I'm using the newest version of the Android paid app, and have timestamps enabled.
If I multi-add, and view my diary on the website, only the most recent item in the multi-add has a timestamp. The other items do not.
Thanks for reporting this! We are aware of this issue and working on a resolution. The fix will hopefully be in the next mobile app update.
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This has been fixed in the latest release. You may need to manually download this from the app store. It will be listed as Cronometer 3.2.4 (463). Let me know if its not resolved for you!