| What it does | Time duration calculator for hours, minutes, and dates
| Weekly propane and heating oil prices by state with free home heating cost calculators
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| Stage | Not given
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| Founded | Not given
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| Pricing model | Free
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| Pricing | Not given
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| Key features | - Calculate elapsed time between two times or dates
- Handle shifts that cross midnight
- Support for multiple time formats: h:mm:ss, decimal hours, and total minutes
- Account for daylight saving time with timezone selection
- Add up to 20 time spans together
- Run calculations in browser with no data storage
- Pre-calculated common work shifts for reference
- Calculate hours worked with unpaid break deductions
- Show results in multiple formats for different use cases
| - Weekly EIA residential propane prices for 38 states
- Regional and state price trends
- Tank fill cost estimates for common tank sizes
- Year-over-year price comparison
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| What makes it different | - All calculations verified against 100+ automated tests before each release
- Handles edge cases like midnight crossings, month-end dates, and daylight saving
- Built by a single developer who personally checks every result
- No server storage or tracking of user inputs
- Comprehensive methodology page explains all calculation rules
| - Built from public government data with every price dated and linked to its source
- No sign-up required, everything is free
- Independent tool not affiliated with fuel dealers or utilities
- Calculators use actual government prices and normal weather for accurate estimates
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 1 | 0 |
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| Citation Flow (Majestic) | 18 | 0 |
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| Referring domains (Majestic) | 2 | 0 |
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Timespanly