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FirebaseCore Framework Reference

FIRTimestamp


@interface FIRTimestamp : NSObject <NSCopying>

A Timestamp represents a point in time independent of any time zone or calendar, represented as seconds and fractions of seconds at nanosecond resolution in UTC Epoch time. It is encoded using the Proleptic Gregorian Calendar which extends the Gregorian calendar backwards to year one. It is encoded assuming all minutes are 60 seconds long, i.e. leap seconds are “smeared” so that no leap second table is needed for interpretation. Range is from 0001-01-01T00:00:00Z to 9999-12-31T23:59:59.999999999Z. By restricting to that range, we ensure that we can convert to and from RFC 3339 date strings.

See

https://github.com/google/protobuf/blob/main/src/google/protobuf/timestamp.proto for the reference timestamp definition.

  • Creates a new timestamp.

    Declaration

    Objective-C

    - (nonnull instancetype)initWithSeconds:(int64_t)seconds
                            nanoseconds:(int32_t)nanoseconds;

    Parameters

    seconds

    the number of seconds since epoch.
    nanoseconds

    the number of nanoseconds after the seconds.

  • Creates a new timestamp.

    Declaration

    Objective-C

    + (nonnull instancetype)timestampWithSeconds:(int64_t)seconds
                                 nanoseconds:(int32_t)nanoseconds;

    Parameters

    seconds

    the number of seconds since epoch.
    nanoseconds

    the number of nanoseconds after the seconds.

  • Creates a new timestamp from the given date.

    Declaration

    Objective-C

    + (nonnull instancetype)timestampWithDate:(nonnull NSDate *)date;

  • Creates a new timestamp with the current date / time.

    Declaration

    Objective-C

    + (nonnull instancetype)timestamp;

  • Returns a new Date corresponding to this timestamp. This may lose precision.

    Declaration

    Objective-C

    - (nonnull NSDate *)dateValue;

  • Returns the result of comparing the receiver with another timestamp.

    Declaration

    Objective-C

    - (NSComparisonResult)compare:(nonnull FIRTimestamp *)other;

    Parameters

    other

    the other timestamp to compare.

    Return Value

    orderedAscending if other is chronologically following self, orderedDescending if other is chronologically preceding self, orderedSame otherwise.

  • Represents seconds of UTC time since Unix epoch 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to 9999-12-31T23:59:59Z inclusive.

    Declaration

    Objective-C

    @property (nonatomic, readonly) int64_t seconds;

  • Non-negative fractions of a second at nanosecond resolution. Negative second values with fractions must still have non-negative nanos values that count forward in time. Must be from 0 to 999,999,999 inclusive.

    Declaration

    Objective-C

    @property (nonatomic, readonly) int32_t nanoseconds;