How can I track the time (official records) I spend outside the UK?

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Since there is no passport control while exiting the UK (e.g. via Heathrow), I have stamps on my passport for entries only. During the entry, passport officers ask me how long I have been outside the UK and I tell them.
I wonder how to track what is officially recorded. Is there a way?
Note: I'm a non-EEA citizen.
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Can I get a record of my travel history UK?
You can request a copy of: an electronic summary of your immigration history. landing cards we hold electronically. visa applications you submitted from outside of the UK (as part of entry clearance)Can I check my travel history?
Students may view their U.S. travel history online through the U.S. Customs and Border Patrol Website (https://i94.cbp.dhs.gov/I94). (Please note that the travel history is different from the I-94 record used to provide proof of legal entry to the U.S.)Does UK Immigration know when you leave?
Contents. The coalition government committed in 2010 to reintroducing exit checks. From 8 April 2015, we will collect information on passengers leaving the UK as we do for those entering. Exit checks will provide us with vital information that confirms a person's exit from the UK.How long are UK visa records kept?
They keep them permanently on record, although in most cases an exclusion order for the UK for immigration offences is usually 3 years. After 3 years you can re-apply, but the circumstances of the previous exclusion order will heavily affect any new decision.Out Of Time
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