The last update time of the document after applying the write. Not set after a delete.
If the write did not actually change the document, this will be the previous updateTime.
Uses RFC 3339, where generated output will always be Z-normalized and use 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: "2014-10-02T15:01:23Z", "2014-10-02T15:01:23.045123456Z" or "2014-10-02T15:01:23+05:30".
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-26 UTC."],[],[],null,["# WriteResult\n\nThe result of applying a write.\n\n| JSON representation |\n|--------------------------------------------------------------------------------|\n| ``` { \"updateTime\": string, \"transformResults\": [ { object (`Value`) } ] } ``` |\n\n| Fields ||\n|----------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `updateTime` | `string (`[Timestamp](https://protobuf.dev/reference/protobuf/google.protobuf/#timestamp)` format)` The last update time of the document after applying the write. Not set after a `delete`. If the write did not actually change the document, this will be the previous updateTime. Uses RFC 3339, where generated output will always be Z-normalized and uses 0, 3, 6 or 9 fractional digits. Offsets other than \"Z\" are also accepted. Examples: `\"2014-10-02T15:01:23Z\"`, `\"2014-10-02T15:01:23.045123456Z\"` or `\"2014-10-02T15:01:23+05:30\"`. |\n| `transformResults[]` | `object (``Value``)` The results of applying each [DocumentTransform.FieldTransform](/docs/firestore/reference/rest/v1beta1/Write#FieldTransform), in the same order. |"]]
