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A full list of JavaScript operators with examples
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Free online time interval calculator. Calculate time differences between two dates and times with timezone support.

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Based on our record, JavaScript Operator Lookup seems to be more popular. It has been mentioned 1 time since March 2021.
Website, pricing, platforms and company facts side by side.
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Time-Interval.com
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| Website | joshwcomeau.com | time-interval.com |
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Recommendations tracked on public social media and blogs since March 2021.

If you replace your || with ?? You should get the behaviour you are after. This is a good reference for what the operators do in js: https://joshwcomeau.com/operator-lookup. Source: about 5 years ago
Tracking Time-Interval.com since Jul 2025.
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