Site24x7 - Time periods and duration used for reporting

What are the different global time periods and their relevant duration used by Site24x7's reporting engine?

Site24x7 provides the following time periods for report generation:

Time period
Duration used for reporting
Last 1 Hour
From 60 minutes ago until the current time
Last 6 Hours
From 6 hours ago until the current time 
Last 12 Hours
From 12 hours ago until the current time
Last 24 Hours
From 24 hours ago until the current time
Today
From 12 am of the current calendar day until the current time

Yesterday
From 12 am of the previous calendar day until 12 am of the current calendar day
This Week (sun - yesterday)
For example, if the current day is Wednesday, data will be shown from 12 am of Sunday of the current calendar week until 12 am of the current calendar day (Wednesday) 
Last Week (sun - sat)
For example, if the current day is Wednesday, data will be shown from 12 am of Sunday of the previous calendar week until 12 am of Sunday of the current week
Last 7 days (till yesterday)
For example, if the current date is May 15 2018, data will be shown from 12 am of May 08 2018 until 12 am of the current day (May 15 2018) 
Last 30 days (till yesterday)
For example, if the current date is May 15 2018, data will be shown from 12 am of April 15 2018 until 12 am of the current day (May 15 2018).  
This Month (till yesterday)
For example, if the current month is May, data will be shown from 12 am of May 1st until 12 am of the current day.
Last Month
For example, if the current month is May, data will be shown from 12 am of April 1st until 12 am of May 1st.
Last Quarter
For example, if the current month is May, data will be shown from 12 am of January 1st until 12 am of April 1st.
This Quarter (till yesterday)
For example, if the current month is April, data will be shown from 12 am of April 1st until 12 am of the current day in the quarter.
Last 3 Months (till last month)
For example, if the current month is May, data will be shown from 12 am of February 1st until 12 am of May 1st. This will exclude the current month.
This Year (till yesterday)
For example, if the current year is April 2018, data will be shown from 12 am of January 1st 2018 until 12 am of the current day. 

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