Definitions of "last_" times from Google reports

	A	B	C	D
1	Parameter	Official name	Explanation	Documentation page

2	accounts:last_login_time	timestamp_last_login	The time when the user last logged into the user's account. The date is in the RFC 3339 format, for example 2010-10-28T10:26:35.000Z.	https://developers.google.com/admin-sdk/reports/v1/appendix/usage/user/accounts
3	accounts:last_sso_time	timestamp_last_sso	The time when the user last logged into the user's account using Single Sign-On (SSO). The date is in the RFC 3339 format, for example 2010-10-28T10:26:35.000Z.	https://developers.google.com/admin-sdk/reports/v1/appendix/usage/user/accounts
4	drive:last_active_usage_time	timestamp_last_active_usage	Indicates the user's last active Google Drive use.	https://developers.google.com/admin-sdk/reports/v1/appendix/usage/user/drive
5	gmail:last_access_time	timestamp_last_access	The time of the most recent access to the user's account within last 30 days. This can be triggered by non-user events requiring access, such as receiving mail.	https://developers.google.com/admin-sdk/reports/v1/appendix/usage/user/gmail
6	gmail:last_imap_time	timestamp_last_imap	The time of user's most recent IMAP interaction within last 30 days.	https://developers.google.com/admin-sdk/reports/v1/appendix/usage/user/gmail
7	gmail:last_interaction_time	timestamp_last_interaction	The time of the user's most recent interaction within last 30 days.	https://developers.google.com/admin-sdk/reports/v1/appendix/usage/user/gmail
8	gmail:last_webmail_time	timestamp_last_webmail	The time of user's most recent interaction from web Gmail within last 30 days.	https://developers.google.com/admin-sdk/reports/v1/appendix/usage/user/gmail
9	gmail:last_pop_time	timestamp_last_pop	The time of user's most recent POP interaction within last 30 days.	https://developers.google.com/admin-sdk/reports/v1/appendix/usage/user/gmail
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