questions

What are IFRS?
Where can I obtain the original IFRS documents?
Which entities need to apply IFRS?
For how long have these standards been effective?
Do I use cost or valuation as the basis for carry fixed assets?
If I use the revaluation model, what is the accounting treatment of 'accumulated depreciation prior to revaluation'?
How should depreciation be provided under IAS 16?
How do I account for impairment of assets?
Where do I show impairment losses?
How do I treat impairment of cash generating units?
Can I reverse impairment losses?
Can I reverse an impairment loss for goodwill?
What is goodwill and how should it be presented in the financial statements?
How does this compare with impairment of financial assets?

For how long have these standards been effective?

Generally they have been effective at least since 2000, albeit sometimes in an earlier version. Each standard contains detailed information as to the date of applicability and this should be consulted.