nanakshahi-ical
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Nanakshahi calendar iCal generator using official SGPC Jantri data with enhanced accuracy for Sikh religious observances.
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{
"metadata": {
"version": "1.0.0",
"description": "Calendar corrections database using SGPC Jantri data",
"lastUpdated": "2024-12-19",
"maintainer": "Janpreet Singh (not affiliated with SGPC)",
"contributors": [
"nanakshahi-ical contributors"
],
"sources": [
"SGPC Jantri publications (https://sgpc.net)",
"Community verification",
"Historical analysis"
]
},
"sgpcCorrections": {
"556": {
"gregorianYear": 2024,
"monthLengths": [
31,
31,
31,
31,
31,
30,
30,
30,
30,
30,
30,
30
],
"totalDays": 365,
"source": "SGPC official calendar 2024",
"validatedBy": "community",
"corrections": {
"july_5": "miri_piri_divas"
}
},
"557": {
"gregorianYear": 2025,
"monthLengths": [
31,
31,
32,
31,
31,
30,
30,
30,
30,
30,
30,
30
],
"totalDays": 366,
"source": "Jantri-Nanakshahi-557.pdf (extracted 2024-12-19)",
"validatedBy": "official_sgpc",
"corrections": {
"july_5": "miri_piri_divas",
"jeth_length": 32
},
"notes": "Official SGPC calendar data - Jeth has 32 days",
"officialData": {
"months": [
{
"name": "Chet",
"punjabi": "ਚੇਤ",
"days": 31,
"startDate": "2025-03-20"
},
{
"name": "Vaisakh",
"punjabi": "ਵੈਸਾਖ",
"days": 31,
"startDate": "2025-04-20"
},
{
"name": "Jeth",
"punjabi": "ਜੇਠ",
"days": 32,
"startDate": "2025-05-21"
},
{
"name": "Harh",
"punjabi": "ਹਾੜ",
"days": 31,
"startDate": "2025-06-22"
},
{
"name": "Sawan",
"punjabi": "ਸਾਵਣ",
"days": 31,
"startDate": "2025-07-23"
},
{
"name": "Bhadon",
"punjabi": "ਭਾਦੋਂ",
"days": 30,
"startDate": "2025-08-23"
},
{
"name": "Assu",
"punjabi": "ਅੱਸੂ",
"days": 30,
"startDate": "2025-09-22"
},
{
"name": "Kattak",
"punjabi": "ਕੱਤਕ",
"days": 30,
"startDate": "2025-10-22"
},
{
"name": "Maghar",
"punjabi": "ਮੱਘਰ",
"days": 30,
"startDate": "2025-11-21"
},
{
"name": "Poh",
"punjabi": "ਪੋਹ",
"days": 30,
"startDate": "2025-12-21"
},
{
"name": "Magh",
"punjabi": "ਮਾਘ",
"days": 30,
"startDate": "2026-01-20"
},
{
"name": "Phagan",
"punjabi": "ਫੱਗਣ",
"days": 30,
"startDate": "2026-02-19"
}
],
"gurpurabs": [
{
"name": "Parkash Guru Nanak Dev Ji",
"nanakshahiDate": {
"month": 8,
"day": 23
},
"gregorianDate": "2024-11-15",
"type": "gurpurab",
"movable": true
},
{
"name": "Miri Piri Divas",
"nanakshahiDate": {
"month": 4,
"day": 22
},
"gregorianDate": "2025-07-05",
"type": "gurpurab",
"movable": false,
"note": "Corrected from Parkash Divas"
},
{
"name": "Shaheedi Guru Arjan Dev Ji",
"nanakshahiDate": {
"month": 3,
"day": 16
},
"gregorianDate": "2025-06-06",
"type": "shaheedi",
"movable": false
},
{
"name": "Parkash Guru Hargobind Sahib Ji",
"nanakshahiDate": {
"month": 4,
"day": 21
},
"gregorianDate": "2025-07-04",
"type": "gurpurab",
"movable": false
},
{
"name": "Bandi Chhorr Divas",
"nanakshahiDate": {
"month": 8,
"day": 8
},
"gregorianDate": "2024-10-20",
"type": "historical",
"movable": true
}
],
"validation": {
"totalDays": 366,
"leapMonth": "Jeth",
"leapDays": 32,
"startDate": "2025-03-20",
"endDate": "2026-03-19"
}
}
},
"558": {
"gregorianYear": 2026,
"monthLengths": [
31,
31,
31,
31,
31,
30,
30,
30,
30,
30,
30,
30
],
"totalDays": 365,
"source": "projected_from_pattern",
"validatedBy": "pending",
"corrections": {
"july_5": "miri_piri_divas"
},
"notes": "Predicted based on historical patterns - needs SGPC verification"
},
"559": {
"gregorianYear": 2027,
"monthLengths": [
31,
31,
31,
31,
31,
30,
30,
30,
30,
30,
30,
30
],
"totalDays": 365,
"source": "projected_from_pattern",
"validatedBy": "pending",
"corrections": {
"july_5": "miri_piri_divas"
},
"notes": "Predicted based on historical patterns - needs SGPC verification"
},
"560": {
"gregorianYear": 2028,
"monthLengths": [
31,
31,
