Bug: `$AWS.SDK` method types return `Date` in step functions

[thantos]

$AWS.SDK method types return Date in step functions, but are actually a string.

DescribeStacks

"CreationTime": "2013-08-23T01:02:15.422Z",

$AWS.SDK.CloudFormation.describeStacks

export type CreationTime = Date;
    /**
     * The time at which the stack was created.
     */
    CreationTime: CreationTime;
  

[sam-goodwin]

What do the step function isTimestsmp Intrinsics do? Check the string against a regex? Can they be used or do we need to change the types?

[thantos]

They can check if the string is a valid timestamp and compare (>, <, etc) between timestamps, but they cannot do timestamp math or work with non-iso timestamps or timezones.