solar day in 2012 is longer than 86400 SI seconds.
To correct this incompatibility, additional seconds have been added to the UTC scale, which is known as leap-seconds.
The focus of this module is to give the most precise UTC with nanoseconds precision and also handle some complex use cases such as leap seconds and daylight time-saving.
UTC Time
The time:Utc is the tuple representation of the UTC. The UTC represents the number of seconds from a
specified epoch. Here, the epoch is the UNIX epoch of 1970-01-01T00:00:00Z.
Use the following API to get the current epoch time:
1time:Utc utc = time:utcNow();
Monotonic Time
The monotonic time represents the number of seconds from an unspecified epoch.
Use the following API to get the monotonic time from an unspecified topic:
1decimal seconds = time:monotonicNow();
Civil Time
The localized time represents using the time:Civil record. It includes the following details:
- date
- time
- timezone information
- daylight time-saving information
APIs
Parallel to the aforementioned time representations, this module includes a set of APIs to facilitate time conversions and manipulations using a set of high-level APIs. Those conversion APIs can be listed as follows.
The String Representations of UTC
1// Converts from RFC 3339 timestamp to UTC.2time:Utc utc = check time:utcFromString("2007-12-0310:15:30.00Z");34// Converts a given `time:Utc` time to a RFC 3339 timestamp.5string utcString = time:utcToString(utc);
The String Representations of Civil
1// Converts from RFC 3339 timestamp to a civil record.2time:Civil civil2 = check time:civilFromString("2007-12-03T10:15:30.00Z");34// Converts a given `time:Civil` time to a RFC 3339 timestamp.5string civilString = check time:civilToString(civil);
UTC Value Manipulation
1// Returns the UTC time that occurs seconds after the given UTC.2time:Utc utc = time:utcAddSeconds(time:utcNow(), 20.900);34// Returns the difference in seconds between two given UTC time values.5time:Utc utc1 = time:utcNow();6time:Utc utc2 = check time:utcFromString("2021-04-12T23:20:50.520Z");7time:Seconds seconds = time:utcDiffSeconds(utc1, utc2);
UTC vs Civil
1// Converts a given UTC to a Civil.2time:Civil civil = time:utcToCivil(utc);34// Converts a given Civil to a UTC.5time:Utc utc = time:utcFromCivil(civil);
Functions
[17]
| civilFromEmailString | Converts a given RFC 5322 formatted(e.g |
| civilFromString | Converts a given RFC 3339 timestamp(e.g. |
| civilToEmailString | Converts a given Civil record to RFC 5322 format(e.g |
| civilToString | Obtain a RFC 3339 timestamp(e.g. |
| dateValidate | Check that days and months are within range as per Gregorian calendar rules. |
| dayOfWeek | Get the day of week for a specified date. |
| getZone | Return the time zone object of a given zone ID. |
| loadSystemZone | Load the default time zone of the system. |
| monotonicNow | Returns no of seconds from unspecified epoch. |
| utcAddSeconds | Returns Utc time that occurs seconds after |
| utcDiffSeconds | Returns difference in seconds between utc1 and utc2. |
| utcFromCivil | Converts a given |
| utcFromString | Converts from RFC 3339 timestamp(e.g. |
| utcNow | Returns the UTC representing the current time (current instant of the system clock in seconds from the epoch of 1970-01-01T00:00:00). |
| utcToCivil | Converts a given |
| utcToEmailString | Converts a given UTC to an email formatted string(e.g |
| utcToString | Converts a given |
Classes
[1]
| TimeZone | Localized time zone implementation to handle time zones. |
Object types
[1]
| Zone | Abstract object representation to handle time zones. |
Records
[4]
| Civil | Time within some region relative to a time scale stipulated by civilian authorities. |
| Date | Date in proleptic Gregorian calendar. |
| TimeOfDay | Time within a day Not always duration from midnight. |
| ZoneOffset | This is closed so it is a subtype of Delta Fields can negative if any of the three fields are > 0, then all must be >= 0 if any of the three fields are < 0, then all must be <= 0 Semantic is that durations should be left out |
Constants
[7]
| FRIDAY | Friday represents from integer 5. |
| MONDAY | Monday represents from integer 1. |
| SATURDAY | Saturday represents from integer 6. |
| SUNDAY | Represents Sunday from integer 0. |
| THURSDAY | Thursday represents from integer 4. |
| TUESDAY | Tuesday represents from integer 2. |
| WEDNESDAY | Wednesday represents from integer 3. |
Enums
[1]
| HeaderZoneHandling | Indicate how to handle both |
Types
[5]
| DayOfWeek | The day of week according to the US convention. |
| Seconds | Holds the seconds as a decimal value. |
| Utc | Point on UTC time-scale. |
| UtcZoneHandling | Defualt zone value represation in different formats. |
| ZERO_OR_ONE | Represents the type that can be either zero or one. |
Variables
[1]
| Z | Represents the |
Errors
[2]
| Error | The generic module level error. |
| FormatError | The error to be returned when arguments are invalid. |