31,
31,
31,
30,
30,
30,
30,
30,
30,
30
],
"totalDays": 365,
"source": "projected_from_pattern",
"validatedBy": "pending",
"corrections": {
"july_5": "miri_piri_divas"
},
"notes": "Predicted based on historical patterns - needs SGPC verification"
},
"561": {
"gregorianYear": 2029,
"monthLengths": [
31,
31,
32,
31,
31,
30,
30,
30,
30,
30,
30,
30
],
"totalDays": 366,
"source": "projected_from_pattern",
"validatedBy": "pending",
"corrections": {
"july_5": "miri_piri_divas",
"jeth_length": 32
},
"notes": "Predicted leap year pattern - Jeth may have 32 days (needs SGPC verification)"
}
},
"movableGurpurabs": {
"description": "Movable Gurpurabs based on lunar calendar calculations",
"source": "Historical analysis and community contributions",
"gurpurabs": {
"gurunanak": {
"description": "Parkash Guru Nanak Dev Ji",
"type": "gurpurab",
"calculation": "kartik_purnima",
"dates": {
"2024": {
"month": 11,
"day": 15
},
"2025": {
"month": 11,
"day": 5
},
"2026": {
"month": 11,
"day": 24
},
"2027": {
"month": 11,
"day": 13
},
"2028": {
"month": 11,
"day": 2
},
"2029": {
"month": 11,
"day": 21
}
}
},
"bandichhorr": {
"description": "Bandi Chhorr Divas (Diwali)",
"type": "historical",
"calculation": "diwali_amavasya",
"dates": {
"2024": {
"month": 11,
"day": 1
},
"2025": {
"month": 10,
"day": 20
},
"2026": {
"month": 11,
"day": 8
},
"2027": {
"month": 10,
"day": 29
},
"2028": {
"month": 10,
"day": 17
},
"2029": {
"month": 11,
"day": 5
}
}
},
"holla": {
"description": "Holla Mohalla",
"type": "historical",
"calculation": "holi_plus_one",
"dates": {
"2024": {
"month": 3,
"day": 25
},
"2025": {
"month": 3,
"day": 14
},
"2026": {
"month": 3,
"day": 3
},
"2027": {
"month": 3,
"day": 22
},
"2028": {
"month": 3,
"day": 11
},
"2029": {
"month": 3,
"day": 30
}
}
}
}
},
"validationRules": {
"monthLengths": {
"min": 28,
"max": 32,
"total": {
"min": 365,
"max": 366
}
},
"leapYearPattern": {
"description": "SGPC leap year pattern analysis",
"observedPattern": "Jeth extends to 32 days approximately every 4 years, but not consistently",
"knownLeapYears": [
557,
561
],
"needsVerification": true
}
},
"predictionModel": {
"description": "Pattern-based prediction for future years",
"confidence": "medium",
"rules": [
{
"rule": "july_5_correction",
"description": "July 5th should always be Miri Piri Divas",
"confidence": "high"
},
{
"rule": "jeth_leap_pattern",
"description": "Jeth extends to 32 days roughly every 4 years",
"confidence": "medium",
"note": "Requires SGPC confirmation"
},
{
"rule": "total_days_365_366",
"description": "Total days should be 365 or 366",
"confidence": "high"
}
]
},
"officialCalendarData": {
"description": "Official SGPC calendar data extracted from PDF sources",
"sources": {
"557": {
"source": "Jantri-Nanakshahi-557.pdf (extracted 2024-12-19)",
"extractedDate": "2024-12-19",
"gurpurabs": [
{
"name": "Parkash Guru Nanak Dev Ji",
"nanakshahiDate": {
"month": 8,
"day": 23
},
"gregorianDate": "2024-11-15",
"type": "gurpurab",
"movable": true
},
{
"name": "Miri Piri Divas",
"nanakshahiDate": {
"month": 4,
"day": 22
},
"gregorianDate": "2025-07-05",
"type": "gurpurab",
"movable": false,
"note": "Corrected from Parkash Divas"
},
{
"name": "Shaheedi Guru Arjan Dev Ji",
"nanakshahiDate": {
"month": 3,
"day": 16
},
"gregorianDate": "2025-06-06",
"type": "shaheedi",
"movable": false
},
{
"name": "Parkash Guru Hargobind Sahib Ji",
"nanakshahiDate": {
"month": 4,
"day": 21
},
"gregorianDate": "2025-07-04",
"type": "gurpurab",
"movable": false
},
{
"name": "Bandi Chhorr Divas",
"nanakshahiDate": {
"month": 8,
"day": 8
},
"gregorianDate": "2024-10-20",
"type": "historical",
"movable": true
}
],
"validation": {
"totalDays": 366,
"leapMonth": "Jeth",
"leapDays": 32,
"startDate": "2025-03-20",
"endDate": "2026-03-19"
}
}
},
"lastUpdated": "2025-07-06"
}
}