You can use CSV importer (bundled with JIRA) to import worklog from Excel (which you need to save first into CSV format) directly to JIRA.
This procedure is documented at https://confluence.atlassian.com/display/JIRA/Importing+Data+from+CSV (see Importing Worklog section).
Hope this information helps!
As a Belgian, beer-lover and home brewer, beer is one of my great passions. I love the fact that with just a few ingredients (usually just water, hop and malt) you can create so many different tastes...
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